1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>unfused_typed</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="unfused.html" title="unfused"> 10<link rel="next" href="limits.html" title="Limits"> 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="unfused.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="limits.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_typed"></a><a class="link" href="unfused_typed.html" title="unfused_typed">unfused_typed</a> 28</h4></div></div></div> 29<h6> 30<a name="fusion.functional.adapters.unfused_typed.h0"></a> 31 <span class="phrase"><a name="fusion.functional.adapters.unfused_typed.description"></a></span><a class="link" href="unfused_typed.html#fusion.functional.adapters.unfused_typed.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> that is passed to the target function object. 39 </p> 40<p> 41 The call operators of resulting function objects are strictly typed (in 42 other words, non-templatized) with the types from a <a class="link" href="../../sequence.html" title="Sequence">Sequence</a>. 43 </p> 44<p> 45 The type of the target function is allowed to be const qualified or a reference. 46 Const qualification is preserved and propagated appropriately (in other 47 words, only const versions of <code class="literal">operator()</code> can be used 48 if the target function object is const - or, in case the target function 49 object is held by value, the adapter is const). 50 </p> 51<div class="note"><table border="0" summary="Note"> 52<tr> 53<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td> 54<th align="left">Note</th> 55</tr> 56<tr><td align="left" valign="top"><p> 57 For Microsoft Visual C++ 7.1 (Visual Studio 2003) the detection of the 58 Function Object's const qualification easily causes an internal error. 59 Therefore the adapter is always treated as if it was const. 60 </p></td></tr> 61</table></div> 62<div class="tip"><table border="0" summary="Tip"> 63<tr> 64<td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../../../doc/src/images/tip.png"></td> 65<th align="left">Tip</th> 66</tr> 67<tr><td align="left" valign="top"><p> 68 If the type sequence passed to this template contains non-reference elements, 69 the element is copied only once - the call operator's signature is optimized 70 automatically to avoid by-value parameters. 71 </p></td></tr> 72</table></div> 73<h6> 74<a name="fusion.functional.adapters.unfused_typed.h1"></a> 75 <span class="phrase"><a name="fusion.functional.adapters.unfused_typed.header"></a></span><a class="link" href="unfused_typed.html#fusion.functional.adapters.unfused_typed.header">Header</a> 76 </h6> 77<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_typed</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 78</pre> 79<h6> 80<a name="fusion.functional.adapters.unfused_typed.h2"></a> 81 <span class="phrase"><a name="fusion.functional.adapters.unfused_typed.synopsis"></a></span><a class="link" href="unfused_typed.html#fusion.functional.adapters.unfused_typed.synopsis">Synopsis</a> 82 </h6> 83<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">class</span> <span class="identifier">Sequence</span><span class="special">></span> 84<span class="keyword">class</span> <span class="identifier">unfused_typed</span><span class="special">;</span> 85</pre> 86<h6> 87<a name="fusion.functional.adapters.unfused_typed.h3"></a> 88 <span class="phrase"><a name="fusion.functional.adapters.unfused_typed.template_parameters"></a></span><a class="link" href="unfused_typed.html#fusion.functional.adapters.unfused_typed.template_parameters">Template 89 parameters</a> 90 </h6> 91<div class="informaltable"><table class="table"> 92<colgroup> 93<col> 94<col> 95<col> 96</colgroup> 97<thead><tr> 98<th> 99 <p> 100 Parameter 101 </p> 102 </th> 103<th> 104 <p> 105 Description 106 </p> 107 </th> 108<th> 109 <p> 110 Default 111 </p> 112 </th> 113</tr></thead> 114<tbody> 115<tr> 116<td> 117 <p> 118 <code class="computeroutput"><span class="identifier">Function</span></code> 119 </p> 120 </td> 121<td> 122 <p> 123 A unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic 124 Function Object</a> 125 </p> 126 </td> 127<td> 128 </td> 129</tr> 130<tr> 131<td> 132 <p> 133 <code class="computeroutput"><span class="identifier">Sequence</span></code> 134 </p> 135 </td> 136<td> 137 <p> 138 A <a class="link" href="../../sequence.html" title="Sequence">Sequence</a> 139 </p> 140 </td> 141<td> 142 </td> 143</tr> 144</tbody> 145</table></div> 146<h6> 147<a name="fusion.functional.adapters.unfused_typed.h4"></a> 148 <span class="phrase"><a name="fusion.functional.adapters.unfused_typed.model_of"></a></span><a class="link" href="unfused_typed.html#fusion.functional.adapters.unfused_typed.model_of">Model 149 of</a> 150 </h6> 151<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 152<li class="listitem"> 153 <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function 154 Object</a> 155 </li> 156<li class="listitem"> 157 <a class="link" href="../concepts/def_callable.html" title="Deferred Callable Object">Deferred Callable 158 Object</a> 159 </li> 160</ul></div> 161<div class="variablelist"> 162<p class="title"><b>Notation</b></p> 163<dl class="variablelist"> 164<dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt> 165<dd><p> 166 A possibly const qualified, unary <a class="link" href="../concepts/poly.html" title="Polymorphic Function Object">Polymorphic 167 Function Object</a> type or reference type thereof 168 </p></dd> 169<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt> 170<dd><p> 171 An object convertible to <code class="computeroutput"><span class="identifier">F</span></code> 172 </p></dd> 173<dt><span class="term"><code class="computeroutput"><span class="identifier">S</span></code></span></dt> 174<dd><p> 175 A <a class="link" href="../../sequence.html" title="Sequence">Sequence</a> of parameter types 176 </p></dd> 177<dt><span class="term"><code class="computeroutput"><span class="identifier">UT</span></code></span></dt> 178<dd><p> 179 The type <code class="computeroutput"><span class="identifier">unfused_typed</span><span class="special"><</span><span class="identifier">F</span><span class="special">,</span><span class="identifier">S</span><span class="special">></span></code> 180 </p></dd> 181<dt><span class="term"><code class="computeroutput"><span class="identifier">ut</span></code></span></dt> 182<dd><p> 183 An instance of <code class="computeroutput"><span class="identifier">UT</span></code>, 184 initialized with <code class="computeroutput"><span class="identifier">f</span></code> 185 </p></dd> 186<dt><span class="term"><code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code></span></dt> 187<dd><p> 188 Arguments to <code class="computeroutput"><span class="identifier">ut</span></code>, 189 convertible to the types in <code class="computeroutput"><span class="identifier">S</span></code> 190 </p></dd> 191</dl> 192</div> 193<h6> 194<a name="fusion.functional.adapters.unfused_typed.h5"></a> 195 <span class="phrase"><a name="fusion.functional.adapters.unfused_typed.expression_semantics"></a></span><a class="link" href="unfused_typed.html#fusion.functional.adapters.unfused_typed.expression_semantics">Expression 196 Semantics</a> 197 </h6> 198<div class="informaltable"><table class="table"> 199<colgroup> 200<col> 201<col> 202</colgroup> 203<thead><tr> 204<th> 205 <p> 206 Expression 207 </p> 208 </th> 209<th> 210 <p> 211 Semantics 212 </p> 213 </th> 214</tr></thead> 215<tbody> 216<tr> 217<td> 218 <p> 219 <code class="computeroutput"><span class="identifier">UT</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code> 220 </p> 221 </td> 222<td> 223 <p> 224 Creates a fused function as described above, initializes the 225 target function with <code class="computeroutput"><span class="identifier">f</span></code>. 226 </p> 227 </td> 228</tr> 229<tr> 230<td> 231 <p> 232 <code class="computeroutput"><span class="identifier">UT</span><span class="special">()</span></code> 233 </p> 234 </td> 235<td> 236 <p> 237 Creates a fused function as described above, attempts to use 238 <code class="computeroutput"><span class="identifier">F</span></code>'s default constructor. 239 </p> 240 </td> 241</tr> 242<tr> 243<td> 244 <p> 245 <code class="computeroutput"><span class="identifier">ut</span><span class="special">(</span><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span><span class="special">)</span></code> 246 </p> 247 </td> 248<td> 249 <p> 250 Calls <code class="computeroutput"><span class="identifier">f</span></code> with 251 an instance of <code class="computeroutput"><span class="identifier">S</span></code> 252 (or a subsequence of <code class="computeroutput"><span class="identifier">S</span></code> 253 starting at the first element, if fewer arguments are given and 254 the overload hasn't been disabled) initialized with <code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code>. 255 </p> 256 </td> 257</tr> 258</tbody> 259</table></div> 260<h6> 261<a name="fusion.functional.adapters.unfused_typed.h6"></a> 262 <span class="phrase"><a name="fusion.functional.adapters.unfused_typed.example"></a></span><a class="link" href="unfused_typed.html#fusion.functional.adapters.unfused_typed.example">Example</a> 263 </h6> 264<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">add_assign</span> <span class="comment">// applies operator+=</span> 265<span class="special">{</span> 266 <span class="keyword">typedef</span> <span class="keyword">void</span> <span class="identifier">result_type</span><span class="special">;</span> <span class="comment">// for simplicity</span> 267 268 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 269 <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="special">&</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">rhs</span><span class="special">)</span> <span class="keyword">const</span> 270 <span class="special">{</span> 271 <span class="identifier">lhs</span> <span class="special">+=</span> <span class="identifier">rhs</span><span class="special">;</span> 272 <span class="special">}</span> 273<span class="special">};</span> 274 275<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Tie</span><span class="special">></span> 276<span class="keyword">class</span> <span class="identifier">fused_parallel_adder</span> 277<span class="special">{</span> 278 <span class="identifier">Tie</span> <span class="identifier">tie_dest</span><span class="special">;</span> 279<span class="keyword">public</span><span class="special">:</span> 280 <span class="keyword">explicit</span> <span class="identifier">fused_parallel_adder</span><span class="special">(</span><span class="identifier">Tie</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">dest</span><span class="special">)</span> 281 <span class="special">:</span> <span class="identifier">tie_dest</span><span class="special">(</span><span class="identifier">dest</span><span class="special">)</span> 282 <span class="special">{</span> <span class="special">}</span> 283 284 <span class="keyword">typedef</span> <span class="keyword">void</span> <span class="identifier">result_type</span><span class="special">;</span> 285 286 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Seq</span><span class="special">></span> 287 <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> 288 <span class="special">{</span> 289 <span class="identifier">for_each</span><span class="special">(</span> <span class="identifier">zip</span><span class="special">(</span><span class="identifier">tie_dest</span><span class="special">,</span><span class="identifier">s</span><span class="special">),</span> <span class="identifier">fused</span><span class="special"><</span><span class="identifier">add_assign</span><span class="special">>()</span> <span class="special">);</span> 290 <span class="special">}</span> 291<span class="special">};</span> 292 293<span class="comment">// accepts a tie and creates a typed function object from it</span> 294<span class="keyword">struct</span> <span class="identifier">fused_parallel_adder_maker</span> 295<span class="special">{</span> 296 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sig</span><span class="special">></span> 297 <span class="keyword">struct</span> <span class="identifier">result</span><span class="special">;</span> 298 299 <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">class</span> <span class="identifier">Seq</span><span class="special">></span> 300 <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">Seq</span><span class="special">)</span> <span class="special">></span> 301 <span class="special">{</span> 302 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">Seq</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">seq</span><span class="special">;</span> 303 304 <span class="keyword">typedef</span> <span class="identifier">unfused_typed</span><span class="special"><</span> <span class="identifier">fused_parallel_adder</span><span class="special"><</span><span class="identifier">seq</span><span class="special">>,</span> 305 <span class="keyword">typename</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">transform</span><span class="special"><</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">_</span><span class="special">></span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">></span> <span class="identifier">type</span><span class="special">;</span> 306 <span class="special">};</span> 307 308 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">Seq</span><span class="special">></span> 309 <span class="keyword">typename</span> <span class="identifier">result</span><span class="special"><</span> <span class="keyword">void</span><span class="special">(</span><span class="identifier">Seq</span><span class="special">)</span> <span class="special">>::</span><span class="identifier">type</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">tie</span><span class="special">)</span> 310 <span class="special">{</span> 311 <span class="keyword">return</span> <span class="keyword">typename</span> <span class="identifier">result</span><span class="special"><</span> <span class="keyword">void</span><span class="special">(</span><span class="identifier">Seq</span><span class="special">)</span> <span class="special">>::</span><span class="identifier">type</span><span class="special">(</span> 312 <span class="identifier">fused_parallel_adder</span><span class="special"><</span><span class="identifier">Seq</span><span class="special">>(</span><span class="identifier">tie</span><span class="special">)</span> <span class="special">);</span> 313 <span class="special">}</span> 314<span class="special">};</span> 315<span class="identifier">unfused</span><span class="special"><</span><span class="identifier">fused_parallel_adder_maker</span><span class="special">></span> <span class="identifier">parallel_add</span><span class="special">;</span> 316 317<span class="keyword">void</span> <span class="identifier">try_it</span><span class="special">()</span> 318<span class="special">{</span> 319 <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> 320 <span class="comment">// the second call is strictly typed with the types deduced from the</span> 321 <span class="comment">// first call</span> 322 <span class="identifier">parallel_add</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">)(</span><span class="number">3</span><span class="special">,</span><span class="number">2</span><span class="special">);</span> 323 <span class="identifier">parallel_add</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">)(</span><span class="number">3</span><span class="special">);</span> 324 <span class="identifier">parallel_add</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">)();</span> 325 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">a</span> <span class="special">==</span> <span class="number">8</span> <span class="special">&&</span> <span class="identifier">b</span> <span class="special">==</span> <span class="char">'Z'</span><span class="special">);</span> 326<span class="special">}</span> 327</pre> 328<h6> 329<a name="fusion.functional.adapters.unfused_typed.h7"></a> 330 <span class="phrase"><a name="fusion.functional.adapters.unfused_typed.see_also"></a></span><a class="link" href="unfused_typed.html#fusion.functional.adapters.unfused_typed.see_also">See 331 also</a> 332 </h6> 333<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 334<li class="listitem"> 335 <a class="link" href="unfused.html" title="unfused"><code class="computeroutput"><span class="identifier">unfused</span></code></a> 336 </li> 337<li class="listitem"> 338 <a class="link" href="../../support/deduce.html" title="deduce"><code class="computeroutput"><span class="identifier">deduce</span></code></a> 339 </li> 340<li class="listitem"> 341 <a class="link" href="../../support/deduce_sequence.html" title="deduce_sequence"><code class="computeroutput"><span class="identifier">deduce_sequence</span></code></a> 342 </li> 343</ul></div> 344</div> 345<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 346<td align="left"></td> 347<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 348 Dan Marsden, Tobias Schwinger<p> 349 Distributed under the Boost Software License, Version 1.0. (See accompanying 350 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>) 351 </p> 352</div></td> 353</tr></table> 354<hr> 355<div class="spirit-nav"> 356<a accesskey="p" href="unfused.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="limits.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 357</div> 358</body> 359</html> 360
