ceph/src/boost/libs/context/doc/html/context/abstract_context/econtext.html

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  25 <div class="section">
  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="context.abstract_context.econtext"></a><a class="link" href="econtext.html" title="Class execution_context">Class execution_context</a>
  28 </h3></div></div></div>
  29 <div class="important"><table border="0" summary="Important">
  30 <tr>
  31 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../../../../../doc/src/images/important.png"></td>
  32 <th align="left">Important</th>
  33 </tr>
  34 <tr><td align="left" valign="top"><p>
  35           <span class="emphasis"><em>execution_context</em></span> requires C++11!
  36         </p></td></tr>
  37 </table></div>
  38 <p>
  39         Class <span class="emphasis"><em>execution_context</em></span> encapsulates <span class="emphasis"><em>fcontext_t</em></span>
  40         and manages the context' stack (allocation/deallocation).
  41       </p>
  42 <p>
  43         <span class="emphasis"><em>execution_context</em></span> allocates the context stack (using
  44         its <span class="emphasis"><em>StackAllocator</em></span> argument) and creates a control structure
  45         on top of it. This structure controls the life time of the stack. Instances
  46         of <span class="emphasis"><em>execution_context</em></span>, associated with a specific context,
  47         share the ownership of the control structure. If the last reference goes
  48         out of scope, the control structure is destroyed and the stack gets deallocated
  49         via the <span class="emphasis"><em>StackAllocator</em></span>. <span class="emphasis"><em>execution_context</em></span>
  50         is copy-constructible, move-constructible, copy-assignable and move-assignable.
  51         <span class="emphasis"><em>execution_context</em></span> maintains a static, thread-local pointer
  52         (smart pointer), accessed by <span class="emphasis"><em>execution_context::current()</em></span>,
  53         pointing to the active context. On each context switch the static thread-local
  54         pointer is updated. The usage of this global pointer makes the context switch
  55         a little bit slower (due access of thread local storage) but has some advantages.
  56         It allows to access the control structure of the current active context from
  57         arbitrary code paths required in order to support segmented stacks, which
  58         need to call certain maintenance functions (__splitstack_getcontext etc.)
  59         before each context switch (each context switch exchanges the stack). Additionally
  60         the destruction of <span class="emphasis"><em>execution_context</em></span> and thus the stack
  61         deallocation is faster compared to <span class="emphasis"><em>captured_context</em></span>.
  62       </p>
  63 <p>
  64         <span class="emphasis"><em>execution_context</em></span> expects a function/functor with signature
  65         <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span>
  66         <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">vp</span><span class="special">)</span></code> (
  67         <code class="computeroutput"><span class="identifier">vp</span></code> is the data passed at
  68         the first invocation of <span class="emphasis"><em>execution_context::operator()</em></span>).
  69       </p>
  70 <h5>
  71 <a name="context.abstract_context.econtext.h0"></a>
  72         <span><a name="context.abstract_context.econtext.usage_of__emphasis_execution_context__emphasis_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext.usage_of__emphasis_execution_context__emphasis_">usage
  73         of <span class="emphasis"><em>execution_context</em></span></a>
  74       </h5>
  75 <pre class="programlisting"><span class="comment">/*
  76  * grammar:
  77  *   P ---&gt; E '\0'
  78  *   E ---&gt; T {('+'|'-') T}
  79  *   T ---&gt; S {('*'|'/') S}
  80  *   S ---&gt; digit | '(' E ')'
  81  */</span>
  82 <span class="keyword">class</span> <span class="identifier">Parser</span><span class="special">{</span>
  83     <span class="comment">// implementation omitted; see examples directory</span>
  84 <span class="special">};</span>
  85
  86 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span>
  87     <span class="identifier">std</span><span class="special">::</span><span class="identifier">istringstream</span> <span class="identifier">is</span><span class="special">(</span><span class="string">"1+1"</span><span class="special">);</span>
  88     <span class="keyword">bool</span> <span class="identifier">done</span><span class="special">=</span><span class="keyword">false</span><span class="special">;</span>
  89     <span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span> <span class="identifier">except</span><span class="special">;</span>
  90
  91     <span class="comment">// create handle to main execution context</span>
  92     <span class="keyword">auto</span> <span class="identifier">main_ctx</span><span class="special">(</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">context</span><span class="special">::</span><span class="identifier">execution_context</span><span class="special">::</span><span class="identifier">current</span><span class="special">()</span> <span class="special">);</span>
  93
  94     <span class="comment">// execute parser in new execution context</span>
  95     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">context</span><span class="special">::</span><span class="identifier">execution_context</span> <span class="identifier">parser_ctx</span><span class="special">(</span>
  96             <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_arg</span><span class="special">,</span>
  97             <span class="identifier">boost</span><span class="special">::</span><span class="identifier">context</span><span class="special">::</span><span class="identifier">fixedsize_stack</span><span class="special">(</span><span class="number">4096</span><span class="special">),</span>
  98             <span class="special">[&amp;</span><span class="identifier">main_ctx</span><span class="special">,&amp;</span><span class="identifier">is</span><span class="special">,&amp;</span><span class="identifier">done</span><span class="special">,&amp;</span><span class="identifier">except</span><span class="special">](</span><span class="keyword">void</span><span class="special">*){</span>
  99             <span class="comment">// create parser with callback function</span>
 100             <span class="identifier">Parser</span> <span class="identifier">p</span><span class="special">(</span> <span class="identifier">is</span><span class="special">,</span>
 101                       <span class="special">[&amp;</span><span class="identifier">main_ctx</span><span class="special">,&amp;</span><span class="identifier">c</span><span class="special">](</span><span class="keyword">char</span> <span class="identifier">ch</span><span class="special">){</span>
 102                             <span class="comment">// resume main execution context</span>
 103                             <span class="identifier">main_ctx</span><span class="special">(</span> <span class="special">&amp;</span> <span class="identifier">ch</span><span class="special">);</span>
 104                     <span class="special">});</span>
 105                 <span class="keyword">try</span> <span class="special">{</span>
 106                     <span class="comment">// start recursive parsing</span>
 107                     <span class="identifier">p</span><span class="special">.</span><span class="identifier">run</span><span class="special">();</span>
 108                 <span class="special">}</span> <span class="keyword">catch</span> <span class="special">(</span> <span class="special">...</span> <span class="special">)</span> <span class="special">{</span>
 109                     <span class="comment">// store other exceptions in exception-pointer</span>
 110                     <span class="identifier">except</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">current_exception</span><span class="special">();</span>
 111                 <span class="special">}</span>
 112                 <span class="comment">// set termination flag</span>
 113                 <span class="identifier">done</span><span class="special">=</span><span class="keyword">true</span><span class="special">;</span>
 114                 <span class="comment">// resume main execution context</span>
 115                 <span class="identifier">main_ctx</span><span class="special">();</span>
 116             <span class="special">});</span>
 117
 118     <span class="comment">// user-code pulls parsed data from parser</span>
 119     <span class="comment">// invert control flow</span>
 120     <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">vp</span> <span class="special">=</span> <span class="identifier">parser_ctx</span><span class="special">();</span>
 121     <span class="keyword">if</span> <span class="special">(</span> <span class="identifier">except</span><span class="special">)</span> <span class="special">{</span>
 122         <span class="identifier">std</span><span class="special">::</span><span class="identifier">rethrow_exception</span><span class="special">(</span> <span class="identifier">except</span><span class="special">);</span>
 123     <span class="special">}</span>
 124     <span class="keyword">while</span><span class="special">(</span> <span class="special">!</span> <span class="identifier">done</span><span class="special">)</span> <span class="special">{</span>
 125         <span class="identifier">printf</span><span class="special">(</span><span class="string">"Parsed: %c\n"</span><span class="special">,*</span> <span class="keyword">static_cast</span><span class="special">&lt;</span> <span class="keyword">char</span><span class="special">*</span> <span class="special">&gt;(</span> <span class="identifier">vp</span><span class="special">)</span> <span class="special">);</span>
 126         <span class="identifier">parser_ctx</span><span class="special">();</span>
 127         <span class="keyword">if</span> <span class="special">(</span> <span class="identifier">except</span><span class="special">)</span> <span class="special">{</span>
 128             <span class="identifier">std</span><span class="special">::</span><span class="identifier">rethrow_exception</span><span class="special">(</span> <span class="identifier">except</span><span class="special">);</span>
 129         <span class="special">}</span>
 130     <span class="special">}</span>
 131
 132     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"main: done"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
 133 <span class="special">}</span>
 134
 135 <span class="identifier">output</span><span class="special">:</span>
 136     <span class="identifier">Parsed</span><span class="special">:</span> <span class="number">1</span>
 137     <span class="identifier">Parsed</span><span class="special">:</span> <span class="special">+</span>
 138     <span class="identifier">Parsed</span><span class="special">:</span> <span class="number">1</span>
 139 </pre>
 140 <p>
 141         In this example a recursive descent parser uses a callback to emit a newly
 142         passed symbol. Using <span class="emphasis"><em>execution_context</em></span> the control flow
 143         can be inverted, e.g. the user-code pulls parsed symbols from the parser
 144         - instead to get pushed from the parser (via callback).
 145       </p>
 146 <p>
 147         The data (character) is transferred between the two <span class="emphasis"><em>execution_context</em></span>.
 148       </p>
 149 <p>
 150         If the code executed by <span class="emphasis"><em>execution_context</em></span> emits an exception,
 151         the application is terminated. <span class="emphasis"><em>std::exception_ptr</em></span> can
 152         be used to transfer exceptions between different execution contexts.
 153       </p>
 154 <p>
 155         Sometimes it is necessary to unwind the stack of an unfinished context to
 156         destroy local stack variables so they can release allocated resources (RAII
 157         pattern). The user is responsible for this task.
 158       </p>
 159 <h5>
 160 <a name="context.abstract_context.econtext.h1"></a>
 161         <span><a name="context.abstract_context.econtext.allocating_control_structures_on_top_of_stack"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext.allocating_control_structures_on_top_of_stack">allocating
 162         control structures on top of stack</a>
 163       </h5>
 164 <p>
 165         Allocating control structures on top of the stack requires to allocated the
 166         <span class="emphasis"><em>stack_context</em></span> and create the control structure with
 167         placement new before <span class="emphasis"><em>execution_context</em></span> is created.
 168       </p>
 169 <div class="note"><table border="0" summary="Note">
 170 <tr>
 171 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
 172 <th align="left">Note</th>
 173 </tr>
 174 <tr><td align="left" valign="top"><p>
 175           The user is responsible for destructing the control structure at the top
 176           of the stack.
 177         </p></td></tr>
 178 </table></div>
 179 <pre class="programlisting"><span class="comment">// stack-allocator used for (de-)allocating stack</span>
 180 <span class="identifier">fixedsize_stack</span> <span class="identifier">salloc</span><span class="special">(</span> <span class="number">4048</span><span class="special">);</span>
 181 <span class="comment">// allocate stack space</span>
 182 <span class="identifier">stack_context</span> <span class="identifier">sctx</span><span class="special">(</span> <span class="identifier">salloc</span><span class="special">.</span><span class="identifier">allocate</span><span class="special">()</span> <span class="special">);</span>
 183 <span class="comment">// reserve space for control structure on top of the stack</span>
 184 <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">sp</span> <span class="special">=</span> <span class="keyword">static_cast</span><span class="special">&lt;</span> <span class="keyword">char</span> <span class="special">*</span> <span class="special">&gt;(</span> <span class="identifier">sctx</span><span class="special">.</span><span class="identifier">sp</span><span class="special">)</span> <span class="special">-</span> <span class="keyword">sizeof</span><span class="special">(</span> <span class="identifier">my_control_structure</span><span class="special">);</span>
 185 <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">size</span> <span class="special">=</span> <span class="identifier">sctx</span><span class="special">.</span><span class="identifier">size</span> <span class="special">-</span> <span class="keyword">sizeof</span><span class="special">(</span> <span class="identifier">my_control_structure</span><span class="special">);</span>
 186 <span class="comment">// placement new creates control structure on reserved space</span>
 187 <span class="identifier">my_control_structure</span> <span class="special">*</span> <span class="identifier">cs</span> <span class="special">=</span> <span class="keyword">new</span> <span class="special">(</span> <span class="identifier">sp</span><span class="special">)</span> <span class="identifier">my_control_structure</span><span class="special">(</span> <span class="identifier">sp</span><span class="special">,</span> <span class="identifier">size</span><span class="special">,</span> <span class="identifier">sctx</span><span class="special">,</span> <span class="identifier">salloc</span><span class="special">);</span>
 188 <span class="special">...</span>
 189 <span class="comment">// destructing the control structure</span>
 190 <span class="identifier">cs</span><span class="special">-&gt;~</span><span class="identifier">my_control_structure</span><span class="special">();</span>
 191 <span class="special">...</span>
 192 <span class="keyword">struct</span> <span class="identifier">my_control_structure</span>  <span class="special">{</span>
 193     <span class="comment">// execution context</span>
 194     <span class="identifier">execution_context</span> <span class="identifier">ectx</span><span class="special">;</span>
 195
 196     <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">StackAllocator</span> <span class="special">&gt;</span>
 197     <span class="identifier">my_control_structure</span><span class="special">(</span> <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">sp</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">,</span> <span class="identifier">stack_context</span> <span class="identifier">sctx</span><span class="special">,</span> <span class="identifier">StackAllocator</span> <span class="identifier">salloc</span><span class="special">)</span> <span class="special">:</span>
 198         <span class="comment">// create execution context</span>
 199         <span class="identifier">ectx</span><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_arg</span><span class="special">,</span> <span class="identifier">preallocated</span><span class="special">(</span> <span class="identifier">sp</span><span class="special">,</span> <span class="identifier">size</span><span class="special">,</span> <span class="identifier">sctx</span><span class="special">),</span> <span class="identifier">salloc</span><span class="special">,</span> <span class="identifier">entry_func</span><span class="special">)</span> <span class="special">{</span>
 200     <span class="special">}</span>
 201     <span class="special">...</span>
 202 <span class="special">};</span>
 203 </pre>
 204 <h5>
 205 <a name="context.abstract_context.econtext.h2"></a>
 206         <span><a name="context.abstract_context.econtext.exception_handling"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext.exception_handling">exception
 207         handling</a>
 208       </h5>
 209 <p>
 210         If the function executed inside a <span class="emphasis"><em>execution_context</em></span>
 211         emits ans exception, the application is terminated by calling ['std::terminate().
 212         <span class="emphasis"><em>std::exception_ptr</em></span> can be used to transfer exceptions
 213         between different execution contexts.
 214       </p>
 215 <h5>
 216 <a name="context.abstract_context.econtext.h3"></a>
 217         <span><a name="context.abstract_context.econtext.parameter_passing"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext.parameter_passing">parameter
 218         passing</a>
 219       </h5>
 220 <p>
 221         The void pointer argument passed to <span class="emphasis"><em>execution_context::operator()</em></span>,
 222         in one context, is passed as the last argument of the <span class="emphasis"><em>context-function</em></span>
 223         if the context is started for the first time. In all following invocations
 224         of <span class="emphasis"><em>execution_context::operator()</em></span> the void pointer passed
 225         to <span class="emphasis"><em>execution_context::operator()</em></span>, in one context, is
 226         returned by <span class="emphasis"><em>execution_context::operator()</em></span> in the other
 227         context.
 228       </p>
 229 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">X</span> <span class="special">{</span>
 230 <span class="keyword">private</span><span class="special">:</span>
 231     <span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span> <span class="identifier">excptr_</span><span class="special">;</span>
 232     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">context</span><span class="special">::</span><span class="identifier">execution_context</span> <span class="identifier">caller_</span><span class="special">;</span>
 233     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">context</span><span class="special">::</span><span class="identifier">execution_context</span> <span class="identifier">callee_</span><span class="special">;</span>
 234
 235 <span class="keyword">public</span><span class="special">:</span>
 236     <span class="identifier">X</span><span class="special">()</span> <span class="special">:</span>
 237         <span class="identifier">excptr_</span><span class="special">(),</span>
 238         <span class="identifier">caller_</span><span class="special">(</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">context</span><span class="special">::</span><span class="identifier">execution_context</span><span class="special">::</span><span class="identifier">current</span><span class="special">()</span> <span class="special">),</span>
 239         <span class="identifier">callee_</span><span class="special">(</span> <span class="special">[=]</span> <span class="special">(</span><span class="keyword">void</span> <span class="special">*</span> <span class="identifier">vp</span><span class="special">)</span> <span class="special">{</span>
 240                     <span class="keyword">try</span> <span class="special">{</span>
 241                         <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="special">*</span> <span class="keyword">static_cast</span><span class="special">&lt;</span> <span class="keyword">int</span> <span class="special">*</span> <span class="special">&gt;(</span> <span class="identifier">vp</span><span class="special">);</span>
 242                         <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">str</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">lexical_cast</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;(</span><span class="identifier">i</span><span class="special">);</span>
 243                         <span class="identifier">caller_</span><span class="special">(</span> <span class="special">&amp;</span> <span class="identifier">str</span><span class="special">);</span>
 244                     <span class="special">}</span> <span class="keyword">catch</span> <span class="special">(...)</span> <span class="special">{</span>
 245                         <span class="identifier">excptr_</span><span class="special">=</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">current_exception</span><span class="special">();</span>
 246                     <span class="special">}</span>
 247                  <span class="special">})</span>
 248     <span class="special">{}</span>
 249
 250     <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span> <span class="keyword">int</span> <span class="identifier">i</span><span class="special">)</span> <span class="special">{</span>
 251         <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">ret</span> <span class="special">=</span> <span class="identifier">callee_</span><span class="special">(</span> <span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
 252         <span class="keyword">if</span><span class="special">(</span><span class="identifier">excptr_</span><span class="special">){</span>
 253             <span class="identifier">std</span><span class="special">::</span><span class="identifier">rethrow_exception</span><span class="special">(</span><span class="identifier">excptr_</span><span class="special">);</span>
 254         <span class="special">}</span>
 255         <span class="keyword">return</span> <span class="special">*</span> <span class="keyword">static_cast</span><span class="special">&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">*</span> <span class="special">&gt;(</span> <span class="identifier">ret</span><span class="special">);</span>
 256     <span class="special">}</span>
 257 <span class="special">};</span>
 258
 259 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span>
 260     <span class="identifier">X</span> <span class="identifier">x</span><span class="special">;</span>
 261     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">x</span><span class="special">(</span> <span class="number">7</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
 262     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"done"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
 263 <span class="special">}</span>
 264 </pre>
 265 <h5>
 266 <a name="context.abstract_context.econtext.h4"></a>
 267         <span><a name="context.abstract_context.econtext.class__code__phrase_role__identifier__execution_context__phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext.class__code__phrase_role__identifier__execution_context__phrase___code_">Class
 268         <code class="computeroutput"><span class="identifier">execution_context</span></code></a>
 269       </h5>
 270 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">execution_context</span> <span class="special">{</span>
 271 <span class="keyword">public</span><span class="special">:</span>
 272     <span class="keyword">static</span> <span class="identifier">execution_context</span> <span class="identifier">current</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span>
 273
 274     <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> <span class="identifier">Args</span> <span class="special">&gt;</span>
 275     <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span>
 276
 277     <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">StackAlloc</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> <span class="identifier">Args</span> <span class="special">&gt;</span>
 278     <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_arg_t</span><span class="special">,</span> <span class="identifier">StackAlloc</span> <span class="identifier">salloc</span><span class="special">,</span> <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span>
 279
 280     <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">StackAlloc</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> <span class="identifier">Args</span> <span class="special">&gt;</span>
 281     <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_arg_t</span><span class="special">,</span> <span class="identifier">preallocated</span> <span class="identifier">palloc</span><span class="special">,</span> <span class="identifier">StackAlloc</span> <span class="identifier">salloc</span><span class="special">,</span> <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span>
 282
 283     <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
 284     <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">execution_context</span> <span class="special">&amp;&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
 285
 286     <span class="identifier">execution_context</span> <span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">=(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
 287     <span class="identifier">execution_context</span> <span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">=(</span> <span class="identifier">execution_context</span> <span class="special">&amp;&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
 288
 289     <span class="keyword">explicit</span> <span class="keyword">operator</span> <span class="keyword">bool</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 290     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 291
 292     <span class="keyword">void</span> <span class="special">*</span> <span class="keyword">operator</span><span class="special">()(</span> <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">vp</span> <span class="special">=</span> <span class="keyword">nullptr</span><span class="special">);</span>
 293
 294     <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> <span class="identifier">Args</span> <span class="special">&gt;</span>
 295     <span class="keyword">void</span> <span class="special">*</span> <span class="keyword">operator</span><span class="special">()(</span> <span class="identifier">exec_ontop_arg_t</span><span class="special">,</span> <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span>
 296
 297     <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> <span class="identifier">Args</span> <span class="special">&gt;</span>
 298     <span class="keyword">void</span> <span class="special">*</span> <span class="keyword">operator</span><span class="special">()(</span> <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">vp</span><span class="special">,</span> <span class="identifier">exec_ontop_arg_t</span><span class="special">,</span> <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span>
 299
 300     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 301
 302     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 303
 304     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 305
 306     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 307
 308     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;=(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 309
 310     <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;=(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 311
 312     <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traitsT</span> <span class="special">&gt;</span>
 313     <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
 314     <span class="keyword">operator</span><span class="special">&lt;&lt;(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">);</span>
 315 <span class="special">};</span>
 316 </pre>
 317 <h5>
 318 <a name="context.abstract_context.econtext.h5"></a>
 319         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__static__phrase___phrase_role__identifier__execution_context__phrase___phrase_role__identifier__current__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__static__phrase___phrase_role__identifier__execution_context__phrase___phrase_role__identifier__current__phrase__phrase_role__special______phrase___code_"><code class="computeroutput"><span class="keyword">static</span> <span class="identifier">execution_context</span>
 320         <span class="identifier">current</span><span class="special">()</span></code></a>
 321       </h5>
 322 <div class="variablelist">
 323 <p class="title"><b></b></p>
 324 <dl>
 325 <dt><span class="term">Returns:</span></dt>
 326 <dd><p>
 327               Returns an instance of excution_context pointing to the active execution
 328               context.
 329             </p></dd>
 330 <dt><span class="term">Throws:</span></dt>
 331 <dd><p>
 332               Nothing.
 333             </p></dd>
 334 </dl>
 335 </div>
 336 <h5>
 337 <a name="context.abstract_context.econtext.h6"></a>
 338         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__template__phrase__phrase_role__special___lt___phrase___phrase_role__identifier__typname__phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__keyword__typename__phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase___phrase_role__special___gt___phrase___phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__fn__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__identifier__args__phrase___phrase_role__special___amp__amp___phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__template__phrase__phrase_role__special___lt___phrase___phrase_role__identifier__typname__phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__keyword__typename__phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase___phrase_role__special___gt___phrase___phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__fn__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__identifier__args__phrase___phrase_role__special___amp__amp___phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span> <span class="identifier">typname</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> <span class="identifier">Args</span> <span class="special">&gt;</span> <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span>
 339         <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span>
 340         <span class="special">...</span> <span class="identifier">args</span><span class="special">)</span></code></a>
 341       </h5>
 342 <div class="variablelist">
 343 <p class="title"><b></b></p>
 344 <dl>
 345 <dt><span class="term">Effects:</span></dt>
 346 <dd><p>
 347               Creates a new execution context and prepares the context to execute
 348               <code class="computeroutput"><span class="identifier">fn</span></code>. <code class="computeroutput"><span class="identifier">fixedsize_stack</span></code>
 349               is used as default stack allocator (stack size == fixedsize_stack::traits::default_size().
 350             </p></dd>
 351 </dl>
 352 </div>
 353 <h5>
 354 <a name="context.abstract_context.econtext.h7"></a>
 355         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__template__phrase__phrase_role__special___lt___phrase___phrase_role__keyword__typename__phrase___phrase_role__identifier__stackalloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__typname__phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__keyword__typename__phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase___phrase_role__special___gt___phrase___phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__allocator_arg_t__phrase__phrase_role__special_____phrase___phrase_role__identifier__stackalloc__phrase___phrase_role__identifier__salloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__fn__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__identifier__args__phrase___phrase_role__special___amp__amp___phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__template__phrase__phrase_role__special___lt___phrase___phrase_role__keyword__typename__phrase___phrase_role__identifier__stackalloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__typname__phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__keyword__typename__phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase___phrase_role__special___gt___phrase___phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__allocator_arg_t__phrase__phrase_role__special_____phrase___phrase_role__identifier__stackalloc__phrase___phrase_role__identifier__salloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__fn__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__identifier__args__phrase___phrase_role__special___amp__amp___phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">StackAlloc</span><span class="special">,</span> <span class="identifier">typname</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span>
 356         <span class="special">...</span> <span class="identifier">Args</span>
 357         <span class="special">&gt;</span> <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_arg_t</span><span class="special">,</span>
 358         <span class="identifier">StackAlloc</span> <span class="identifier">salloc</span><span class="special">,</span> <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span>
 359         <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span>
 360         <span class="special">...</span> <span class="identifier">args</span><span class="special">)</span></code></a>
 361       </h5>
 362 <div class="variablelist">
 363 <p class="title"><b></b></p>
 364 <dl>
 365 <dt><span class="term">Effects:</span></dt>
 366 <dd><p>
 367               Creates a new execution context and prepares the context to execute
 368               <code class="computeroutput"><span class="identifier">fn</span></code>.
 369             </p></dd>
 370 </dl>
 371 </div>
 372 <h5>
 373 <a name="context.abstract_context.econtext.h8"></a>
 374         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__template__phrase__phrase_role__special___lt___phrase___phrase_role__keyword__typename__phrase___phrase_role__identifier__stackalloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__typname__phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__keyword__typename__phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase___phrase_role__special___gt___phrase___phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__allocator_arg_t__phrase__phrase_role__special_____phrase___phrase_role__identifier__preallocated__phrase___phrase_role__identifier__palloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__stackalloc__phrase___phrase_role__identifier__salloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__fn__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__identifier__args__phrase___phrase_role__special___amp__amp___phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__template__phrase__phrase_role__special___lt___phrase___phrase_role__keyword__typename__phrase___phrase_role__identifier__stackalloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__typname__phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__keyword__typename__phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase___phrase_role__special___gt___phrase___phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__allocator_arg_t__phrase__phrase_role__special_____phrase___phrase_role__identifier__preallocated__phrase___phrase_role__identifier__palloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__stackalloc__phrase___phrase_role__identifier__salloc__phrase__phrase_role__special_____phrase___phrase_role__identifier__fn__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__fn__phrase__phrase_role__special_____phrase___phrase_role__identifier__args__phrase___phrase_role__special___amp__amp___phrase___phrase_role__special_______phrase___phrase_role__identifier__args__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">StackAlloc</span><span class="special">,</span> <span class="identifier">typname</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span>
 375         <span class="special">...</span> <span class="identifier">Args</span>
 376         <span class="special">&gt;</span> <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator_arg_t</span><span class="special">,</span>
 377         <span class="identifier">preallocated</span> <span class="identifier">palloc</span><span class="special">,</span> <span class="identifier">StackAlloc</span>
 378         <span class="identifier">salloc</span><span class="special">,</span>
 379         <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span>
 380         <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span>
 381         <span class="special">...</span> <span class="identifier">args</span><span class="special">)</span></code></a>
 382       </h5>
 383 <div class="variablelist">
 384 <p class="title"><b></b></p>
 385 <dl>
 386 <dt><span class="term">Effects:</span></dt>
 387 <dd><p>
 388               Creates a new execution context and prepares the context to execute
 389               <code class="computeroutput"><span class="identifier">fn</span></code>. Used to store control
 390               structures on top of the stack.
 391             </p></dd>
 392 </dl>
 393 </div>
 394 <h5>
 395 <a name="context.abstract_context.econtext.h9"></a>
 396         <span><a name="context.abstract_context.econtext._code__phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__execution_context__phrase___phrase_role__keyword__const__phrase__phrase_role__special___amp___phrase___phrase_role__identifier__other__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__execution_context__phrase___phrase_role__keyword__const__phrase__phrase_role__special___amp___phrase___phrase_role__identifier__other__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="identifier">execution_context</span><span class="special">(</span>
 397         <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span></code></a>
 398       </h5>
 399 <div class="variablelist">
 400 <p class="title"><b></b></p>
 401 <dl>
 402 <dt><span class="term">Effects:</span></dt>
 403 <dd><p>
 404               Copies <code class="computeroutput"><span class="identifier">other</span></code>, e.g.
 405               underlying capture record is shared with <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 406             </p></dd>
 407 <dt><span class="term">Throws:</span></dt>
 408 <dd><p>
 409               Nothing.
 410             </p></dd>
 411 </dl>
 412 </div>
 413 <h5>
 414 <a name="context.abstract_context.econtext.h10"></a>
 415         <span><a name="context.abstract_context.econtext._code__phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__execution_context__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__other__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__identifier__execution_context__phrase__phrase_role__special_____phrase___phrase_role__identifier__execution_context__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__other__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="identifier">execution_context</span><span class="special">(</span>
 416         <span class="identifier">execution_context</span> <span class="special">&amp;&amp;</span>
 417         <span class="identifier">other</span><span class="special">)</span></code></a>
 418       </h5>
 419 <div class="variablelist">
 420 <p class="title"><b></b></p>
 421 <dl>
 422 <dt><span class="term">Effects:</span></dt>
 423 <dd><p>
 424               Moves underlying capture record to <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
 425             </p></dd>
 426 <dt><span class="term">Throws:</span></dt>
 427 <dd><p>
 428               Nothing.
 429             </p></dd>
 430 </dl>
 431 </div>
 432 <h5>
 433 <a name="context.abstract_context.econtext.h11"></a>
 434         <span><a name="context.abstract_context.econtext._code__phrase_role__identifier__execution_context__phrase___phrase_role__special___amp___phrase___phrase_role__keyword__operator__phrase__phrase_role__special______phrase___phrase_role__identifier__execution_context__phrase___phrase_role__keyword__const__phrase__phrase_role__special___amp___phrase___phrase_role__identifier__other__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__identifier__execution_context__phrase___phrase_role__special___amp___phrase___phrase_role__keyword__operator__phrase__phrase_role__special______phrase___phrase_role__identifier__execution_context__phrase___phrase_role__keyword__const__phrase__phrase_role__special___amp___phrase___phrase_role__identifier__other__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="identifier">execution_context</span> <span class="special">&amp;</span>
 435         <span class="keyword">operator</span><span class="special">=(</span>
 436         <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span></code></a>
 437       </h5>
 438 <div class="variablelist">
 439 <p class="title"><b></b></p>
 440 <dl>
 441 <dt><span class="term">Effects:</span></dt>
 442 <dd><p>
 443               Copies the state of <code class="computeroutput"><span class="identifier">other</span></code>
 444               to <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>,
 445               state (capture record) is shared.
 446             </p></dd>
 447 <dt><span class="term">Throws:</span></dt>
 448 <dd><p>
 449               Nothing.
 450             </p></dd>
 451 </dl>
 452 </div>
 453 <h5>
 454 <a name="context.abstract_context.econtext.h12"></a>
 455         <span><a name="context.abstract_context.econtext._code__phrase_role__identifier__execution_context__phrase___phrase_role__special___amp___phrase___phrase_role__keyword__operator__phrase__phrase_role__special______phrase___phrase_role__identifier__execution_context__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__other__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__identifier__execution_context__phrase___phrase_role__special___amp___phrase___phrase_role__keyword__operator__phrase__phrase_role__special______phrase___phrase_role__identifier__execution_context__phrase___phrase_role__special___amp__amp___phrase___phrase_role__identifier__other__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="identifier">execution_context</span> <span class="special">&amp;</span>
 456         <span class="keyword">operator</span><span class="special">=(</span>
 457         <span class="identifier">execution_context</span> <span class="special">&amp;&amp;</span>
 458         <span class="identifier">other</span><span class="special">)</span></code></a>
 459       </h5>
 460 <div class="variablelist">
 461 <p class="title"><b></b></p>
 462 <dl>
 463 <dt><span class="term">Effects:</span></dt>
 464 <dd><p>
 465               Moves the state of <code class="computeroutput"><span class="identifier">other</span></code>
 466               to <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>
 467               using move semantics.
 468             </p></dd>
 469 <dt><span class="term">Throws:</span></dt>
 470 <dd><p>
 471               Nothing.
 472             </p></dd>
 473 </dl>
 474 </div>
 475 <h5>
 476 <a name="context.abstract_context.econtext.h13"></a>
 477         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__explicit__phrase___phrase_role__keyword__operator__phrase___phrase_role__keyword__bool__phrase__phrase_role__special______phrase___phrase_role__keyword__const__phrase___phrase_role__keyword__noexcept__phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__explicit__phrase___phrase_role__keyword__operator__phrase___phrase_role__keyword__bool__phrase__phrase_role__special______phrase___phrase_role__keyword__const__phrase___phrase_role__keyword__noexcept__phrase___code_"><code class="computeroutput"><span class="keyword">explicit</span> <span class="keyword">operator</span>
 478         <span class="keyword">bool</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span></code></a>
 479       </h5>
 480 <div class="variablelist">
 481 <p class="title"><b></b></p>
 482 <dl>
 483 <dt><span class="term">Returns:</span></dt>
 484 <dd><p>
 485               <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>
 486               points to a capture record.
 487             </p></dd>
 488 <dt><span class="term">Throws:</span></dt>
 489 <dd><p>
 490               Nothing.
 491             </p></dd>
 492 </dl>
 493 </div>
 494 <h5>
 495 <a name="context.abstract_context.econtext.h14"></a>
 496         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__bool__phrase___phrase_role__keyword__operator__phrase__phrase_role__special_______phrase___phrase_role__keyword__const__phrase___phrase_role__keyword__noexcept__phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__bool__phrase___phrase_role__keyword__operator__phrase__phrase_role__special_______phrase___phrase_role__keyword__const__phrase___phrase_role__keyword__noexcept__phrase___code_"><code class="computeroutput"><span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span></code></a>
 497       </h5>
 498 <div class="variablelist">
 499 <p class="title"><b></b></p>
 500 <dl>
 501 <dt><span class="term">Returns:</span></dt>
 502 <dd><p>
 503               <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>
 504               does not point to a capture record.
 505             </p></dd>
 506 <dt><span class="term">Throws:</span></dt>
 507 <dd><p>
 508               Nothing.
 509             </p></dd>
 510 </dl>
 511 </div>
 512 <h5>
 513 <a name="context.abstract_context.econtext.h15"></a>
 514         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__void__phrase___phrase_role__special_____phrase___phrase_role__keyword__operator__phrase__phrase_role__special_______phrase___phrase_role__keyword__void__phrase___phrase_role__special_____phrase___phrase_role__identifier__vp__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__void__phrase___phrase_role__special_____phrase___phrase_role__keyword__operator__phrase__phrase_role__special_______phrase___phrase_role__keyword__void__phrase___phrase_role__special_____phrase___phrase_role__identifier__vp__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="keyword">void</span> <span class="special">*</span> <span class="keyword">operator</span><span class="special">()(</span> <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">vp</span><span class="special">)</span></code></a>
 515       </h5>
 516 <pre class="programlisting"><span class="keyword">void</span> <span class="special">*</span> <span class="keyword">operator</span><span class="special">()(</span> <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">vp</span> <span class="special">=</span> <span class="keyword">nullptr</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
 517
 518 <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> <span class="identifier">Args</span> <span class="special">&gt;</span>
 519 <span class="keyword">void</span> <span class="special">*</span> <span class="keyword">operator</span><span class="special">()(</span> <span class="identifier">exec_ontop_arg_t</span><span class="special">,</span> <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span>
 520
 521 <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">Fn</span><span class="special">,</span> <span class="keyword">typename</span> <span class="special">...</span> <span class="identifier">Args</span> <span class="special">&gt;</span>
 522 <span class="keyword">void</span> <span class="special">*</span> <span class="keyword">operator</span><span class="special">()(</span> <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">data</span><span class="special">,</span> <span class="identifier">exec_ontop_arg_t</span><span class="special">,</span> <span class="identifier">Fn</span> <span class="special">&amp;&amp;</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&amp;&amp;</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span>
 523 </pre>
 524 <div class="variablelist">
 525 <p class="title"><b></b></p>
 526 <dl>
 527 <dt><span class="term">Effects:</span></dt>
 528 <dd>
 529 <p>
 530               Stores internally the current context data (stack pointer, instruction
 531               pointer, and CPU registers) of the current active context and restores
 532               the context data from <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>, which implies jumping to <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>'s
 533               context. The void pointer argument, <code class="computeroutput"><span class="identifier">vp</span></code>,
 534               is passed to the current context to be returned by the most recent
 535               call to <code class="computeroutput"><span class="identifier">execution_context</span><span class="special">::</span><span class="keyword">operator</span><span class="special">()</span></code> in the same thread. <code class="computeroutput"><span class="identifier">fn</span></code> is executed with arguments <code class="computeroutput"><span class="identifier">args</span></code> on top of the stack of <code class="computeroutput"><span class="keyword">this</span></code>. [[Note:
 536             </p>
 537 <p>
 538               The behaviour is undefined if <code class="computeroutput"><span class="keyword">operator</span><span class="special">()()</span></code> is called while <code class="computeroutput"><span class="identifier">execution_context</span><span class="special">::</span><span class="identifier">current</span><span class="special">()</span></code> returns <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> (e.g. resuming an already running
 539               context). If the top-level context function returns, <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">exit</span><span class="special">()</span></code>
 540               is called.
 541             </p>
 542 </dd>
 543 <dt><span class="term">Returns:</span></dt>
 544 <dd><p>
 545               The void pointer argument passed to the most recent call to <code class="computeroutput"><span class="identifier">execution_context</span><span class="special">::</span><span class="keyword">operator</span><span class="special">()</span></code>,
 546               if any.
 547             </p></dd>
 548 </dl>
 549 </div>
 550 <h5>
 551 <a name="context.abstract_context.econtext.h16"></a>
 552         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special______phrase___code_"><code class="computeroutput"><span class="keyword">operator</span><span class="special">==</span></code></a>
 553       </h5>
 554 <pre class="programlisting"><span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 555 </pre>
 556 <div class="variablelist">
 557 <p class="title"><b></b></p>
 558 <dl>
 559 <dt><span class="term">Returns:</span></dt>
 560 <dd><p>
 561               <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>
 562               and <code class="computeroutput"><span class="identifier">other</span></code> represent
 563               the same execution context, <code class="computeroutput"><span class="keyword">false</span></code>
 564               otherwise.
 565             </p></dd>
 566 <dt><span class="term">Throws:</span></dt>
 567 <dd><p>
 568               Nothing.
 569             </p></dd>
 570 </dl>
 571 </div>
 572 <h5>
 573 <a name="context.abstract_context.econtext.h17"></a>
 574         <span><a name="context.abstract_context.econtext.code_phrase_role_keyword_operat0"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext.code_phrase_role_keyword_operat0"><code class="computeroutput"><span class="keyword">operator</span><span class="special">!=</span></code></a>
 575       </h5>
 576 <pre class="programlisting"><span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 577 </pre>
 578 <div class="variablelist">
 579 <p class="title"><b></b></p>
 580 <dl>
 581 <dt><span class="term">Returns:</span></dt>
 582 <dd><p>
 583               [`! (other == * this)
 584             </p></dd>
 585 </dl>
 586 </div>
 587 <p>
 588         [[Throws:] [Nothing.]] ]
 589       </p>
 590 <h5>
 591 <a name="context.abstract_context.econtext.h18"></a>
 592         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___lt___phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___lt___phrase___code_"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;</span></code></a>
 593       </h5>
 594 <pre class="programlisting"><span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 595 </pre>
 596 <div class="variablelist">
 597 <p class="title"><b></b></p>
 598 <dl>
 599 <dt><span class="term">Returns:</span></dt>
 600 <dd><p>
 601               <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span> <span class="special">!=</span> <span class="identifier">other</span></code>
 602               is true and the implementation-defined total order of <code class="computeroutput"><span class="identifier">execution_context</span></code> values places
 603               <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>
 604               before <code class="computeroutput"><span class="identifier">other</span></code>, false
 605               otherwise.
 606             </p></dd>
 607 <dt><span class="term">Throws:</span></dt>
 608 <dd><p>
 609               Nothing.
 610             </p></dd>
 611 </dl>
 612 </div>
 613 <h5>
 614 <a name="context.abstract_context.econtext.h19"></a>
 615         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___gt___phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___gt___phrase___code_"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;</span></code></a>
 616       </h5>
 617 <pre class="programlisting"><span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 618 </pre>
 619 <div class="variablelist">
 620 <p class="title"><b></b></p>
 621 <dl>
 622 <dt><span class="term">Returns:</span></dt>
 623 <dd><p>
 624               <code class="computeroutput"><span class="identifier">other</span> <span class="special">&lt;</span>
 625               <span class="special">*</span> <span class="keyword">this</span></code>
 626             </p></dd>
 627 <dt><span class="term">Throws:</span></dt>
 628 <dd><p>
 629               Nothing.
 630             </p></dd>
 631 </dl>
 632 </div>
 633 <h5>
 634 <a name="context.abstract_context.econtext.h20"></a>
 635         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___lt____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___lt____phrase___code_"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;=</span></code></a>
 636       </h5>
 637 <pre class="programlisting"><span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&lt;=(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 638 </pre>
 639 <div class="variablelist">
 640 <p class="title"><b></b></p>
 641 <dl>
 642 <dt><span class="term">Returns:</span></dt>
 643 <dd><p>
 644               <code class="computeroutput"><span class="special">!</span> <span class="special">(</span><span class="identifier">other</span> <span class="special">&lt;</span>
 645               <span class="special">*</span> <span class="keyword">this</span><span class="special">)</span></code>
 646             </p></dd>
 647 <dt><span class="term">Throws:</span></dt>
 648 <dd><p>
 649               Nothing.
 650             </p></dd>
 651 </dl>
 652 </div>
 653 <h5>
 654 <a name="context.abstract_context.econtext.h21"></a>
 655         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___gt____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___gt____phrase___code_"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&gt;=</span></code></a>
 656       </h5>
 657 <pre class="programlisting"><span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">&gt;=(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
 658 </pre>
 659 <div class="variablelist">
 660 <p class="title"><b></b></p>
 661 <dl>
 662 <dt><span class="term">Returns:</span></dt>
 663 <dd><p>
 664               <code class="computeroutput"><span class="special">!</span> <span class="special">(*</span>
 665               <span class="keyword">this</span> <span class="special">&lt;</span>
 666               <span class="identifier">other</span><span class="special">)</span></code>
 667             </p></dd>
 668 <dt><span class="term">Throws:</span></dt>
 669 <dd><p>
 670               Nothing.
 671             </p></dd>
 672 </dl>
 673 </div>
 674 <h5>
 675 <a name="context.abstract_context.econtext.h22"></a>
 676         <span><a name="context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___lt__lt___phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__keyword__operator__phrase__phrase_role__special___lt__lt___phrase___code_"><code class="computeroutput"><span class="keyword">operator</span><span class="special">&lt;&lt;</span></code></a>
 677       </h5>
 678 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traitsT</span> <span class="special">&gt;</span>
 679 <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span>
 680 <span class="keyword">operator</span><span class="special">&lt;&lt;(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traitsT</span> <span class="special">&gt;</span> <span class="special">&amp;</span> <span class="identifier">os</span><span class="special">,</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">other</span><span class="special">);</span>
 681 </pre>
 682 <div class="variablelist">
 683 <p class="title"><b></b></p>
 684 <dl>
 685 <dt><span class="term">Efects:</span></dt>
 686 <dd><p>
 687               Writes the representation of <code class="computeroutput"><span class="identifier">other</span></code>
 688               to stream <code class="computeroutput"><span class="identifier">os</span></code>.
 689             </p></dd>
 690 <dt><span class="term">Returns:</span></dt>
 691 <dd><p>
 692               <code class="computeroutput"><span class="identifier">os</span></code>
 693             </p></dd>
 694 </dl>
 695 </div>
 696 <h5>
 697 <a name="context.abstract_context.econtext.h23"></a>
 698         <span><a name="context.abstract_context.econtext.struct__code__phrase_role__identifier__preallocated__phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext.struct__code__phrase_role__identifier__preallocated__phrase___code_">Struct
 699         <code class="computeroutput"><span class="identifier">preallocated</span></code></a>
 700       </h5>
 701 <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">preallocated</span> <span class="special">{</span>
 702     <span class="keyword">void</span>        <span class="special">*</span>   <span class="identifier">sp</span><span class="special">;</span>
 703     <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span>     <span class="identifier">size</span><span class="special">;</span>
 704     <span class="identifier">stack_context</span>   <span class="identifier">sctx</span><span class="special">;</span>
 705
 706     <span class="identifier">preallocated</span><span class="special">(</span> <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">sp</span><span class="special">,</span> <span class="identifier">std</span><span class="special">:</span><span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">,</span> <span class="identifier">stack_allocator</span> <span class="identifier">sctx</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
 707 <span class="special">};</span>
 708 </pre>
 709 <h5>
 710 <a name="context.abstract_context.econtext.h24"></a>
 711         <span><a name="context.abstract_context.econtext._code__phrase_role__identifier__preallocated__phrase__phrase_role__special_____phrase___phrase_role__keyword__void__phrase___phrase_role__special_____phrase___phrase_role__identifier__sp__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special_____phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__size__phrase__phrase_role__special_____phrase___phrase_role__identifier__stack_allocator__phrase___phrase_role__identifier__sctx__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="econtext.html#context.abstract_context.econtext._code__phrase_role__identifier__preallocated__phrase__phrase_role__special_____phrase___phrase_role__keyword__void__phrase___phrase_role__special_____phrase___phrase_role__identifier__sp__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special_____phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__size__phrase__phrase_role__special_____phrase___phrase_role__identifier__stack_allocator__phrase___phrase_role__identifier__sctx__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="identifier">preallocated</span><span class="special">(</span>
 712         <span class="keyword">void</span> <span class="special">*</span> <span class="identifier">sp</span><span class="special">,</span> <span class="identifier">std</span><span class="special">:</span><span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">,</span> <span class="identifier">stack_allocator</span> <span class="identifier">sctx</span><span class="special">)</span></code></a>
 713       </h5>
 714 <div class="variablelist">
 715 <p class="title"><b></b></p>
 716 <dl>
 717 <dt><span class="term">Effects:</span></dt>
 718 <dd><p>
 719               Creates an object of preallocated.
 720             </p></dd>
 721 </dl>
 722 </div>
 723 </div>
 724 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 725 <td align="left"></td>
 726 <td align="right"><div class="copyright-footer">Copyright &#169; 2014 Oliver Kowalke<p>
 727         Distributed under the Boost Software License, Version 1.0. (See accompanying
 728         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
 729       </p>
 730 </div></td>
 731 </tr></table>
 732 <hr>
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