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<title>Class stack_traits</title>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="context.stack.stack_traits"></a><a class="link" href="stack_traits.html" title="Class stack_traits">Class <span class="emphasis"><em>stack_traits</em></span></a>
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</h3></div></div></div>
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<p>
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<span class="emphasis"><em>stack_traits</em></span> models a <span class="emphasis"><em>stack-traits</em></span>
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providing a way to access certain properites defined by the enironment. Stack
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allocators use <span class="emphasis"><em>stack-traits</em></span> to allocate stacks.
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</p>
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<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">stack_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">stack_traits</span> <span class="special">{</span>
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<span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">is_unbounded</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span>
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<span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">page_size</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span>
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<span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">default_size</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span>
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<span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">minimum_size</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span>
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<span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">maximum_size</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span>
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<span class="special">}</span>
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</pre>
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<h5>
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<a name="context.stack.stack_traits.h0"></a>
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<span class="phrase"><a name="context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__keyword__bool__phrase___phrase_role__identifier__is_unbounded__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="stack_traits.html#context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__keyword__bool__phrase___phrase_role__identifier__is_unbounded__phrase__phrase_role__special______phrase___code_"><code class="computeroutput"><span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">is_unbounded</span><span class="special">()</span></code></a>
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</h5>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl class="variablelist">
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<dt><span class="term">Returns:</span></dt>
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<dd><p>
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Returns <code class="computeroutput"><span class="keyword">true</span></code> if the environment
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defines no limit for the size of a stack.
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</p></dd>
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<dt><span class="term">Throws:</span></dt>
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<dd><p>
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Nothing.
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</p></dd>
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</dl>
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</div>
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<h5>
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<a name="context.stack.stack_traits.h1"></a>
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<span class="phrase"><a name="context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__page_size__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="stack_traits.html#context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__page_size__phrase__phrase_role__special______phrase___code_"><code class="computeroutput"><span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">page_size</span><span class="special">()</span></code></a>
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</h5>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl class="variablelist">
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<dt><span class="term">Returns:</span></dt>
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<dd><p>
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Returns the page size in bytes.
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</p></dd>
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<dt><span class="term">Throws:</span></dt>
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<dd><p>
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Nothing.
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</p></dd>
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</dl>
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</div>
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<h5>
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<a name="context.stack.stack_traits.h2"></a>
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<span class="phrase"><a name="context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__default_size__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="stack_traits.html#context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__default_size__phrase__phrase_role__special______phrase___code_"><code class="computeroutput"><span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">default_size</span><span class="special">()</span></code></a>
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</h5>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl class="variablelist">
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<dt><span class="term">Returns:</span></dt>
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<dd><p>
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Returns a default stack size, which may be platform specific. If the
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stack is unbounded then the present implementation returns the maximum
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of <code class="computeroutput"><span class="number">64</span> <span class="identifier">kB</span></code>
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and <code class="computeroutput"><span class="identifier">minimum_size</span><span class="special">()</span></code>.
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</p></dd>
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<dt><span class="term">Throws:</span></dt>
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<dd><p>
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Nothing.
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</p></dd>
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</dl>
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</div>
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<h5>
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<a name="context.stack.stack_traits.h3"></a>
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<span class="phrase"><a name="context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__minimum_size__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="stack_traits.html#context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__minimum_size__phrase__phrase_role__special______phrase___code_"><code class="computeroutput"><span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">minimum_size</span><span class="special">()</span></code></a>
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</h5>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl class="variablelist">
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<dt><span class="term">Returns:</span></dt>
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<dd><p>
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Returns the minimum size in bytes of stack defined by the environment
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(Win32 4kB/Win64 8kB, defined by rlimit on POSIX).
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</p></dd>
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<dt><span class="term">Throws:</span></dt>
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<dd><p>
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Nothing.
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</p></dd>
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</dl>
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</div>
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<h5>
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<a name="context.stack.stack_traits.h4"></a>
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<span class="phrase"><a name="context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__maximum_size__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="stack_traits.html#context.stack.stack_traits._code__phrase_role__keyword__static__phrase___phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__maximum_size__phrase__phrase_role__special______phrase___code_"><code class="computeroutput"><span class="keyword">static</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">maximum_size</span><span class="special">()</span></code></a>
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</h5>
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<div class="variablelist">
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<p class="title"><b></b></p>
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<dl class="variablelist">
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<dt><span class="term">Preconditions:</span></dt>
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<dd><p>
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<code class="computeroutput"><span class="identifier">is_unbounded</span><span class="special">()</span></code>
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returns <code class="computeroutput"><span class="keyword">false</span></code>.
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</p></dd>
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<dt><span class="term">Returns:</span></dt>
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<dd><p>
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Returns the maximum size in bytes of stack defined by the environment.
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</p></dd>
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<dt><span class="term">Throws:</span></dt>
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<dd><p>
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Nothing.
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</p></dd>
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</dl>
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</div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2014 Oliver Kowalke<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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