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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h4 class="title"> | |
27 | <a name="context.econtext.stack.fixedsize"></a><a class="link" href="fixedsize.html" title="Class fixedsize">Class <span class="emphasis"><em>fixedsize</em></span></a> | |
28 | </h4></div></div></div> | |
29 | <p> | |
30 | __boost_coroutine__ provides the class <span class="emphasis"><em>fixedsize</em></span> which | |
31 | models the <span class="emphasis"><em>stack-allocator concept</em></span>. In contrast to | |
32 | <span class="emphasis"><em>protected_fixedsize</em></span> it does not append a guard page | |
33 | at the end of each stack. The memory is simply managed by <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">malloc</span><span class="special">()</span></code> | |
34 | and <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">free</span><span class="special">()</span></code>. | |
35 | </p> | |
36 | <pre class="programlisting"><span class="preprocessor">#include</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">fixedsize</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
37 | ||
38 | <span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">traitsT</span> <span class="special">></span> | |
39 | <span class="keyword">struct</span> <span class="identifier">basic_fixedsize</span> | |
40 | <span class="special">{</span> | |
41 | <span class="keyword">typedef</span> <span class="identifier">traitT</span> <span class="identifier">traits_type</span><span class="special">;</span> | |
42 | ||
43 | <span class="identifier">basic_fixesize</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">traits_type</span><span class="special">::</span><span class="identifier">default_size</span><span class="special">());</span> | |
44 | ||
45 | <span class="identifier">stack_context</span> <span class="identifier">allocate</span><span class="special">();</span> | |
46 | ||
47 | <span class="keyword">void</span> <span class="identifier">deallocate</span><span class="special">(</span> <span class="identifier">stack_context</span> <span class="special">&);</span> | |
48 | <span class="special">}</span> | |
49 | ||
50 | <span class="keyword">typedef</span> <span class="identifier">basic_fixedsize</span><span class="special"><</span> <span class="identifier">stack_traits</span> <span class="special">></span> <span class="identifier">fixedsize</span> | |
51 | </pre> | |
52 | <h6> | |
53 | <a name="context.econtext.stack.fixedsize.h0"></a> | |
54 | <span><a name="context.econtext.stack.fixedsize._code__phrase_role__identifier__stack_context__phrase___phrase_role__identifier__allocate__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="fixedsize.html#context.econtext.stack.fixedsize._code__phrase_role__identifier__stack_context__phrase___phrase_role__identifier__allocate__phrase__phrase_role__special______phrase___code_"><code class="computeroutput"><span class="identifier">stack_context</span> <span class="identifier">allocate</span><span class="special">()</span></code></a> | |
55 | </h6> | |
56 | <div class="variablelist"> | |
57 | <p class="title"><b></b></p> | |
58 | <dl> | |
59 | <dt><span class="term">Preconditions:</span></dt> | |
60 | <dd><p> | |
61 | <code class="computeroutput"><span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">minimum</span><span class="special">:</span><span class="identifier">size</span><span class="special">()</span> | |
62 | <span class="special"><=</span> <span class="identifier">size</span></code> | |
63 | and <code class="computeroutput"><span class="special">!</span> <span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">is_unbounded</span><span class="special">()</span> <span class="special">&&</span> | |
64 | <span class="special">(</span> <span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">maximum</span><span class="special">:</span><span class="identifier">size</span><span class="special">()</span> <span class="special">>=</span> | |
65 | <span class="identifier">size</span><span class="special">)</span></code>. | |
66 | </p></dd> | |
67 | <dt><span class="term">Effects:</span></dt> | |
68 | <dd><p> | |
69 | Allocates memory of at least <code class="computeroutput"><span class="identifier">size</span></code> | |
70 | Bytes and stores a pointer to the stack and its actual size in <code class="computeroutput"><span class="identifier">sctx</span></code>. Depending on the architecture | |
71 | (the stack grows downwards/upwards) the stored address is the highest/lowest | |
72 | address of the stack. | |
73 | </p></dd> | |
74 | </dl> | |
75 | </div> | |
76 | <h6> | |
77 | <a name="context.econtext.stack.fixedsize.h1"></a> | |
78 | <span><a name="context.econtext.stack.fixedsize._code__phrase_role__keyword__void__phrase___phrase_role__identifier__deallocate__phrase__phrase_role__special_____phrase___phrase_role__identifier__stack_context__phrase___phrase_role__special___amp___phrase___phrase_role__identifier__sctx__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="fixedsize.html#context.econtext.stack.fixedsize._code__phrase_role__keyword__void__phrase___phrase_role__identifier__deallocate__phrase__phrase_role__special_____phrase___phrase_role__identifier__stack_context__phrase___phrase_role__special___amp___phrase___phrase_role__identifier__sctx__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="keyword">void</span> <span class="identifier">deallocate</span><span class="special">(</span> <span class="identifier">stack_context</span> | |
79 | <span class="special">&</span> <span class="identifier">sctx</span><span class="special">)</span></code></a> | |
80 | </h6> | |
81 | <div class="variablelist"> | |
82 | <p class="title"><b></b></p> | |
83 | <dl> | |
84 | <dt><span class="term">Preconditions:</span></dt> | |
85 | <dd><p> | |
86 | <code class="computeroutput"><span class="identifier">sctx</span><span class="special">.</span><span class="identifier">sp</span></code> is valid, <code class="computeroutput"><span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">minimum</span><span class="special">:</span><span class="identifier">size</span><span class="special">()</span> <span class="special"><=</span> | |
87 | <span class="identifier">sctx</span><span class="special">.</span><span class="identifier">size</span></code> and <code class="computeroutput"><span class="special">!</span> | |
88 | <span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">is_unbounded</span><span class="special">()</span> | |
89 | <span class="special">&&</span> <span class="special">(</span> | |
90 | <span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">maximum</span><span class="special">:</span><span class="identifier">size</span><span class="special">()</span> | |
91 | <span class="special">>=</span> <span class="identifier">sctx</span><span class="special">.</span><span class="identifier">size</span><span class="special">)</span></code>. | |
92 | </p></dd> | |
93 | <dt><span class="term">Effects:</span></dt> | |
94 | <dd><p> | |
95 | Deallocates the stack space. | |
96 | </p></dd> | |
97 | </dl> | |
98 | </div> | |
99 | </div> | |
100 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
101 | <td align="left"></td> | |
102 | <td align="right"><div class="copyright-footer">Copyright © 2014 Oliver Kowalke<p> | |
103 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
104 | 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>) | |
105 | </p> | |
106 | </div></td> | |
107 | </tr></table> | |
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