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26 <div class="titlepage"><div><div><h4 class="title">
27 <a name="context.abstract_context.stack.fixedsize"></a><a class="link" href="fixedsize.html" title="Class fixedsize_stack">Class <span class="emphasis"><em>fixedsize_stack</em></span></a>
28 </h4></div></div></div>
30 <span class="bold"><strong>Boost.Context</strong></span> provides the class <span class="emphasis"><em>fixedsize_stack</em></span>
31 which models the <span class="emphasis"><em>stack-allocator concept</em></span>. In contrast
32 to <span class="emphasis"><em>protected_fixedsize_stack</em></span> it does not append a
33 guard page 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>.
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_stack</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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_stack</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>
43 <span class="identifier">basic_fixesize_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>
45 <span class="identifier">stack_context</span> <span class="identifier">allocate</span><span class="special">();</span>
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>
50 <span class="keyword">typedef</span> <span class="identifier">basic_fixedsize_stack</span><span class="special"><</span> <span class="identifier">stack_traits</span> <span class="special">></span> <span class="identifier">fixedsize_stack</span><span class="special">;</span>
53 <a name="context.abstract_context.stack.fixedsize.h0"></a>
54 <span><a name="context.abstract_context.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.abstract_context.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>
56 <div class="variablelist">
57 <p class="title"><b></b></p>
59 <dt><span class="term">Preconditions:</span></dt>
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>.
67 <dt><span class="term">Effects:</span></dt>
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
77 <a name="context.abstract_context.stack.fixedsize.h1"></a>
78 <span><a name="context.abstract_context.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.abstract_context.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>
81 <div class="variablelist">
82 <p class="title"><b></b></p>
84 <dt><span class="term">Preconditions:</span></dt>
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>.
93 <dt><span class="term">Effects:</span></dt>
95 Deallocates the stack space.
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>)
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