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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h3 class="title"> | |
27 | <a name="fiber.stack.fixedsize"></a><a name="class_fixedsize_stack"></a><a class="link" href="fixedsize.html" title="Class fixedsize_stack">Class | |
28 | <span class="emphasis"><em>fixedsize_stack</em></span></a> | |
29 | </h3></div></div></div> | |
30 | <p> | |
31 | <span class="bold"><strong>Boost.Fiber</strong></span> provides the class __fixedsize__ | |
32 | which models the <a class="link" href="../stack.html#stack_allocator_concept"><span class="emphasis"><em>stack-allocator | |
33 | concept</em></span></a>. In contrast to __protected_fixedsize__ it does | |
34 | not append a guard page at the end of each stack. The memory is simply managed | |
35 | by <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">malloc</span><span class="special">()</span></code> | |
36 | and <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">free</span><span class="special">()</span></code>. | |
37 | </p> | |
38 | <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_stack</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
39 | ||
40 | <span class="keyword">struct</span> <span class="identifier">fixedsize_stack</span> <span class="special">{</span> | |
41 | <span class="identifier">fixedsize_stack</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> | |
42 | ||
43 | <span class="identifier">stack_context</span> <span class="identifier">allocate</span><span class="special">();</span> | |
44 | ||
45 | <span class="keyword">void</span> <span class="identifier">deallocate</span><span class="special">(</span> <span class="identifier">stack_context</span> <span class="special">&);</span> | |
46 | <span class="special">}</span> | |
47 | </pre> | |
48 | <h5> | |
49 | <a name="fiber.stack.fixedsize.h0"></a> | |
50 | <span><a name="fiber.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#fiber.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> | |
51 | </h5> | |
52 | <div class="variablelist"> | |
53 | <p class="title"><b></b></p> | |
54 | <dl> | |
55 | <dt><span class="term">Preconditions:</span></dt> | |
56 | <dd><p> | |
57 | <code class="computeroutput"><span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">minimum_size</span><span class="special">()</span> | |
58 | <span class="special"><=</span> <span class="identifier">size</span></code> | |
59 | and <code class="computeroutput"><span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">is_unbounded</span><span class="special">()</span> | |
60 | <span class="special">||</span> <span class="special">(</span> | |
61 | <span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">maximum_size</span><span class="special">()</span> | |
62 | <span class="special">>=</span> <span class="identifier">size</span><span class="special">)</span></code>. | |
63 | </p></dd> | |
64 | <dt><span class="term">Effects:</span></dt> | |
65 | <dd><p> | |
66 | Allocates memory of at least <code class="computeroutput"><span class="identifier">size</span></code> | |
67 | 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 | |
68 | (the stack grows downwards/upwards) the stored address is the highest/lowest | |
69 | address of the stack. | |
70 | </p></dd> | |
71 | </dl> | |
72 | </div> | |
73 | <h5> | |
74 | <a name="fiber.stack.fixedsize.h1"></a> | |
75 | <span><a name="fiber.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#fiber.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> | |
76 | <span class="special">&</span> <span class="identifier">sctx</span><span class="special">)</span></code></a> | |
77 | </h5> | |
78 | <div class="variablelist"> | |
79 | <p class="title"><b></b></p> | |
80 | <dl> | |
81 | <dt><span class="term">Preconditions:</span></dt> | |
82 | <dd><p> | |
83 | <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_size</span><span class="special">()</span> <span class="special"><=</span> <span class="identifier">sctx</span><span class="special">.</span><span class="identifier">size</span></code> and <code class="computeroutput"><span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">is_unbounded</span><span class="special">()</span> <span class="special">||</span> <span class="special">(</span> <span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">maximum_size</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">sctx</span><span class="special">.</span><span class="identifier">size</span><span class="special">)</span></code>. | |
84 | </p></dd> | |
85 | <dt><span class="term">Effects:</span></dt> | |
86 | <dd><p> | |
87 | Deallocates the stack space. | |
88 | </p></dd> | |
89 | </dl> | |
90 | </div> | |
91 | </div> | |
92 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
93 | <td align="left"></td> | |
94 | <td align="right"><div class="copyright-footer">Copyright © 2013 Oliver Kowalke<p> | |
95 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
96 | 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>) | |
97 | </p> | |
98 | </div></td> | |
99 | </tr></table> | |
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