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<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_functiontypes.reference.decomposition"></a><a class="link" href="decomposition.html" title="Class templates for type decomposition">Class templates
      for type decomposition</a>
</h3></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.result_type">result_type</a></span></dt>
<dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.parameter_types">parameter_types</a></span></dt>
<dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.function_arity">function_arity</a></span></dt>
<dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.components">components</a></span></dt>
</dl></div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="boost_functiontypes.reference.decomposition.result_type"></a><a class="link" href="decomposition.html#boost_functiontypes.reference.decomposition.result_type" title="result_type">result_type</a>
</h4></div></div></div>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">F</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">result_type</span><span class="special">;</span>
</pre>
<p>
          <span class="bold"><strong>Header</strong></span>
        </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">function_types</span><span class="special">/</span><span class="identifier">result_type</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term"><code class="literal">F</code></span></dt>
<dd><p>
                Type to analyze
              </p></dd>
<dt><span class="term"><code class="literal">result_type&lt;F&gt;::type</code></span></dt>
<dd><p>
                Result type of <code class="literal">F</code>
              </p></dd>
</dl>
</div>
<p>
          Extracts the result type of a callable, builtin type.
        </p>
<p>
          If <code class="literal">F</code> is no callable, builtin type, any attempt to access
          the <code class="literal">type</code> member results in a compile error.
        </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="boost_functiontypes.reference.decomposition.parameter_types"></a><a class="link" href="decomposition.html#boost_functiontypes.reference.decomposition.parameter_types" title="parameter_types">parameter_types</a>
</h4></div></div></div>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">F</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ClassTransform</span> <span class="special">=</span> <span class="identifier">add_reference</span><span class="special">&lt;</span><span class="identifier">_</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">parameter_types</span><span class="special">;</span>
</pre>
<p>
          <span class="bold"><strong>Header</strong></span>
        </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">function_types</span><span class="special">/</span><span class="identifier">parameter_types</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term"><code class="literal">F</code></span></dt>
<dd><p>
                Type to analyze
              </p></dd>
<dt><span class="term"><code class="literal">ClassTransform</code></span></dt>
<dd><p>
                <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/lambda-expression.html" target="_top">Lambda
                Expression</a> to transform the class type if <code class="literal">F</code>
                is a member function pointer
              </p></dd>
<dt><span class="term"><code class="literal">parameter_types&lt;F,ClassTransform&gt;</code></span></dt>
<dd><p>
                <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/front-extensible-sequence.html" target="_top">Front</a>
                / <a href="../../../../../mpl/doc/refmanual/back-extensible-sequence.html" target="_top">Back
                </a><a href="../../../../../mpl/doc/refmanual/extensible-sequence.html" target="_top">Extensible
                </a><a href="../../../../../mpl/doc/refmanual/random-access-sequence.html" target="_top">Random
                Access Sequence</a> of parameter types
              </p></dd>
</dl>
</div>
<p>
          Extracts the parameter types of a callable, builtin type.
        </p>
<p>
          If <code class="literal">F</code> is no callable, builtin type, any attempt to access
          the sequence results in a compile error.
        </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="boost_functiontypes.reference.decomposition.function_arity"></a><a class="link" href="decomposition.html#boost_functiontypes.reference.decomposition.function_arity" title="function_arity">function_arity</a>
</h4></div></div></div>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">F</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">function_arity</span><span class="special">;</span>
</pre>
<p>
          <span class="bold"><strong>Header</strong></span>
        </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">function_types</span><span class="special">/</span><span class="identifier">function_arity</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term"><code class="literal">F</code></span></dt>
<dd><p>
                Callable builtin type
              </p></dd>
<dt><span class="term"><code class="literal">function_arity&lt;F&gt;</code></span></dt>
<dd><p>
                Function arity as <a href="../../../../../mpl/index.html" target="_top">MPL</a>
                - <a href="../../../../../mpl/doc/refmanual/integral-constant.html" target="_top">Integral
                Constant</a>
              </p></dd>
<dt><span class="term"><code class="literal">function_arity&lt;F&gt;::value</code></span></dt>
<dd><p>
                Constant value of the function arity
              </p></dd>
</dl>
</div>
<p>
          Extracts the function arity, that is the number of parameters. The hidden
          <code class="literal">this</code> of member function pointers counts, in other words
          the arity value is always greater than or equal to one if <code class="literal">F</code>
          is a member function pointer.
        </p>
<p>
          If <code class="literal">F</code> is no callable, builtin type, any attempt to access
          the value results in a compile error.
        </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="boost_functiontypes.reference.decomposition.components"></a><a class="link" href="decomposition.html#boost_functiontypes.reference.decomposition.components" title="components">components</a>
</h4></div></div></div>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ClassTransform</span> <span class="special">=</span> <span class="identifier">add_reference</span><span class="special">&lt;</span><span class="identifier">_</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">components</span><span class="special">;</span>
</pre>
<p>
          <span class="bold"><strong>Header</strong></span>
        </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">function_types</span><span class="special">/</span><span class="identifier">components</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term"><code class="literal">T</code></span></dt>
<dd><p>
                Type to analyze
              </p></dd>
<dt><span class="term"><code class="literal">ClassTransform</code></span></dt>
<dd><p>
                <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/lambda-expression.html" target="_top">Lambda
                Expression</a> to transform the class type if <code class="literal">T</code>
                is a member function pointer
              </p></dd>
<dt><span class="term"><code class="literal">components&lt;T,ClassTransform&gt;</code></span></dt>
<dd><p>
                <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/front-extensible-sequence.html" target="_top">Front</a>
                / <a href="../../../../../mpl/doc/refmanual/back-extensible-sequence.html" target="_top">Back
                </a><a href="../../../../../mpl/doc/refmanual/extensible-sequence.html" target="_top">Extensible
                </a><a href="../../../../../mpl/doc/refmanual/random-access-sequence.html" target="_top">Random
                Access Sequence</a> of all component types and property tag
              </p></dd>
<dt><span class="term"><code class="literal">components&lt;T,ClassTransform&gt;::types</code></span></dt>
<dd><p>
                Decorated MPL Sequence, exposed for optimization
              </p></dd>
</dl>
</div>
<p>
          Extracts all properties of a callable builtin type, that is the result
          type, followed by the parameter types (including the type of <code class="literal">this</code>
          for member function pointers).
        </p>
<p>
          If <code class="literal">T</code> is no callable builtin type, the component types
          are an empty sequence and the Tag's meaning is equivalent to the <code class="literal"><a class="link" href="tag_types.html#boost_functiontypes.reference.tag_types.null_tag" title="null_tag">null_tag</a></code>.
        </p>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2004-2007 Tobias
      Schwinger<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        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>)
      </p>
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