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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | |
27 | <a name="context.econtext"></a><a name="econtext"></a><a class="link" href="econtext.html" title="Class execution_context">Class execution_context</a> | |
28 | </h2></div></div></div> | |
29 | <p> | |
30 | Class <span class="emphasis"><em>execution_context</em></span> encapsulates context switching | |
31 | and manages the associated context' stack (allocation/deallocation). | |
32 | </p> | |
33 | <p> | |
34 | <span class="emphasis"><em>execution_context</em></span> allocates the context stack (using its | |
35 | <a class="link" href="stack.html#stack"><span class="emphasis"><em>StackAllocator</em></span></a> argument) | |
36 | and creates a control structure on top of it. This structure is responsible | |
37 | for managing context' stack. Instances of <span class="emphasis"><em>execution_context</em></span>, | |
38 | associated with a specific context, share the ownership of the control structure. | |
39 | If the last reference goes out of scope, the control structure is destroyed | |
40 | and the stack gets deallocated via the <span class="emphasis"><em>StackAllocator</em></span>. | |
41 | </p> | |
42 | <p> | |
43 | <span class="emphasis"><em>execution_context</em></span> is copy-constructible, move-constructible, | |
44 | copy-assignable and move-assignable. | |
45 | </p> | |
46 | <p> | |
47 | <span class="emphasis"><em>execution_context</em></span> maintains a static (thread-local) pointer, | |
48 | accessed by <span class="emphasis"><em>execution_context::current()</em></span>, pointing to | |
49 | the active context. On each context switch the pointer is updated. The usage | |
50 | of this global pointer makes the context switch a little bit slower (due access | |
51 | of thread local storage) but has some advantages. It allows to access the control | |
52 | structure of the current active context from arbitrary code paths required | |
53 | in order to support segmented stacks, which require to call certain maintenance | |
54 | functions (like __splitstack_getcontext() etc.) before each context switch | |
55 | (each context switch exchanges the stack). Additionally, because the control | |
56 | structure is directly accessible in the destructor of <span class="emphasis"><em>execution_context</em></span> | |
57 | (member variable), the deallocation of context' stack is faster compared to | |
58 | <a class="link" href="ccontext.html#ccontext"><span class="emphasis"><em>captured_context</em></span></a>. | |
59 | </p> | |
60 | <p> | |
61 | <span class="emphasis"><em>execution_context</em></span> expects a function/functor with signature | |
62 | <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="keyword">void</span><span class="special">*</span> <span class="identifier">vp</span><span class="special">)</span></code> (<code class="computeroutput"><span class="identifier">vp</span></code> | |
63 | is the data passed at the first invocation of <a class="link" href="econtext.html#execution_context_operator_call"> <code class="computeroutput">execution_context::operator()()</code></a>). | |
64 | </p> | |
65 | <a name="ec_fibonacci"></a><h4> | |
66 | <a name="context.econtext.h0"></a> | |
67 | <span><a name="context.econtext.usage_of__emphasis_execution_context__emphasis_"></a></span><a class="link" href="econtext.html#context.econtext.usage_of__emphasis_execution_context__emphasis_">usage | |
68 | of <span class="emphasis"><em>execution_context</em></span></a> | |
69 | </h4> | |
70 | <pre class="programlisting"><span class="keyword">int</span> <span class="identifier">n</span><span class="special">=</span><span class="number">35</span><span class="special">;</span> | |
71 | <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">sink</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> | |
72 | <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">source</span><span class="special">(</span> | |
73 | <span class="special">[</span><span class="identifier">n</span><span class="special">,&</span><span class="identifier">sink</span><span class="special">](</span><span class="keyword">void</span><span class="special">*)</span><span class="keyword">mutable</span><span class="special">{</span> | |
74 | <span class="keyword">int</span> <span class="identifier">a</span><span class="special">=</span><span class="number">0</span><span class="special">;</span> | |
75 | <span class="keyword">int</span> <span class="identifier">b</span><span class="special">=</span><span class="number">1</span><span class="special">;</span> | |
76 | <span class="keyword">while</span><span class="special">(</span><span class="identifier">n</span><span class="special">--></span><span class="number">0</span><span class="special">){</span> | |
77 | <span class="identifier">sink</span><span class="special">(&</span><span class="identifier">a</span><span class="special">);</span> | |
78 | <span class="keyword">auto</span> <span class="identifier">next</span><span class="special">=</span><span class="identifier">a</span><span class="special">+</span><span class="identifier">b</span><span class="special">;</span> | |
79 | <span class="identifier">a</span><span class="special">=</span><span class="identifier">b</span><span class="special">;</span> | |
80 | <span class="identifier">b</span><span class="special">=</span><span class="identifier">next</span><span class="special">;</span> | |
81 | <span class="special">}</span> | |
82 | <span class="special">});</span> | |
83 | <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span><span class="special">=</span><span class="number">0</span><span class="special">;</span><span class="identifier">i</span><span class="special"><</span><span class="number">10</span><span class="special">;++</span><span class="identifier">i</span><span class="special">){</span> | |
84 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"><<*(</span><span class="keyword">int</span><span class="special">*)</span><span class="identifier">source</span><span class="special">()<<</span><span class="string">" "</span><span class="special">;</span> | |
85 | <span class="special">}</span> | |
86 | ||
87 | <span class="identifier">output</span><span class="special">:</span> | |
88 | <span class="number">0</span> <span class="number">1</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">5</span> <span class="number">8</span> <span class="number">13</span> <span class="number">21</span> <span class="number">34</span> | |
89 | </pre> | |
90 | <p> | |
91 | This simple example demonstrates the basic usage of <span class="emphasis"><em>execution_context</em></span>. | |
92 | The context <code class="computeroutput"><span class="identifier">sink</span></code>, returned | |
93 | by <span class="emphasis"><em>execution_context::current()</em></span>, represents the <span class="emphasis"><em>main</em></span>-context | |
94 | (function <span class="emphasis"><em>main()</em></span> running) and is one of the captured parameters | |
95 | in the lambda expression. The lambda that calculates the Fibonacci numbers | |
96 | is executed inside the context represented by <code class="computeroutput"><span class="identifier">source</span></code>. | |
97 | Calculated Fibonacci numbers are transferred between the two context' via expression | |
98 | <span class="emphasis"><em>sink(&a)</em></span> (and returned by <span class="emphasis"><em>source()</em></span>). | |
99 | </p> | |
100 | <p> | |
101 | The locale variables <code class="computeroutput"><span class="identifier">a</span></code>, <code class="computeroutput"><span class="identifier">b</span></code> and <code class="computeroutput"> <span class="identifier">next</span></code> | |
102 | remain their values during each context switch (<span class="emphasis"><em>yield(a)</em></span>). | |
103 | This is possible because <code class="computeroutput"><span class="identifier">ctx</span></code> | |
104 | owns a stack (exchanged by context switch). | |
105 | </p> | |
106 | <h4> | |
107 | <a name="context.econtext.h1"></a> | |
108 | <span><a name="context.econtext.inverting_the_control_flow"></a></span><a class="link" href="econtext.html#context.econtext.inverting_the_control_flow">inverting | |
109 | the control flow</a> | |
110 | </h4> | |
111 | <pre class="programlisting"><span class="comment">/* | |
112 | * grammar: | |
113 | * P ---> E '\0' | |
114 | * E ---> T {('+'|'-') T} | |
115 | * T ---> S {('*'|'/') S} | |
116 | * S ---> digit | '(' E ')' | |
117 | */</span> | |
118 | <span class="keyword">class</span> <span class="identifier">Parser</span><span class="special">{</span> | |
119 | <span class="comment">// implementation omitted; see examples directory</span> | |
120 | <span class="special">};</span> | |
121 | ||
122 | <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> | |
123 | <span class="keyword">bool</span> <span class="identifier">done</span><span class="special">=</span><span class="keyword">false</span><span class="special">;</span> | |
124 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span> <span class="identifier">except</span><span class="special">;</span> | |
125 | ||
126 | <span class="comment">// create handle to main execution context</span> | |
127 | <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> | |
128 | <span class="comment">// execute parser in new execution context</span> | |
129 | <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">source</span><span class="special">(</span> | |
130 | <span class="special">[&</span><span class="identifier">sink</span><span class="special">,&</span><span class="identifier">is</span><span class="special">,&</span><span class="identifier">done</span><span class="special">,&</span><span class="identifier">except</span><span class="special">](</span><span class="keyword">void</span><span class="special">*){</span> | |
131 | <span class="comment">// create parser with callback function</span> | |
132 | <span class="identifier">Parser</span> <span class="identifier">p</span><span class="special">(</span><span class="identifier">is</span><span class="special">,</span> | |
133 | <span class="special">[&</span><span class="identifier">sink</span><span class="special">](</span><span class="keyword">char</span> <span class="identifier">ch</span><span class="special">){</span> | |
134 | <span class="comment">// resume main execution context</span> | |
135 | <span class="identifier">sink</span><span class="special">(&</span><span class="identifier">ch</span><span class="special">);</span> | |
136 | <span class="special">});</span> | |
137 | <span class="keyword">try</span> <span class="special">{</span> | |
138 | <span class="comment">// start recursive parsing</span> | |
139 | <span class="identifier">p</span><span class="special">.</span><span class="identifier">run</span><span class="special">();</span> | |
140 | <span class="special">}</span> <span class="keyword">catch</span> <span class="special">(...)</span> <span class="special">{</span> | |
141 | <span class="comment">// store other exceptions in exception-pointer</span> | |
142 | <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> | |
143 | <span class="special">}</span> | |
144 | <span class="comment">// set termination flag</span> | |
145 | <span class="identifier">done</span><span class="special">=</span><span class="keyword">true</span><span class="special">;</span> | |
146 | <span class="comment">// resume main execution context</span> | |
147 | <span class="identifier">sink</span><span class="special">();</span> | |
148 | <span class="special">});</span> | |
149 | ||
150 | <span class="comment">// user-code pulls parsed data from parser</span> | |
151 | <span class="comment">// invert control flow</span> | |
152 | <span class="keyword">void</span><span class="special">*</span> <span class="identifier">vp</span> <span class="special">=</span> <span class="identifier">source</span><span class="special">();</span> | |
153 | <span class="keyword">if</span> <span class="special">(</span><span class="identifier">except</span><span class="special">)</span> <span class="special">{</span> | |
154 | <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> | |
155 | <span class="special">}</span> | |
156 | <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> | |
157 | <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"><</span><span class="keyword">char</span><span class="special">*>(</span><span class="identifier">vp</span><span class="special">));</span> | |
158 | <span class="identifier">vp</span> <span class="special">=</span> <span class="identifier">source</span><span class="special">();</span> | |
159 | <span class="keyword">if</span> <span class="special">(</span><span class="identifier">except</span><span class="special">)</span> <span class="special">{</span> | |
160 | <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> | |
161 | <span class="special">}</span> | |
162 | <span class="special">}</span> | |
163 | ||
164 | <span class="identifier">output</span><span class="special">:</span> | |
165 | <span class="identifier">Parsed</span><span class="special">:</span> <span class="number">1</span> | |
166 | <span class="identifier">Parsed</span><span class="special">:</span> <span class="special">+</span> | |
167 | <span class="identifier">Parsed</span><span class="special">:</span> <span class="number">1</span> | |
168 | </pre> | |
169 | <p> | |
170 | In this example a recursive descent parser uses a callback to emit a newly | |
171 | passed symbol. Using <span class="emphasis"><em>execution_context</em></span> the control flow | |
172 | can be inverted, e.g. the user-code pulls parsed symbols from the parser - | |
173 | instead to get pushed from the parser (via callback). | |
174 | </p> | |
175 | <p> | |
176 | The data (character) is transferred between the two <span class="emphasis"><em>execution_context</em></span>. | |
177 | </p> | |
178 | <p> | |
179 | If the code executed by <span class="emphasis"><em>execution_context</em></span> emits an exception, | |
180 | the application is terminated. <span class="emphasis"><em>std::exception_ptr</em></span> can | |
181 | be used to transfer exceptions between different execution contexts. | |
182 | </p> | |
183 | <p> | |
184 | Sometimes it is necessary to unwind the stack of an unfinished context to destroy | |
185 | local stack variables so they can release allocated resources (RAII pattern). | |
186 | The user is responsible for this task. | |
187 | </p> | |
188 | <a name="ec_prealloc"></a><h4> | |
189 | <a name="context.econtext.h2"></a> | |
190 | <span><a name="context.econtext.allocating_control_structures_on_top_of_stack"></a></span><a class="link" href="econtext.html#context.econtext.allocating_control_structures_on_top_of_stack">allocating | |
191 | control structures on top of stack</a> | |
192 | </h4> | |
193 | <p> | |
194 | Allocating control structures on top of the stack requires to allocated the | |
195 | <span class="emphasis"><em>stack_context</em></span> and create the control structure with placement | |
196 | new before <span class="emphasis"><em>execution_context</em></span> is created. | |
197 | </p> | |
198 | <div class="note"><table border="0" summary="Note"> | |
199 | <tr> | |
200 | <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../doc/src/images/note.png"></td> | |
201 | <th align="left">Note</th> | |
202 | </tr> | |
203 | <tr><td align="left" valign="top"><p> | |
204 | The user is responsible for destructing the control structure at the top | |
205 | of the stack. | |
206 | </p></td></tr> | |
207 | </table></div> | |
208 | <pre class="programlisting"><span class="comment">// stack-allocator used for (de-)allocating stack</span> | |
209 | <span class="identifier">fixedsize_stack</span> <span class="identifier">salloc</span><span class="special">(</span> <span class="number">4048</span><span class="special">);</span> | |
210 | <span class="comment">// allocate stack space</span> | |
211 | <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> | |
212 | <span class="comment">// reserve space for control structure on top of the stack</span> | |
213 | <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"><</span> <span class="keyword">char</span> <span class="special">*</span> <span class="special">>(</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> | |
214 | <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> | |
215 | <span class="comment">// placement new creates control structure on reserved space</span> | |
216 | <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> | |
217 | <span class="special">...</span> | |
218 | <span class="comment">// destructing the control structure</span> | |
219 | <span class="identifier">cs</span><span class="special">->~</span><span class="identifier">my_control_structure</span><span class="special">();</span> | |
220 | <span class="special">...</span> | |
221 | <span class="keyword">struct</span> <span class="identifier">my_control_structure</span> <span class="special">{</span> | |
222 | <span class="comment">// execution context</span> | |
223 | <span class="identifier">execution_context</span> <span class="identifier">ectx</span><span class="special">;</span> | |
224 | ||
225 | <span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">StackAllocator</span> <span class="special">></span> | |
226 | <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> | |
227 | <span class="comment">// create execution context</span> | |
228 | <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> | |
229 | <span class="special">}</span> | |
230 | <span class="special">...</span> | |
231 | <span class="special">};</span> | |
232 | </pre> | |
233 | <h4> | |
234 | <a name="context.econtext.h3"></a> | |
235 | <span><a name="context.econtext.exception_handling"></a></span><a class="link" href="econtext.html#context.econtext.exception_handling">exception | |
236 | handling</a> | |
237 | </h4> | |
238 | <p> | |
239 | If the function executed inside a <span class="emphasis"><em>execution_context</em></span> emits | |
240 | ans exception, the application is terminated by calling <span class="emphasis"><em>std::terminate()</em></span>. | |
241 | <span class="emphasis"><em>std::exception_ptr</em></span> can be used to transfer exceptions | |
242 | between different execution contexts. | |
243 | </p> | |
244 | <h4> | |
245 | <a name="context.econtext.h4"></a> | |
246 | <span><a name="context.econtext.parameter_passing"></a></span><a class="link" href="econtext.html#context.econtext.parameter_passing">parameter | |
247 | passing</a> | |
248 | </h4> | |
249 | <p> | |
250 | The void pointer argument passed to <span class="emphasis"><em>execution_context::operator()</em></span>, | |
251 | in one context, is passed as the last argument of the <span class="emphasis"><em>context-function</em></span> | |
252 | if the context is started for the first time. In all following invocations | |
253 | of <span class="emphasis"><em>execution_context::operator()</em></span> the void pointer passed | |
254 | to <span class="emphasis"><em>execution_context::operator()</em></span>, in one context, is returned | |
255 | by <span class="emphasis"><em>execution_context::operator()</em></span> in the other context. | |
256 | </p> | |
257 | <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">X</span> <span class="special">{</span> | |
258 | <span class="keyword">private</span><span class="special">:</span> | |
259 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span> <span class="identifier">excptr_</span><span class="special">;</span> | |
260 | <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> | |
261 | <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> | |
262 | ||
263 | <span class="keyword">public</span><span class="special">:</span> | |
264 | <span class="identifier">X</span><span class="special">()</span> <span class="special">:</span> | |
265 | <span class="identifier">excptr_</span><span class="special">(),</span> | |
266 | <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> | |
267 | <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> | |
268 | <span class="keyword">try</span> <span class="special">{</span> | |
269 | <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"><</span> <span class="keyword">int</span> <span class="special">*</span> <span class="special">>(</span> <span class="identifier">vp</span><span class="special">);</span> | |
270 | <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"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">>(</span><span class="identifier">i</span><span class="special">);</span> | |
271 | <span class="identifier">caller_</span><span class="special">(</span> <span class="special">&</span> <span class="identifier">str</span><span class="special">);</span> | |
272 | <span class="special">}</span> <span class="keyword">catch</span> <span class="special">(...)</span> <span class="special">{</span> | |
273 | <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> | |
274 | <span class="special">}</span> | |
275 | <span class="special">})</span> | |
276 | <span class="special">{}</span> | |
277 | ||
278 | <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> | |
279 | <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">&</span> <span class="identifier">i</span><span class="special">);</span> | |
280 | <span class="keyword">if</span><span class="special">(</span><span class="identifier">excptr_</span><span class="special">){</span> | |
281 | <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> | |
282 | <span class="special">}</span> | |
283 | <span class="keyword">return</span> <span class="special">*</span> <span class="keyword">static_cast</span><span class="special"><</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">*</span> <span class="special">>(</span> <span class="identifier">ret</span><span class="special">);</span> | |
284 | <span class="special">}</span> | |
285 | <span class="special">};</span> | |
286 | ||
287 | <span class="identifier">X</span> <span class="identifier">x</span><span class="special">;</span> | |
288 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">x</span><span class="special">(</span> <span class="number">7</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> | |
289 | ||
290 | <span class="identifier">output</span><span class="special">:</span> | |
291 | <span class="number">7</span> | |
292 | </pre> | |
293 | <h4> | |
294 | <a name="context.econtext.h5"></a> | |
295 | <span><a name="context.econtext.class__code__phrase_role__identifier__execution_context__phrase___code_"></a></span><a class="link" href="econtext.html#context.econtext.class__code__phrase_role__identifier__execution_context__phrase___code_">Class | |
296 | <code class="computeroutput"><span class="identifier">execution_context</span></code></a> | |
297 | </h4> | |
298 | <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">execution_context</span> <span class="special">{</span> | |
299 | <span class="keyword">public</span><span class="special">:</span> | |
300 | <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> | |
301 | ||
302 | <span class="keyword">template</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">></span> | |
303 | <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">Fn</span> <span class="special">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
304 | ||
305 | <span class="keyword">template</span><span class="special"><</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">></span> | |
306 | <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">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
307 | ||
308 | <span class="keyword">template</span><span class="special"><</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">></span> | |
309 | <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">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
310 | ||
311 | <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
312 | <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">execution_context</span> <span class="special">&&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
313 | ||
314 | <span class="identifier">execution_context</span> <span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
315 | <span class="identifier">execution_context</span> <span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span> <span class="identifier">execution_context</span> <span class="special">&&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
316 | ||
317 | <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> | |
318 | <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> | |
319 | ||
320 | <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> | |
321 | ||
322 | <span class="keyword">template</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">></span> | |
323 | <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">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
324 | ||
325 | <span class="keyword">template</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">></span> | |
326 | <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">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
327 | ||
328 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
329 | ||
330 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
331 | ||
332 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
333 | ||
334 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
335 | ||
336 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
337 | ||
338 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
339 | ||
340 | <span class="keyword">template</span><span class="special"><</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">></span> | |
341 | <span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traitsT</span> <span class="special">></span> <span class="special">&</span> | |
342 | <span class="keyword">operator</span><span class="special"><<(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traitsT</span> <span class="special">></span> <span class="special">&</span> <span class="identifier">os</span><span class="special">,</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">);</span> | |
343 | <span class="special">};</span> | |
344 | </pre> | |
345 | <p> | |
346 | </p> | |
347 | <h5> | |
348 | <a name="execution_context_current_bridgehead"></a> | |
349 | <span><a name="execution_context_current"></a></span> | |
350 | <a class="link" href="econtext.html#execution_context_current">Static | |
351 | member function <code class="computeroutput">current</code>()</a> | |
352 | </h5> | |
353 | <p> | |
354 | </p> | |
355 | <pre class="programlisting"><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> | |
356 | </pre> | |
357 | <div class="variablelist"> | |
358 | <p class="title"><b></b></p> | |
359 | <dl> | |
360 | <dt><span class="term">Returns:</span></dt> | |
361 | <dd><p> | |
362 | Returns an instance of excution_context pointing to the active execution | |
363 | context. | |
364 | </p></dd> | |
365 | <dt><span class="term">Throws:</span></dt> | |
366 | <dd><p> | |
367 | Nothing. | |
368 | </p></dd> | |
369 | </dl> | |
370 | </div> | |
371 | <p> | |
372 | </p> | |
373 | <h5> | |
374 | <a name="execution_context_constructor_bridgehead"></a> | |
375 | <span><a name="execution_context_constructor"></a></span> | |
376 | <a class="link" href="econtext.html#execution_context_constructor">Constructor</a> | |
377 | </h5> | |
378 | <p> | |
379 | </p> | |
380 | <pre class="programlisting"><span class="keyword">template</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">></span> | |
381 | <span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">Fn</span> <span class="special">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
382 | ||
383 | <span class="keyword">template</span><span class="special"><</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">></span> | |
384 | <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">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
385 | ||
386 | <span class="keyword">template</span><span class="special"><</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">></span> | |
387 | <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">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
388 | </pre> | |
389 | <div class="variablelist"> | |
390 | <p class="title"><b></b></p> | |
391 | <dl> | |
392 | <dt><span class="term">Effects:</span></dt> | |
393 | <dd><p> | |
394 | Creates a new execution context and prepares the context to execute | |
395 | <code class="computeroutput"><span class="identifier">fn</span></code>. <code class="computeroutput"><span class="identifier">fixedsize_stack</span></code> | |
396 | is used as default stack allocator (stack size == fixedsize_stack::traits::default_size()). | |
397 | The constructor with argument type <code class="computeroutput"><span class="identifier">preallocated</span></code>, | |
398 | is used to create a user defined data <a class="link" href="econtext.html#ec_prealloc">(for | |
399 | instance additional control structures)</a> on top of the stack. | |
400 | </p></dd> | |
401 | </dl> | |
402 | </div> | |
403 | <p> | |
404 | </p> | |
405 | <h5> | |
406 | <a name="execution_context_copy%20constructor_bridgehead"></a> | |
407 | <span><a name="execution_context_copy%20constructor"></a></span> | |
408 | <a class="link" href="econtext.html#execution_context_copy%20constructor">Copy constructor</a> | |
409 | </h5> | |
410 | <p> | |
411 | </p> | |
412 | <pre class="programlisting"><span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
413 | </pre> | |
414 | <div class="variablelist"> | |
415 | <p class="title"><b></b></p> | |
416 | <dl> | |
417 | <dt><span class="term">Effects:</span></dt> | |
418 | <dd><p> | |
419 | Copies <code class="computeroutput"><span class="identifier">other</span></code>, e.g. underlying | |
420 | control structure is shared with <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>. | |
421 | </p></dd> | |
422 | <dt><span class="term">Throws:</span></dt> | |
423 | <dd><p> | |
424 | Nothing. | |
425 | </p></dd> | |
426 | </dl> | |
427 | </div> | |
428 | <p> | |
429 | </p> | |
430 | <h5> | |
431 | <a name="execution_context_move%20constructor_bridgehead"></a> | |
432 | <span><a name="execution_context_move%20constructor"></a></span> | |
433 | <a class="link" href="econtext.html#execution_context_move%20constructor">Move constructor</a> | |
434 | </h5> | |
435 | <p> | |
436 | </p> | |
437 | <pre class="programlisting"><span class="identifier">execution_context</span><span class="special">(</span> <span class="identifier">execution_context</span> <span class="special">&&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
438 | </pre> | |
439 | <div class="variablelist"> | |
440 | <p class="title"><b></b></p> | |
441 | <dl> | |
442 | <dt><span class="term">Effects:</span></dt> | |
443 | <dd><p> | |
444 | Moves underlying control structure to <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>. | |
445 | </p></dd> | |
446 | <dt><span class="term">Throws:</span></dt> | |
447 | <dd><p> | |
448 | Nothing. | |
449 | </p></dd> | |
450 | </dl> | |
451 | </div> | |
452 | <p> | |
453 | </p> | |
454 | <h5> | |
455 | <a name="execution_context_copy%20assignment_bridgehead"></a> | |
456 | <span><a name="execution_context_copy%20assignment"></a></span> | |
457 | <a class="link" href="econtext.html#execution_context_copy%20assignment">Copy assignment operator</a> | |
458 | </h5> | |
459 | <p> | |
460 | </p> | |
461 | <pre class="programlisting"><span class="identifier">execution_context</span> <span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
462 | </pre> | |
463 | <div class="variablelist"> | |
464 | <p class="title"><b></b></p> | |
465 | <dl> | |
466 | <dt><span class="term">Effects:</span></dt> | |
467 | <dd><p> | |
468 | Copies the state of <code class="computeroutput"><span class="identifier">other</span></code> | |
469 | to <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>, | |
470 | control structure is shared. | |
471 | </p></dd> | |
472 | <dt><span class="term">Throws:</span></dt> | |
473 | <dd><p> | |
474 | Nothing. | |
475 | </p></dd> | |
476 | </dl> | |
477 | </div> | |
478 | <p> | |
479 | </p> | |
480 | <h5> | |
481 | <a name="execution_context_move%20assignment_bridgehead"></a> | |
482 | <span><a name="execution_context_move%20assignment"></a></span> | |
483 | <a class="link" href="econtext.html#execution_context_move%20assignment">Move assignment operator</a> | |
484 | </h5> | |
485 | <p> | |
486 | </p> | |
487 | <pre class="programlisting"><span class="identifier">execution_context</span> <span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span> <span class="identifier">execution_context</span> <span class="special">&&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
488 | </pre> | |
489 | <div class="variablelist"> | |
490 | <p class="title"><b></b></p> | |
491 | <dl> | |
492 | <dt><span class="term">Effects:</span></dt> | |
493 | <dd><p> | |
494 | Moves the control structure of <code class="computeroutput"><span class="identifier">other</span></code> | |
495 | to <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> | |
496 | using move semantics. | |
497 | </p></dd> | |
498 | <dt><span class="term">Throws:</span></dt> | |
499 | <dd><p> | |
500 | Nothing. | |
501 | </p></dd> | |
502 | </dl> | |
503 | </div> | |
504 | <p> | |
505 | </p> | |
506 | <h5> | |
507 | <a name="execution_context_operator_bool_bridgehead"></a> | |
508 | <span><a name="execution_context_operator_bool"></a></span> | |
509 | <a class="link" href="econtext.html#execution_context_operator_bool">Member | |
510 | function <code class="computeroutput">operator bool</code>()</a> | |
511 | </h5> | |
512 | <p> | |
513 | </p> | |
514 | <pre class="programlisting"><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> | |
515 | </pre> | |
516 | <div class="variablelist"> | |
517 | <p class="title"><b></b></p> | |
518 | <dl> | |
519 | <dt><span class="term">Returns:</span></dt> | |
520 | <dd><p> | |
521 | <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> points to a control structure. | |
522 | </p></dd> | |
523 | <dt><span class="term">Throws:</span></dt> | |
524 | <dd><p> | |
525 | Nothing. | |
526 | </p></dd> | |
527 | </dl> | |
528 | </div> | |
529 | <p> | |
530 | </p> | |
531 | <h5> | |
532 | <a name="execution_context_operator_not_bridgehead"></a> | |
533 | <span><a name="execution_context_operator_not"></a></span> | |
534 | <a class="link" href="econtext.html#execution_context_operator_not">Member | |
535 | function <code class="computeroutput">operator!</code>()</a> | |
536 | </h5> | |
537 | <p> | |
538 | </p> | |
539 | <pre class="programlisting"><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> | |
540 | </pre> | |
541 | <div class="variablelist"> | |
542 | <p class="title"><b></b></p> | |
543 | <dl> | |
544 | <dt><span class="term">Returns:</span></dt> | |
545 | <dd><p> | |
546 | <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> does not point to a control structure. | |
547 | </p></dd> | |
548 | <dt><span class="term">Throws:</span></dt> | |
549 | <dd><p> | |
550 | Nothing. | |
551 | </p></dd> | |
552 | </dl> | |
553 | </div> | |
554 | <p> | |
555 | </p> | |
556 | <h5> | |
557 | <a name="execution_context_operator_call_bridgehead"></a> | |
558 | <span><a name="execution_context_operator_call"></a></span> | |
559 | <a class="link" href="econtext.html#execution_context_operator_call">Member | |
560 | function <code class="computeroutput">operator()</code>()</a> | |
561 | </h5> | |
562 | <p> | |
563 | </p> | |
564 | <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> | |
565 | </pre> | |
566 | <div class="variablelist"> | |
567 | <p class="title"><b></b></p> | |
568 | <dl> | |
569 | <dt><span class="term">Effects:</span></dt> | |
570 | <dd><p> | |
571 | Stores internally the current context data (stack pointer, instruction | |
572 | pointer, and CPU registers) of the current active context and restores | |
573 | 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 | |
574 | context. The void pointer argument, <code class="computeroutput"><span class="identifier">vp</span></code>, | |
575 | is passed to the current context to be returned by the most recent call | |
576 | 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> | |
577 | is executed with arguments <code class="computeroutput"><span class="identifier">args</span></code> | |
578 | on top of the stack of <code class="computeroutput"><span class="keyword">this</span></code>. | |
579 | </p></dd> | |
580 | <dt><span class="term">Note:</span></dt> | |
581 | <dd><p> | |
582 | The behaviour is undefined if <code class="computeroutput"><span class="keyword">operator</span><span class="special">()()</span></code> is called while <span class="emphasis"><em>execution_context::current()</em></span> | |
583 | returns <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> | |
584 | (e.g. resuming an already running context). If the top-level context | |
585 | function returns, <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">exit</span><span class="special">()</span></code> is called. | |
586 | </p></dd> | |
587 | <dt><span class="term">Returns:</span></dt> | |
588 | <dd><p> | |
589 | The void pointer argument passed to the most recent call to <span class="emphasis"><em>execution_context::operator()</em></span>, | |
590 | if any. | |
591 | </p></dd> | |
592 | </dl> | |
593 | </div> | |
594 | <p> | |
595 | </p> | |
596 | <h5> | |
597 | <a name="execution_context_operator_call_ontop_bridgehead"></a> | |
598 | <span><a name="execution_context_operator_call_ontop"></a></span> | |
599 | <a class="link" href="econtext.html#execution_context_operator_call_ontop">Member | |
600 | function <code class="computeroutput">operator(exec_ontop_arg_t)</code>()</a> | |
601 | </h5> | |
602 | <p> | |
603 | </p> | |
604 | <pre class="programlisting"><span class="keyword">template</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">></span> | |
605 | <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">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
606 | ||
607 | <span class="keyword">template</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">></span> | |
608 | <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">&&</span> <span class="identifier">fn</span><span class="special">,</span> <span class="identifier">Args</span> <span class="special">&&</span> <span class="special">...</span> <span class="identifier">args</span><span class="special">);</span> | |
609 | </pre> | |
610 | <div class="variablelist"> | |
611 | <p class="title"><b></b></p> | |
612 | <dl> | |
613 | <dt><span class="term">Effects:</span></dt> | |
614 | <dd><p> | |
615 | Same as <span class="emphasis"><em>execution_context::operator()</em></span>. Additionally, | |
616 | function <code class="computeroutput"><span class="identifier">fn</span></code> is executed | |
617 | with arguments <code class="computeroutput"><span class="identifier">args</span></code> in | |
618 | the context of <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> | |
619 | (e.g. the stack frame of <code class="computeroutput"><span class="identifier">fn</span></code> | |
620 | is allocated on stack of <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>). | |
621 | </p></dd> | |
622 | <dt><span class="term">Returns:</span></dt> | |
623 | <dd><p> | |
624 | The void pointer argument passed to the most recent call to <span class="emphasis"><em>execution_context::operator()</em></span>, | |
625 | if any. | |
626 | </p></dd> | |
627 | </dl> | |
628 | </div> | |
629 | <p> | |
630 | </p> | |
631 | <h5> | |
632 | <a name="execution_context_operator_equal_bridgehead"></a> | |
633 | <span><a name="execution_context_operator_equal"></a></span> | |
634 | <a class="link" href="econtext.html#execution_context_operator_equal">Member | |
635 | function <code class="computeroutput">operator==</code>()</a> | |
636 | </h5> | |
637 | <p> | |
638 | </p> | |
639 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
640 | </pre> | |
641 | <div class="variablelist"> | |
642 | <p class="title"><b></b></p> | |
643 | <dl> | |
644 | <dt><span class="term">Returns:</span></dt> | |
645 | <dd><p> | |
646 | <code class="computeroutput"><span class="keyword">true</span></code> if <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> and <code class="computeroutput"><span class="identifier">other</span></code> | |
647 | represent the same execution context, <code class="computeroutput"><span class="keyword">false</span></code> | |
648 | otherwise. | |
649 | </p></dd> | |
650 | <dt><span class="term">Throws:</span></dt> | |
651 | <dd><p> | |
652 | Nothing. | |
653 | </p></dd> | |
654 | </dl> | |
655 | </div> | |
656 | <p> | |
657 | </p> | |
658 | <h5> | |
659 | <a name="execution_context_operator_notequal_bridgehead"></a> | |
660 | <span><a name="execution_context_operator_notequal"></a></span> | |
661 | <a class="link" href="econtext.html#execution_context_operator_notequal">Member | |
662 | function <code class="computeroutput">operator!=</code>()</a> | |
663 | </h5> | |
664 | <p> | |
665 | </p> | |
666 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
667 | </pre> | |
668 | <div class="variablelist"> | |
669 | <p class="title"><b></b></p> | |
670 | <dl> | |
671 | <dt><span class="term">Returns:</span></dt> | |
672 | <dd><p> | |
673 | <code class="computeroutput">! (other == * this)</code> | |
674 | </p></dd> | |
675 | <dt><span class="term">Throws:</span></dt> | |
676 | <dd><p> | |
677 | Nothing. | |
678 | </p></dd> | |
679 | </dl> | |
680 | </div> | |
681 | <p> | |
682 | </p> | |
683 | <h5> | |
684 | <a name="execution_context_operator_less_bridgehead"></a> | |
685 | <span><a name="execution_context_operator_less"></a></span> | |
686 | <a class="link" href="econtext.html#execution_context_operator_less">Member | |
687 | function <code class="computeroutput">operator<</code>()</a> | |
688 | </h5> | |
689 | <p> | |
690 | </p> | |
691 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
692 | </pre> | |
693 | <div class="variablelist"> | |
694 | <p class="title"><b></b></p> | |
695 | <dl> | |
696 | <dt><span class="term">Returns:</span></dt> | |
697 | <dd><p> | |
698 | <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> is true and the implementation-defined | |
699 | total order of <code class="computeroutput"><span class="identifier">execution_context</span></code> | |
700 | values places <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> | |
701 | before <code class="computeroutput"><span class="identifier">other</span></code>, false otherwise. | |
702 | </p></dd> | |
703 | <dt><span class="term">Throws:</span></dt> | |
704 | <dd><p> | |
705 | Nothing. | |
706 | </p></dd> | |
707 | </dl> | |
708 | </div> | |
709 | <p> | |
710 | </p> | |
711 | <h5> | |
712 | <a name="execution_context_operator_greater_bridgehead"></a> | |
713 | <span><a name="execution_context_operator_greater"></a></span> | |
714 | <a class="link" href="econtext.html#execution_context_operator_greater">Member | |
715 | function <code class="computeroutput">operator></code>()</a> | |
716 | </h5> | |
717 | <p> | |
718 | </p> | |
719 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
720 | </pre> | |
721 | <div class="variablelist"> | |
722 | <p class="title"><b></b></p> | |
723 | <dl> | |
724 | <dt><span class="term">Returns:</span></dt> | |
725 | <dd><p> | |
726 | <code class="computeroutput"><span class="identifier">other</span> <span class="special"><</span> | |
727 | <span class="special">*</span> <span class="keyword">this</span></code> | |
728 | </p></dd> | |
729 | <dt><span class="term">Throws:</span></dt> | |
730 | <dd><p> | |
731 | Nothing. | |
732 | </p></dd> | |
733 | </dl> | |
734 | </div> | |
735 | <p> | |
736 | </p> | |
737 | <h5> | |
738 | <a name="execution_context_operator_lesseq_bridgehead"></a> | |
739 | <span><a name="execution_context_operator_lesseq"></a></span> | |
740 | <a class="link" href="econtext.html#execution_context_operator_lesseq">Member | |
741 | function <code class="computeroutput">operator<=</code>()</a> | |
742 | </h5> | |
743 | <p> | |
744 | </p> | |
745 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
746 | </pre> | |
747 | <div class="variablelist"> | |
748 | <p class="title"><b></b></p> | |
749 | <dl> | |
750 | <dt><span class="term">Returns:</span></dt> | |
751 | <dd><p> | |
752 | <code class="computeroutput"><span class="special">!</span> <span class="special">(</span><span class="identifier">other</span> <span class="special"><</span> | |
753 | <span class="special">*</span> <span class="keyword">this</span><span class="special">)</span></code> | |
754 | </p></dd> | |
755 | <dt><span class="term">Throws:</span></dt> | |
756 | <dd><p> | |
757 | Nothing. | |
758 | </p></dd> | |
759 | </dl> | |
760 | </div> | |
761 | <p> | |
762 | </p> | |
763 | <h5> | |
764 | <a name="execution_context_operator_greatereq_bridgehead"></a> | |
765 | <span><a name="execution_context_operator_greatereq"></a></span> | |
766 | <a class="link" href="econtext.html#execution_context_operator_greatereq">Member | |
767 | function <code class="computeroutput">operator>=</code>()</a> | |
768 | </h5> | |
769 | <p> | |
770 | </p> | |
771 | <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">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span> | |
772 | </pre> | |
773 | <div class="variablelist"> | |
774 | <p class="title"><b></b></p> | |
775 | <dl> | |
776 | <dt><span class="term">Returns:</span></dt> | |
777 | <dd><p> | |
778 | <code class="computeroutput"><span class="special">!</span> <span class="special">(*</span> | |
779 | <span class="keyword">this</span> <span class="special"><</span> | |
780 | <span class="identifier">other</span><span class="special">)</span></code> | |
781 | </p></dd> | |
782 | <dt><span class="term">Throws:</span></dt> | |
783 | <dd><p> | |
784 | Nothing. | |
785 | </p></dd> | |
786 | </dl> | |
787 | </div> | |
788 | <p> | |
789 | </p> | |
790 | <h5> | |
791 | <a name="execution_context_bridgehead"></a> | |
792 | <span><a name="execution_context"></a></span> | |
793 | <a class="link" href="econtext.html#execution_context">Non-member function | |
794 | <code class="computeroutput">operator<<()</code></a> | |
795 | </h5> | |
796 | <p> | |
797 | </p> | |
798 | <pre class="programlisting"><span class="keyword">template</span><span class="special"><</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">></span> | |
799 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traitsT</span> <span class="special">></span> <span class="special">&</span> | |
800 | <span class="keyword">operator</span><span class="special"><<(</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traitsT</span> <span class="special">></span> <span class="special">&</span> <span class="identifier">os</span><span class="special">,</span> <span class="identifier">execution_context</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">);</span> | |
801 | </pre> | |
802 | <div class="variablelist"> | |
803 | <p class="title"><b></b></p> | |
804 | <dl> | |
805 | <dt><span class="term">Efects:</span></dt> | |
806 | <dd><p> | |
807 | Writes the representation of <code class="computeroutput"><span class="identifier">other</span></code> | |
808 | to stream <code class="computeroutput"><span class="identifier">os</span></code>. | |
809 | </p></dd> | |
810 | <dt><span class="term">Returns:</span></dt> | |
811 | <dd><p> | |
812 | <code class="computeroutput"><span class="identifier">os</span></code> | |
813 | </p></dd> | |
814 | </dl> | |
815 | </div> | |
816 | </div> | |
817 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
818 | <td align="left"></td> | |
819 | <td align="right"><div class="copyright-footer">Copyright © 2014 Oliver Kowalke<p> | |
820 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
821 | 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>) | |
822 | </p> | |
823 | </div></td> | |
824 | </tr></table> | |
825 | <hr> | |
826 | <div class="spirit-nav"> | |
827 | <a accesskey="p" href="requirements.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="ccontext.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> | |
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830 | </html> |