ceph/src/boost/libs/mpl/doc/refmanual/limit-map-size.html

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  14 <div class="section" id="boost-mpl-limit-map-size">
  15 <h1><a class="toc-backref" href="./configuration.html#id1605">BOOST_MPL_LIMIT_MAP_SIZE</a></h1>
  16 <div class="section" id="id1371">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 #if !defined(<a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a>)
  20 #   define <a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a> \
  21         <em>implementation-defined integral constant</em> \
  22 /**/
  23 #endif
  24 </pre>
  25 </div>
  26 <div class="section" id="id1372">
  27 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  28 <p><tt class="literal"><span class="pre"><a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a></span></tt> is an overridable configuration macro regulating
  29 the maximum arity of the <tt class="literal"><span class="pre"><a href="./map.html" class="identifier">map</a></span></tt>'s <a class="reference internal" href="./variadic-sequence.html">variadic form</a>. In this
  30 implementation of the library, <tt class="literal"><span class="pre"><a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a></span></tt> has a default value
  31 of 20. To override the default limit, define <tt class="literal"><span class="pre"><a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a></span></tt> to
  32 the desired maximum arity rounded up to the nearest multiple of ten before
  33 including any library header. [<em>Note:</em> Overriding will take effect
  34 <em>only</em> if the library is configured not to use <a class="reference internal" href="./cfg-no-preprocessed-headers.html#boost-mpl-cfg-no-preprocessed">preprocessed headers</a>. See
  35 <a class="reference internal" href="./cfg-no-preprocessed-headers.html">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</a> for more information. — <em>end note</em>]</p>
  36 </div>
  37 <div class="section" id="id1374">
  38 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
  39 <pre class="literal-block">
  40 #define <a href="./cfg-no-preprocessed-headers.html" class="identifier">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</a>
  41 #define <a href="./limit-map-size.html" class="identifier">BOOST_MPL_LIMIT_MAP_SIZE</a> 10
  42 <tt class="literal"><span class="pre">#</span></tt>include &lt;boost/mpl/<a href="./map.html" class="identifier">map</a>.hpp&gt;
  43 <tt class="literal"><span class="pre">#</span></tt>include &lt;boost/mpl/<a href="./pair.html" class="identifier">pair</a>.hpp&gt;
  44 <tt class="literal"><span class="pre">#</span></tt>include &lt;boost/mpl/int.hpp&gt;
  45
  46 using namespace boost::mpl;
  47
  48 template&lt; int i &gt; struct ints : <a href="./pair.html" class="identifier">pair</a>&lt; <a href="./int.html" class="identifier">int_</a>&lt;i&gt;,<a href="./int.html" class="identifier">int_</a>&lt;i&gt; &gt; {};
  49
  50 typedef <a href="./map.html" class="identifier">map</a>&lt; ints&lt;1&gt; &gt; m_1;
  51 typedef <a href="./map.html" class="identifier">map</a>&lt; ints&lt;1&gt;, ints&lt;2&gt;, ints&lt;3&gt;, ints&lt;4&gt;, ints&lt;5&gt;
  52     ints&lt;6&gt;, ints&lt;7&gt;, ints&lt;8&gt;, ints&lt;9&gt;, ints&lt;10&gt; &gt; m_10;
  53
  54 // typedef <a href="./map.html" class="identifier">map</a>&lt; ints&lt;1&gt;, ints&lt;2&gt;, ints&lt;3&gt;, ints&lt;4&gt;, ints&lt;5&gt;
  55 //     ints&lt;6&gt;, ints&lt;7&gt;, ints&lt;8&gt;, ints&lt;9&gt;, ints&lt;10&gt;, ints&lt;11&gt; &gt; m_11; // error!
  56 </pre>
  57 </div>
  58 <div class="section" id="id1375">
  59 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
  60 <p><a class="reference internal" href="./configuration.html">Configuration</a>, <a class="reference internal" href="./cfg-no-preprocessed-headers.html">BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS</a>, <a class="reference internal" href="./limit-set-size.html">BOOST_MPL_LIMIT_SET_SIZE</a></p>
  61 <!-- Macros/Configuration//BOOST_MPL_LIMIT_STRING_SIZE |65 -->
  62 </div>
  63 </div>
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