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4 | <title>Class pooled_fixedsize_stack</title> | |
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24 | </div> | |
25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h3 class="title"> | |
27 | <a name="context.stack.pooled_fixedsize"></a><a class="link" href="pooled_fixedsize.html" title="Class pooled_fixedsize_stack">Class <span class="emphasis"><em>pooled_fixedsize_stack</em></span></a> | |
28 | </h3></div></div></div> | |
29 | <p> | |
30 | <span class="bold"><strong>Boost.Context</strong></span> provides the class <span class="emphasis"><em>pooled_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 guard | |
33 | page at the end of each stack. The memory is managed internally by <a href="http://www.boost.org/doc/libs/release/libs/pool/doc/html/boost/pool.html" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">pool</span><span class="special"><></span></code></a>. | |
34 | </p> | |
35 | <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">pooled_fixedsize_stack</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
36 | ||
37 | <span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">traitsT</span> <span class="special">></span> | |
38 | <span class="keyword">struct</span> <span class="identifier">basic_pooled_fixedsize_stack</span> <span class="special">{</span> | |
39 | <span class="keyword">typedef</span> <span class="identifier">traitT</span> <span class="identifier">traits_type</span><span class="special">;</span> | |
40 | ||
41 | <span class="identifier">basic_pooled_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">stack_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> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">next_size</span> <span class="special">=</span> <span class="number">32</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">max_size</span> <span class="special">=</span> <span class="number">0</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 | ||
48 | <span class="keyword">typedef</span> <span class="identifier">basic_pooled_fixedsize_stack</span><span class="special"><</span> <span class="identifier">stack_traits</span> <span class="special">></span> <span class="identifier">pooled_fixedsize_stack</span><span class="special">;</span> | |
49 | </pre> | |
50 | <h5> | |
51 | <a name="context.stack.pooled_fixedsize.h0"></a> | |
52 | <span><a name="context.stack.pooled_fixedsize._code__phrase_role__identifier__basic_pooled_fixedsize_stack__phrase__phrase_role__special_____phrase__phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__stack_size__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__next_size__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__max_size__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="pooled_fixedsize.html#context.stack.pooled_fixedsize._code__phrase_role__identifier__basic_pooled_fixedsize_stack__phrase__phrase_role__special_____phrase__phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__stack_size__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__next_size__phrase__phrase_role__special_____phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__max_size__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="identifier">basic_pooled_fixedsize_stack</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> | |
53 | <span class="identifier">stack_size</span><span class="special">,</span> | |
54 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">next_size</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">max_size</span><span class="special">)</span></code></a> | |
55 | </h5> | |
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="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> | |
62 | <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> <span class="identifier">stack_size</span><span class="special">)</span></code> | |
63 | and <code class="computeroutput"><span class="number">0</span> <span class="special"><</span> | |
64 | <span class="identifier">nest_size</span></code>. | |
65 | </p></dd> | |
66 | <dt><span class="term">Effects:</span></dt> | |
67 | <dd><p> | |
68 | Allocates memory of at least <code class="computeroutput"><span class="identifier">stack_size</span></code> | |
69 | 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 | |
70 | (the stack grows downwards/upwards) the stored address is the highest/lowest | |
71 | address of the stack. Argument <code class="computeroutput"><span class="identifier">next_size</span></code> | |
72 | determines the number of stacks to request from the system the first | |
73 | time that <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> | |
74 | needs to allocate system memory. The third argument <code class="computeroutput"><span class="identifier">max_size</span></code> | |
75 | controls how many memory might be allocated for stacks - a value of | |
76 | zero means no uper limit. | |
77 | </p></dd> | |
78 | </dl> | |
79 | </div> | |
80 | <h5> | |
81 | <a name="context.stack.pooled_fixedsize.h1"></a> | |
82 | <span><a name="context.stack.pooled_fixedsize._code__phrase_role__identifier__stack_context__phrase___phrase_role__identifier__allocate__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="pooled_fixedsize.html#context.stack.pooled_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> | |
83 | </h5> | |
84 | <div class="variablelist"> | |
85 | <p class="title"><b></b></p> | |
86 | <dl> | |
87 | <dt><span class="term">Preconditions:</span></dt> | |
88 | <dd><p> | |
89 | <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> | |
90 | <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> <span class="identifier">stack_size</span><span class="special">)</span></code>. | |
91 | </p></dd> | |
92 | <dt><span class="term">Effects:</span></dt> | |
93 | <dd><p> | |
94 | Allocates memory of at least <code class="computeroutput"><span class="identifier">stack_size</span></code> | |
95 | 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 | |
96 | (the stack grows downwards/upwards) the stored address is the highest/lowest | |
97 | address of the stack. | |
98 | </p></dd> | |
99 | </dl> | |
100 | </div> | |
101 | <h5> | |
102 | <a name="context.stack.pooled_fixedsize.h2"></a> | |
103 | <span><a name="context.stack.pooled_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="pooled_fixedsize.html#context.stack.pooled_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> | |
104 | <span class="special">&</span> <span class="identifier">sctx</span><span class="special">)</span></code></a> | |
105 | </h5> | |
106 | <div class="variablelist"> | |
107 | <p class="title"><b></b></p> | |
108 | <dl> | |
109 | <dt><span class="term">Preconditions:</span></dt> | |
110 | <dd><p> | |
111 | <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="special">!</span> | |
112 | <span class="identifier">traits_type</span><span class="special">::</span><span class="identifier">is_unbounded</span><span class="special">()</span> | |
113 | <span class="special">&&</span> <span class="special">(</span> | |
114 | <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> | |
115 | <span class="special">>=</span> <span class="identifier">sctx</span><span class="special">.</span><span class="identifier">size</span><span class="special">)</span></code>. | |
116 | </p></dd> | |
117 | <dt><span class="term">Effects:</span></dt> | |
118 | <dd><p> | |
119 | Deallocates the stack space. | |
120 | </p></dd> | |
121 | </dl> | |
122 | </div> | |
123 | </div> | |
124 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
125 | <td align="left"></td> | |
126 | <td align="right"><div class="copyright-footer">Copyright © 2014 Oliver Kowalke<p> | |
127 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
128 | 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>) | |
129 | </p> | |
130 | </div></td> | |
131 | </tr></table> | |
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133 | <div class="spirit-nav"> | |
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