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<a name="boost.interprocess.mapped_region.advice_types"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Type advice_types</span></h2>
<p>boost::interprocess::mapped_region::advice_types</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../../interprocess/indexes_reference.html#header.boost.interprocess.mapped_region_hpp" title="Header &lt;boost/interprocess/mapped_region.hpp&gt;">boost/interprocess/mapped_region.hpp</a>&gt;

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<span class="keyword">enum</span> <span class="identifier">advice_types</span> <span class="special">{</span> <a class="link" href="advice_types.html#boost.interprocess.mapped_region.advice_types.advice_normal">advice_normal</a>, <a class="link" href="advice_types.html#boost.interprocess.mapped_region.advice_types.advice_sequential">advice_sequential</a>, <a class="link" href="advice_types.html#boost.interprocess.mapped_region.advice_types.advice_random">advice_random</a>, 
                    <a class="link" href="advice_types.html#boost.interprocess.mapped_region.advice_types.advice_willneed">advice_willneed</a>, <a class="link" href="advice_types.html#boost.interprocess.mapped_region.advice_types.advice_dontneed">advice_dontneed</a> <span class="special">}</span><span class="special">;</span></pre></div>
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<a name="idp276806080"></a><h2>Description</h2>
<p>This enum specifies region usage behaviors that an application can specify to the mapped region implementation. </p>
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<dt><span class="term"><code class="computeroutput">advice_normal</code><a name="boost.interprocess.mapped_region.advice_types.advice_normal"></a></span></dt>
<dd><p>Specifies that the application has no advice to give on its behavior with respect to the region. It is the default characteristic if no advice is given for a range of memory. </p></dd>
<dt><span class="term"><code class="computeroutput">advice_sequential</code><a name="boost.interprocess.mapped_region.advice_types.advice_sequential"></a></span></dt>
<dd><p>Specifies that the application expects to access the region sequentially from lower addresses to higher addresses. The implementation can lower the priority of preceding pages within the region once a page have been accessed. </p></dd>
<dt><span class="term"><code class="computeroutput">advice_random</code><a name="boost.interprocess.mapped_region.advice_types.advice_random"></a></span></dt>
<dd><p>Specifies that the application expects to access the region in a random order, and prefetching is likely not advantageous. </p></dd>
<dt><span class="term"><code class="computeroutput">advice_willneed</code><a name="boost.interprocess.mapped_region.advice_types.advice_willneed"></a></span></dt>
<dd><p>Specifies that the application expects to access the region in the near future. The implementation can prefetch pages of the region. </p></dd>
<dt><span class="term"><code class="computeroutput">advice_dontneed</code><a name="boost.interprocess.mapped_region.advice_types.advice_dontneed"></a></span></dt>
<dd><p>Specifies that the application expects that it will not access the region in the near future. The implementation can unload pages within the range to save system resources. </p></dd>
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