1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>unfused</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_function_object.html" title="fused_function_object"> 10<link rel="next" href="unfused_typed.html" title="unfused_typed"> 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_function_object.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_typed.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.unfused"></a><a class="link" href="unfused.html" title="unfused">unfused</a> 28</h4></div></div></div> 29<h6> 30<a name="fusion.functional.adapters.unfused.h0"></a> 31 <span class="phrase"><a name="fusion.functional.adapters.unfused.description"></a></span><a class="link" href="unfused.html#fusion.functional.adapters.unfused.description">Description</a> 32 </h6> 33<p> 34 An n-ary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function 35 Object</a> adapter template for an unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic 36 Function Object</a> target function. When called, its arguments are 37 bundled to a <a class="link" href="../../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random 38 Access Sequence</a> of references that is passed to the target function 39 object. 40 </p> 41<p> 42 The nullary overload of the call operator can be removed by setting the 43 second template parameter to <code class="computeroutput"><span class="keyword">false</span></code>, 44 which is very useful if the result type computation would result in a compile 45 error, otherwise (nullary call operator's prototypes can't be templates 46 and thus are instantiated as early as the class template). 47 </p> 48<p> 49 Only LValue arguments are accepted. To overcome this limitation, apply 50 <a href="http://www.boost.org/libs/functional/forward" target="_top">Boost.Functional/Forward 51 Library</a>. 52 </p> 53<p> 54 The type of the target function is allowed to be const qualified or a reference. 55 Const qualification is preserved and propagated appropriately. In other 56 words, only const versions of <code class="literal">operator()</code> can be used 57 if the target function object is const - or, in case the target function 58 object is held by value, the adapter is const. 59 </p> 60<h6> 61<a name="fusion.functional.adapters.unfused.h1"></a> 62 <span class="phrase"><a name="fusion.functional.adapters.unfused.header"></a></span><a class="link" href="unfused.html#fusion.functional.adapters.unfused.header">Header</a> 63 </h6> 64<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">unfused</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 65</pre> 66<h6> 67<a name="fusion.functional.adapters.unfused.h2"></a> 68 <span class="phrase"><a name="fusion.functional.adapters.unfused.synopsis"></a></span><a class="link" href="unfused.html#fusion.functional.adapters.unfused.synopsis">Synopsis</a> 69 </h6> 70<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> <span class="keyword">bool</span> <span class="identifier">AllowNullary</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">></span> 71<span class="keyword">class</span> <span class="identifier">unfused</span><span class="special">;</span> 72</pre> 73<h6> 74<a name="fusion.functional.adapters.unfused.h3"></a> 75 <span class="phrase"><a name="fusion.functional.adapters.unfused.template_parameters"></a></span><a class="link" href="unfused.html#fusion.functional.adapters.unfused.template_parameters">Template 76 parameters</a> 77 </h6> 78<div class="informaltable"><table class="table"> 79<colgroup> 80<col> 81<col> 82<col> 83</colgroup> 84<thead><tr> 85<th> 86 <p> 87 Parameter 88 </p> 89 </th> 90<th> 91 <p> 92 Description 93 </p> 94 </th> 95<th> 96 <p> 97 Default 98 </p> 99 </th> 100</tr></thead> 101<tbody> 102<tr> 103<td> 104 <p> 105 <code class="computeroutput"><span class="identifier">Function</span></code> 106 </p> 107 </td> 108<td> 109 <p> 110 A unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic 111 Function Object</a> 112 </p> 113 </td> 114<td> 115 </td> 116</tr> 117<tr> 118<td> 119 <p> 120 <code class="computeroutput"><span class="identifier">AllowNullary</span></code> 121 </p> 122 </td> 123<td> 124 <p> 125 Boolean constant 126 </p> 127 </td> 128<td> 129 <p> 130 true 131 </p> 132 </td> 133</tr> 134</tbody> 135</table></div> 136<h6> 137<a name="fusion.functional.adapters.unfused.h4"></a> 138 <span class="phrase"><a name="fusion.functional.adapters.unfused.model_of"></a></span><a class="link" href="unfused.html#fusion.functional.adapters.unfused.model_of">Model 139 of</a> 140 </h6> 141<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 142<li class="listitem"> 143 <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function 144 Object</a> 145 </li> 146<li class="listitem"> 147 <a class="link" href="../concepts/def_callable.html" title="Deferred Callable Object">Deferred Callable 148 Object</a> 149 </li> 150</ul></div> 151<div class="variablelist"> 152<p class="title"><b>Notation</b></p> 153<dl class="variablelist"> 154<dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt> 155<dd><p> 156 A possibly const qualified, unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic 157 Function Object</a> type or reference type thereof 158 </p></dd> 159<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt> 160<dd><p> 161 An object convertible to <code class="computeroutput"><span class="identifier">F</span></code> 162 </p></dd> 163<dt><span class="term"><code class="computeroutput"><span class="identifier">UL</span></code></span></dt> 164<dd><p> 165 The type <code class="computeroutput"><span class="identifier">unfused</span><span class="special"><</span><span class="identifier">F</span><span class="special">></span></code> 166 </p></dd> 167<dt><span class="term"><code class="computeroutput"><span class="identifier">ul</span></code></span></dt> 168<dd><p> 169 An instance of <code class="computeroutput"><span class="identifier">UL</span></code>, 170 initialized with <code class="computeroutput"><span class="identifier">f</span></code> 171 </p></dd> 172<dt><span class="term"><code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code></span></dt> 173<dd><p> 174 Arguments to <code class="computeroutput"><span class="identifier">ul</span></code> 175 </p></dd> 176</dl> 177</div> 178<h6> 179<a name="fusion.functional.adapters.unfused.h5"></a> 180 <span class="phrase"><a name="fusion.functional.adapters.unfused.expression_semantics"></a></span><a class="link" href="unfused.html#fusion.functional.adapters.unfused.expression_semantics">Expression 181 Semantics</a> 182 </h6> 183<div class="informaltable"><table class="table"> 184<colgroup> 185<col> 186<col> 187</colgroup> 188<thead><tr> 189<th> 190 <p> 191 Expression 192 </p> 193 </th> 194<th> 195 <p> 196 Semantics 197 </p> 198 </th> 199</tr></thead> 200<tbody> 201<tr> 202<td> 203 <p> 204 <code class="computeroutput"><span class="identifier">UL</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code> 205 </p> 206 </td> 207<td> 208 <p> 209 Creates a fused function as described above, initializes the 210 target function with <code class="computeroutput"><span class="identifier">f</span></code>. 211 </p> 212 </td> 213</tr> 214<tr> 215<td> 216 <p> 217 <code class="computeroutput"><span class="identifier">UL</span><span class="special">()</span></code> 218 </p> 219 </td> 220<td> 221 <p> 222 Creates a fused function as described above, attempts to use 223 <code class="computeroutput"><span class="identifier">F</span></code>'s default constructor. 224 </p> 225 </td> 226</tr> 227<tr> 228<td> 229 <p> 230 <code class="computeroutput"><span class="identifier">ul</span><span class="special">(</span><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span><span class="special">)</span></code> 231 </p> 232 </td> 233<td> 234 <p> 235 Calls <code class="computeroutput"><span class="identifier">f</span></code> with 236 a <a class="link" href="../../sequence.html" title="Sequence">Sequence</a> that contains 237 references to the arguments <code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code>. 238 </p> 239 </td> 240</tr> 241</tbody> 242</table></div> 243<h6> 244<a name="fusion.functional.adapters.unfused.h6"></a> 245 <span class="phrase"><a name="fusion.functional.adapters.unfused.example"></a></span><a class="link" href="unfused.html#fusion.functional.adapters.unfused.example">Example</a> 246 </h6> 247<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">fused_incrementer</span> 248<span class="special">{</span> 249 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Seq</span><span class="special">></span> 250 <span class="keyword">struct</span> <span class="identifier">result</span> 251 <span class="special">{</span> 252 <span class="keyword">typedef</span> <span class="keyword">void</span> <span class="identifier">type</span><span class="special">;</span> 253 <span class="special">};</span> 254 255 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Seq</span><span class="special">></span> 256 <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Seq</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">s</span><span class="special">)</span> <span class="keyword">const</span> 257 <span class="special">{</span> 258 <a class="link" href="../../algorithm/iteration/functions/for_each.html" title="for_each"><code class="computeroutput"><span class="identifier">for_each</span></code></a><span class="special">(</span><span class="identifier">s</span><span class="special">,++</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">lambda</span><span class="special">::</span><span class="identifier">_1</span><span class="special">);</span> 259 <span class="special">}</span> 260<span class="special">};</span> 261 262<span class="keyword">void</span> <span class="identifier">try_it</span><span class="special">()</span> 263<span class="special">{</span> 264 <span class="identifier">unfused</span><span class="special"><</span><span class="identifier">fused_incrementer</span><span class="special">></span> <span class="identifier">increment</span><span class="special">;</span> 265 <span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">2</span><span class="special">;</span> <span class="keyword">char</span> <span class="identifier">b</span> <span class="special">=</span> <span class="char">'X'</span><span class="special">;</span> 266 <span class="identifier">increment</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">);</span> 267 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">a</span> <span class="special">==</span> <span class="number">3</span> <span class="special">&&</span> <span class="identifier">b</span> <span class="special">==</span> <span class="char">'Y'</span><span class="special">);</span> 268<span class="special">}</span> 269</pre> 270<h6> 271<a name="fusion.functional.adapters.unfused.h7"></a> 272 <span class="phrase"><a name="fusion.functional.adapters.unfused.see_also"></a></span><a class="link" href="unfused.html#fusion.functional.adapters.unfused.see_also">See 273 also</a> 274 </h6> 275<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 276<li class="listitem"> 277 <a class="link" href="unfused_typed.html" title="unfused_typed"><code class="computeroutput"><span class="identifier">unfused_typed</span></code></a> 278 </li> 279<li class="listitem"> 280 <a class="link" href="../generation/functions/mk_unfused.html" title="make_unfused"><code class="computeroutput"><span class="identifier">make_unfused</span></code></a> 281 </li> 282</ul></div> 283</div> 284<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 285<td align="left"></td> 286<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 287 Dan Marsden, Tobias Schwinger<p> 288 Distributed under the Boost Software License, Version 1.0. (See accompanying 289 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>) 290 </p> 291</div></td> 292</tr></table> 293<hr> 294<div class="spirit-nav"> 295<a accesskey="p" href="fused_function_object.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_typed.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 296</div> 297</body> 298</html> 299
