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4<title>Class templates for type decomposition</title>
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24</div>
25<div class="section">
26<div class="titlepage"><div><div><h3 class="title">
27<a name="boost_functiontypes.reference.decomposition"></a><a class="link" href="decomposition.html" title="Class templates for type decomposition">Class templates
28 for type decomposition</a>
29</h3></div></div></div>
30<div class="toc"><dl>
31<dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.result_type">result_type</a></span></dt>
32<dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.parameter_types">parameter_types</a></span></dt>
33<dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.function_arity">function_arity</a></span></dt>
34<dt><span class="section"><a href="decomposition.html#boost_functiontypes.reference.decomposition.components">components</a></span></dt>
35</dl></div>
36<div class="section">
37<div class="titlepage"><div><div><h4 class="title">
38<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>
39</h4></div></div></div>
40<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>
41<span class="keyword">struct</span> <span class="identifier">result_type</span><span class="special">;</span>
42</pre>
43<p>
44 <span class="bold"><strong>Header</strong></span>
45 </p>
46<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>
47</pre>
48<div class="variablelist">
49<p class="title"><b></b></p>
50<dl>
51<dt><span class="term"><code class="literal">F</code></span></dt>
52<dd><p>
53 Type to analyze
54 </p></dd>
55<dt><span class="term"><code class="literal">result_type&lt;F&gt;::type</code></span></dt>
56<dd><p>
57 Result type of <code class="literal">F</code>
58 </p></dd>
59</dl>
60</div>
61<p>
62 Extracts the result type of a callable, builtin type.
63 </p>
64<p>
65 If <code class="literal">F</code> is no callable, builtin type, any attempt to access
66 the <code class="literal">type</code> member results in a compile error.
67 </p>
68</div>
69<div class="section">
70<div class="titlepage"><div><div><h4 class="title">
71<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>
72</h4></div></div></div>
73<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>
74<span class="keyword">struct</span> <span class="identifier">parameter_types</span><span class="special">;</span>
75</pre>
76<p>
77 <span class="bold"><strong>Header</strong></span>
78 </p>
79<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>
80</pre>
81<div class="variablelist">
82<p class="title"><b></b></p>
83<dl>
84<dt><span class="term"><code class="literal">F</code></span></dt>
85<dd><p>
86 Type to analyze
87 </p></dd>
88<dt><span class="term"><code class="literal">ClassTransform</code></span></dt>
89<dd><p>
90 <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/lambda-expression.html" target="_top">Lambda
91 Expression</a> to transform the class type if <code class="literal">F</code>
92 is a member function pointer
93 </p></dd>
94<dt><span class="term"><code class="literal">parameter_types&lt;F,ClassTransform&gt;</code></span></dt>
95<dd><p>
96 <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/front-extensible-sequence.html" target="_top">Front</a>
97 / <a href="../../../../../mpl/doc/refmanual/back-extensible-sequence.html" target="_top">Back
98 </a><a href="../../../../../mpl/doc/refmanual/extensible-sequence.html" target="_top">Extensible
99 </a><a href="../../../../../mpl/doc/refmanual/random-access-sequence.html" target="_top">Random
100 Access Sequence</a> of parameter types
101 </p></dd>
102</dl>
103</div>
104<p>
105 Extracts the parameter types of a callable, builtin type.
106 </p>
107<p>
108 If <code class="literal">F</code> is no callable, builtin type, any attempt to access
109 the sequence results in a compile error.
110 </p>
111</div>
112<div class="section">
113<div class="titlepage"><div><div><h4 class="title">
114<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>
115</h4></div></div></div>
116<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>
117<span class="keyword">struct</span> <span class="identifier">function_arity</span><span class="special">;</span>
118</pre>
119<p>
120 <span class="bold"><strong>Header</strong></span>
121 </p>
122<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>
123</pre>
124<div class="variablelist">
125<p class="title"><b></b></p>
126<dl>
127<dt><span class="term"><code class="literal">F</code></span></dt>
128<dd><p>
129 Callable builtin type
130 </p></dd>
131<dt><span class="term"><code class="literal">function_arity&lt;F&gt;</code></span></dt>
132<dd><p>
133 Function arity as <a href="../../../../../mpl/index.html" target="_top">MPL</a>
134 - <a href="../../../../../mpl/doc/refmanual/integral-constant.html" target="_top">Integral
135 Constant</a>
136 </p></dd>
137<dt><span class="term"><code class="literal">function_arity&lt;F&gt;::value</code></span></dt>
138<dd><p>
139 Constant value of the function arity
140 </p></dd>
141</dl>
142</div>
143<p>
144 Extracts the function arity, that is the number of parameters. The hidden
145 <code class="literal">this</code> of member function pointers counts, in other words
146 the arity value is always greater than or equal to one if <code class="literal">F</code>
147 is a member function pointer.
148 </p>
149<p>
150 If <code class="literal">F</code> is no callable, builtin type, any attempt to access
151 the value results in a compile error.
152 </p>
153</div>
154<div class="section">
155<div class="titlepage"><div><div><h4 class="title">
156<a name="boost_functiontypes.reference.decomposition.components"></a><a class="link" href="decomposition.html#boost_functiontypes.reference.decomposition.components" title="components">components</a>
157</h4></div></div></div>
158<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>
159<span class="keyword">struct</span> <span class="identifier">components</span><span class="special">;</span>
160</pre>
161<p>
162 <span class="bold"><strong>Header</strong></span>
163 </p>
164<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>
165</pre>
166<div class="variablelist">
167<p class="title"><b></b></p>
168<dl>
169<dt><span class="term"><code class="literal">T</code></span></dt>
170<dd><p>
171 Type to analyze
172 </p></dd>
173<dt><span class="term"><code class="literal">ClassTransform</code></span></dt>
174<dd><p>
175 <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/lambda-expression.html" target="_top">Lambda
176 Expression</a> to transform the class type if <code class="literal">T</code>
177 is a member function pointer
178 </p></dd>
179<dt><span class="term"><code class="literal">components&lt;T,ClassTransform&gt;</code></span></dt>
180<dd><p>
181 <a href="../../../../../mpl/index.html" target="_top">MPL</a> - <a href="../../../../../mpl/doc/refmanual/front-extensible-sequence.html" target="_top">Front</a>
182 / <a href="../../../../../mpl/doc/refmanual/back-extensible-sequence.html" target="_top">Back
183 </a><a href="../../../../../mpl/doc/refmanual/extensible-sequence.html" target="_top">Extensible
184 </a><a href="../../../../../mpl/doc/refmanual/random-access-sequence.html" target="_top">Random
185 Access Sequence</a> of all component types and property tag
186 </p></dd>
187<dt><span class="term"><code class="literal">components&lt;T,ClassTransform&gt;::types</code></span></dt>
188<dd><p>
189 Decorated MPL Sequence, exposed for optimization
190 </p></dd>
191</dl>
192</div>
193<p>
194 Extracts all properties of a callable builtin type, that is the result
195 type, followed by the parameter types (including the type of <code class="literal">this</code>
196 for member function pointers).
197 </p>
198<p>
199 If <code class="literal">T</code> is no callable builtin type, the component types
200 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>.
201 </p>
202</div>
203</div>
204<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
205<td align="left"></td>
206<td align="right"><div class="copyright-footer">Copyright &#169; 2004-2007 Tobias
207 Schwinger<p>
208 Distributed under the Boost Software License, Version 1.0. (See accompanying
209 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>)
210 </p>
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