1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>fused_function_object</title> 5<link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../index.html" title="Chapter 1. Fusion 2.2"> 8<link rel="up" href="../adapters.html" title="Adapters"> 9<link rel="prev" href="fused_procedure.html" title="fused_procedure"> 10<link rel="next" href="unfused.html" title="unfused"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="fused_procedure.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../adapters.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="unfused.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="fusion.functional.adapters.fused_function_object"></a><a class="link" href="fused_function_object.html" title="fused_function_object">fused_function_object</a> 28</h4></div></div></div> 29<h6> 30<a name="fusion.functional.adapters.fused_function_object.h0"></a> 31 <span class="phrase"><a name="fusion.functional.adapters.fused_function_object.description"></a></span><a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.description">Description</a> 32 </h6> 33<p> 34 An unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function 35 Object</a> adapter template for a <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic 36 Function Object</a> target function. It takes a <a class="link" href="../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward 37 Sequence</a> that contains the arguments for the target function. 38 </p> 39<p> 40 The type of the target function is allowed to be const qualified or a reference. 41 Const qualification is preserved and propagated appropriately (in other 42 words, only const versions of <code class="literal">operator()</code> can be used 43 for an target function object that is const or, if the target function 44 object is held by value, the adapter is const). 45 </p> 46<h6> 47<a name="fusion.functional.adapters.fused_function_object.h1"></a> 48 <span class="phrase"><a name="fusion.functional.adapters.fused_function_object.header"></a></span><a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.header">Header</a> 49 </h6> 50<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">adapter</span><span class="special">/</span><span class="identifier">fused_function_object</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 51</pre> 52<h6> 53<a name="fusion.functional.adapters.fused_function_object.h2"></a> 54 <span class="phrase"><a name="fusion.functional.adapters.fused_function_object.synopsis"></a></span><a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.synopsis">Synopsis</a> 55 </h6> 56<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Function</span><span class="special">></span> 57<span class="keyword">class</span> <span class="identifier">fused_function_object</span><span class="special">;</span> 58</pre> 59<h6> 60<a name="fusion.functional.adapters.fused_function_object.h3"></a> 61 <span class="phrase"><a name="fusion.functional.adapters.fused_function_object.template_parameters"></a></span><a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.template_parameters">Template 62 parameters</a> 63 </h6> 64<div class="informaltable"><table class="table"> 65<colgroup> 66<col> 67<col> 68<col> 69</colgroup> 70<thead><tr> 71<th> 72 <p> 73 Parameter 74 </p> 75 </th> 76<th> 77 <p> 78 Description 79 </p> 80 </th> 81<th> 82 <p> 83 Default 84 </p> 85 </th> 86</tr></thead> 87<tbody><tr> 88<td> 89 <p> 90 <code class="computeroutput"><span class="identifier">Function</span></code> 91 </p> 92 </td> 93<td> 94 <p> 95 <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function 96 Object</a> type 97 </p> 98 </td> 99<td> 100 </td> 101</tr></tbody> 102</table></div> 103<h6> 104<a name="fusion.functional.adapters.fused_function_object.h4"></a> 105 <span class="phrase"><a name="fusion.functional.adapters.fused_function_object.model_of"></a></span><a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.model_of">Model 106 of</a> 107 </h6> 108<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 109<li class="listitem"> 110 <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function 111 Object</a> 112 </li> 113<li class="listitem"> 114 <a class="link" href="../concepts/def_callable.html" title="Deferred Callable Object">Deferred Callable 115 Object</a> 116 </li> 117</ul></div> 118<div class="variablelist"> 119<p class="title"><b>Notation</b></p> 120<dl class="variablelist"> 121<dt><span class="term"><code class="computeroutput"><span class="identifier">R</span></code></span></dt> 122<dd><p> 123 A possibly const qualified <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic 124 Function Object</a> type or reference type thereof 125 </p></dd> 126<dt><span class="term"><code class="computeroutput"><span class="identifier">r</span></code></span></dt> 127<dd><p> 128 An object convertible to <code class="computeroutput"><span class="identifier">R</span></code> 129 </p></dd> 130<dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code></span></dt> 131<dd><p> 132 A <a class="link" href="../../sequence.html" title="Sequence">Sequence</a> of arguments that 133 are accepted by <code class="computeroutput"><span class="identifier">r</span></code> 134 </p></dd> 135<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt> 136<dd><p> 137 An instance of <code class="computeroutput"><span class="identifier">fused</span><span class="special"><</span><span class="identifier">R</span><span class="special">></span></code> 138 </p></dd> 139</dl> 140</div> 141<h6> 142<a name="fusion.functional.adapters.fused_function_object.h5"></a> 143 <span class="phrase"><a name="fusion.functional.adapters.fused_function_object.expression_semantics"></a></span><a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.expression_semantics">Expression 144 Semantics</a> 145 </h6> 146<div class="informaltable"><table class="table"> 147<colgroup> 148<col> 149<col> 150</colgroup> 151<thead><tr> 152<th> 153 <p> 154 Expression 155 </p> 156 </th> 157<th> 158 <p> 159 Semantics 160 </p> 161 </th> 162</tr></thead> 163<tbody> 164<tr> 165<td> 166 <p> 167 <code class="computeroutput"><span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">R</span><span class="special">>(</span><span class="identifier">r</span><span class="special">)</span></code> 168 </p> 169 </td> 170<td> 171 <p> 172 Creates a fused function as described above, initializes the 173 target function with <code class="computeroutput"><span class="identifier">r</span></code>. 174 </p> 175 </td> 176</tr> 177<tr> 178<td> 179 <p> 180 <code class="computeroutput"><span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">R</span><span class="special">>()</span></code> 181 </p> 182 </td> 183<td> 184 <p> 185 Creates a fused function as described above, attempts to use 186 <code class="computeroutput"><span class="identifier">R</span></code>'s default constructor. 187 </p> 188 </td> 189</tr> 190<tr> 191<td> 192 <p> 193 <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code> 194 </p> 195 </td> 196<td> 197 <p> 198 Calls <code class="computeroutput"><span class="identifier">r</span></code> with 199 the elements in <code class="computeroutput"><span class="identifier">s</span></code> 200 as its arguments. 201 </p> 202 </td> 203</tr> 204</tbody> 205</table></div> 206<h6> 207<a name="fusion.functional.adapters.fused_function_object.h6"></a> 208 <span class="phrase"><a name="fusion.functional.adapters.fused_function_object.example"></a></span><a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.example">Example</a> 209 </h6> 210<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">SeqOfSeqs</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Func</span><span class="special">></span> 211<span class="keyword">typename</span> <a class="link" href="../../algorithm/transformation/metafunctions/transform.html" title="transform"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">transform</span></code></a><span class="special"><</span> <span class="identifier">zip_view</span><span class="special"><</span><span class="identifier">SeqOfSeqs</span><span class="special">></span> <span class="keyword">const</span><span class="special">,</span> 212 <span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&></span> <span class="special">>::</span><span class="identifier">type</span> 213<span class="identifier">n_ary_transform</span><span class="special">(</span><span class="identifier">SeqOfSeqs</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">f</span><span class="special">)</span> 214<span class="special">{</span> 215 <span class="keyword">return</span> <a class="link" href="../../algorithm/transformation/functions/transform.html" title="transform"><code class="computeroutput"><span class="identifier">transform</span></code></a><span class="special">(</span><span class="identifier">zip_view</span><span class="special"><</span><span class="identifier">SeqOfSeqs</span><span class="special">>(</span><span class="identifier">s</span><span class="special">),</span> 216 <span class="identifier">fused_function_object</span><span class="special"><</span><span class="identifier">Func</span> <span class="keyword">const</span> <span class="special">&>(</span><span class="identifier">f</span><span class="special">));</span> 217<span class="special">}</span> 218 219<span class="keyword">struct</span> <span class="identifier">sub</span> 220<span class="special">{</span> 221 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sig</span><span class="special">></span> 222 <span class="keyword">struct</span> <span class="identifier">result</span><span class="special">;</span> 223 224 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Self</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 225 <span class="keyword">struct</span> <span class="identifier">result</span><span class="special"><</span> <span class="identifier">Self</span><span class="special">(</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">T</span><span class="special">)</span> <span class="special">></span> 226 <span class="special">{</span> <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span> 227 228 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 229 <span class="identifier">T</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="identifier">T</span> <span class="identifier">rhs</span><span class="special">)</span> <span class="keyword">const</span> 230 <span class="special">{</span> 231 <span class="keyword">return</span> <span class="identifier">lhs</span> <span class="special">-</span> <span class="identifier">rhs</span><span class="special">;</span> 232 <span class="special">}</span> 233<span class="special">};</span> 234 235<span class="keyword">void</span> <span class="identifier">try_it</span><span class="special">()</span> 236<span class="special">{</span> 237 <a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">></span> <span class="identifier">a</span><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">2.0f</span><span class="special">);</span> 238 <a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">></span> <span class="identifier">b</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">1.5f</span><span class="special">);</span> 239 <a class="link" href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span><span class="keyword">float</span><span class="special">></span> <span class="identifier">c</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">0.5f</span><span class="special">);</span> 240 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">c</span> <span class="special">==</span> <span class="identifier">n_ary_transform</span><span class="special">(</span><a class="link" href="../../container/generation/functions/vector_tie.html" title="vector_tie"><code class="computeroutput"><span class="identifier">vector_tie</span></code></a><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">),</span> <span class="identifier">sub</span><span class="special">()));</span> 241<span class="special">}</span> 242</pre> 243<h6> 244<a name="fusion.functional.adapters.fused_function_object.h7"></a> 245 <span class="phrase"><a name="fusion.functional.adapters.fused_function_object.see_also"></a></span><a class="link" href="fused_function_object.html#fusion.functional.adapters.fused_function_object.see_also">See 246 also</a> 247 </h6> 248<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 249<li class="listitem"> 250 <a class="link" href="fused.html" title="fused"><code class="computeroutput"><span class="identifier">fused</span></code></a> 251 </li> 252<li class="listitem"> 253 <a class="link" href="fused_procedure.html" title="fused_procedure"><code class="computeroutput"><span class="identifier">fused_procedure</span></code></a> 254 </li> 255<li class="listitem"> 256 <a class="link" href="../invocation/functions/invoke_fobj.html" title="invoke_function_object"><code class="computeroutput"><span class="identifier">invoke_function_object</span></code></a> 257 </li> 258<li class="listitem"> 259 <a class="link" href="../generation/functions/mk_fused_fobj.html" title="make_fused_function_object"><code class="computeroutput"><span class="identifier">make_fused_function_object</span></code></a> 260 </li> 261<li class="listitem"> 262 <a class="link" href="../../support/deduce.html" title="deduce"><code class="computeroutput"><span class="identifier">deduce</span></code></a> 263 </li> 264</ul></div> 265</div> 266<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 267<td align="left"></td> 268<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 269 Dan Marsden, Tobias Schwinger<p> 270 Distributed under the Boost Software License, Version 1.0. (See accompanying 271 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>) 272 </p> 273</div></td> 274</tr></table> 275<hr> 276<div class="spirit-nav"> 277<a accesskey="p" href="fused_procedure.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../adapters.html"><img src="../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="unfused.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 278</div> 279</body> 280</html> 281
