1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Adapting Functions</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. Phoenix 3.2.0"> 8<link rel="up" href="../function.html" title="Function"> 9<link rel="prev" href="../function.html" title="Function"> 10<link rel="next" href="../operator.html" title="Operator"> 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="../function.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../function.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="../operator.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="phoenix.modules.function.adapting_functions"></a><a class="link" href="adapting_functions.html" title="Adapting Functions">Adapting 28 Functions</a> 29</h4></div></div></div> 30<div class="toc"><dl class="toc"> 31<dt><span class="section"><a href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary">BOOST_PHOENIX_ADAPT_FUNCTION_NULLARY</a></span></dt> 32<dt><span class="section"><a href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function">BOOST_PHOENIX_ADAPT_FUNCTION</a></span></dt> 33<dt><span class="section"><a href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary">BOOST_PHOENIX_ADAPT_CALLABLE_NULLARY</a></span></dt> 34<dt><span class="section"><a href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable">BOOST_PHOENIX_ADAPT_CALLABLE</a></span></dt> 35</dl></div> 36<p> 37 If you want to adapt already existing functions or function objects it 38 will become a repetetive task. Therefor the following boilerplate macros 39 are provided to help you adapt already exsiting functions, thus reducing 40 the need to <a class="link" href="../bind.html" title="Bind">phoenix.modules.bind</a> 41 functions. 42 </p> 43<div class="section"> 44<div class="titlepage"><div><div><h5 class="title"> 45<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary"></a><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary" title="BOOST_PHOENIX_ADAPT_FUNCTION_NULLARY">BOOST_PHOENIX_ADAPT_FUNCTION_NULLARY</a> 46</h5></div></div></div> 47<h6> 48<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.h0"></a> 49 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.description"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.description">Description</a> 50 </h6> 51<p> 52 <code class="computeroutput"><span class="identifier">BOOST_PHOENIX_ADAPT_FUNCTION_NULLARY</span></code> 53 is a macro that can be used to generate all the necessary boilerplate 54 to make an arbitrary nullary function a lazy function. 55 </p> 56<div class="note"><table border="0" summary="Note"> 57<tr> 58<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td> 59<th align="left">Note</th> 60</tr> 61<tr><td align="left" valign="top"><p> 62 These macros generate no global objects. The resulting lazy functions 63 are real functions that create the lazy function expression object 64 </p></td></tr> 65</table></div> 66<h6> 67<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.h1"></a> 68 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.synopsis"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.synopsis">Synopsis</a> 69 </h6> 70<pre class="programlisting"><span class="identifier">BOOST_PHOENIX_ADAPT_FUNCTION_NULLARY</span><span class="special">(</span> 71 <span class="identifier">RETURN_TYPE</span> 72 <span class="special">,</span> <span class="identifier">LAZY_FUNCTION</span> 73 <span class="special">,</span> <span class="identifier">FUNCTION</span> 74<span class="special">)</span> 75</pre> 76<h6> 77<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.h2"></a> 78 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.semantics"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.semantics">Semantics</a> 79 </h6> 80<p> 81 The above macro generates all necessary code to have a nullary lazy function 82 <code class="computeroutput"><span class="identifier">LAZY_FUNCTION</span></code> which calls 83 the nullary <code class="computeroutput"><span class="identifier">FUNCTION</span></code> 84 that has the return type <code class="computeroutput"><span class="identifier">RETURN_TYPE</span></code> 85 </p> 86<h6> 87<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.h3"></a> 88 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.header"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.header">Header</a> 89 </h6> 90<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">function</span><span class="special">/</span><span class="identifier">adapt_function</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 91</pre> 92<h6> 93<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.h4"></a> 94 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.example"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function_nullary.example">Example</a> 95 </h6> 96<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">demo</span> 97<span class="special">{</span> 98 <span class="keyword">int</span> <span class="identifier">foo</span><span class="special">()</span> 99 <span class="special">{</span> 100 <span class="keyword">return</span> <span class="number">42</span><span class="special">;</span> 101 <span class="special">}</span> 102<span class="special">}</span> 103 104<span class="identifier">BOOST_PHOENIX_ADAPT_FUNCTION_NULLARY</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">foo</span><span class="special">,</span> <span class="identifier">demo</span><span class="special">::</span><span class="identifier">foo</span><span class="special">)</span> 105 106<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 107<span class="special">{</span> 108 <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">_1</span><span class="special">;</span> 109 110 <span class="identifier">assert</span><span class="special">((</span><span class="identifier">_1</span> <span class="special">+</span> <span class="identifier">foo</span><span class="special">())(</span><span class="number">1</span><span class="special">)</span> <span class="special">==</span> <span class="number">43</span><span class="special">);</span> 111<span class="special">}</span> 112</pre> 113</div> 114<div class="section"> 115<div class="titlepage"><div><div><h5 class="title"> 116<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function"></a><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function" title="BOOST_PHOENIX_ADAPT_FUNCTION">BOOST_PHOENIX_ADAPT_FUNCTION</a> 117</h5></div></div></div> 118<h6> 119<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.h0"></a> 120 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.description"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.description">Description</a> 121 </h6> 122<p> 123 <code class="computeroutput"><span class="identifier">BOOST_PHOENIX_ADAPT_FUNCTION</span></code> 124 is a macro that can be used to generate all the necessary boilerplate 125 to make an arbitrary function a lazy function. 126 </p> 127<h6> 128<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.h1"></a> 129 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.synopsis"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.synopsis">Synopsis</a> 130 </h6> 131<pre class="programlisting"><span class="identifier">BOOST_PHOENIX_ADAPT_FUNCTION</span><span class="special">(</span> 132 <span class="identifier">RETURN_TYPE</span> 133 <span class="special">,</span> <span class="identifier">LAZY_FUNCTION</span> 134 <span class="special">,</span> <span class="identifier">FUNCTION</span> 135 <span class="special">,</span> <span class="identifier">FUNCTION_ARITY</span> 136<span class="special">)</span> 137</pre> 138<h6> 139<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.h2"></a> 140 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.semantics"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.semantics">Semantics</a> 141 </h6> 142<p> 143 The above macro generates all necessary code to have a lazy function 144 <code class="computeroutput"><span class="identifier">LAZY_FUNCTION</span></code> which calls 145 <code class="computeroutput"><span class="identifier">FUNCTION</span></code> that has the 146 return type <code class="computeroutput"><span class="identifier">RETURN_TYPE</span></code> 147 with <code class="computeroutput"><span class="identifier">FUNCTION_ARITY</span></code> number 148 of arguments. 149 </p> 150<h6> 151<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.h3"></a> 152 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.header"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.header">Header</a> 153 </h6> 154<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">function</span><span class="special">/</span><span class="identifier">adapt_function</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 155</pre> 156<h6> 157<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.h4"></a> 158 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.example"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_function.example">Example</a> 159 </h6> 160<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">demo</span> 161<span class="special">{</span> 162 <span class="keyword">int</span> <span class="identifier">plus</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">a</span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">b</span><span class="special">)</span> 163 <span class="special">{</span> 164 <span class="keyword">return</span> <span class="identifier">a</span> <span class="special">+</span> <span class="identifier">b</span><span class="special">;</span> 165 <span class="special">}</span> 166 167 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 168 <span class="identifier">T</span> 169 <span class="identifier">plus</span><span class="special">(</span><span class="identifier">T</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">T</span> <span class="identifier">b</span><span class="special">,</span> <span class="identifier">T</span> <span class="identifier">c</span><span class="special">)</span> 170 <span class="special">{</span> 171 <span class="keyword">return</span> <span class="identifier">a</span> <span class="special">+</span> <span class="identifier">b</span> <span class="special">+</span> <span class="identifier">c</span><span class="special">;</span> 172 <span class="special">}</span> 173<span class="special">}</span> 174 175<span class="identifier">BOOST_PHOENIX_ADAPT_FUNCTION</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">plus</span><span class="special">,</span> <span class="identifier">demo</span><span class="special">::</span><span class="identifier">plus</span><span class="special">,</span> <span class="number">2</span><span class="special">)</span> 176 177<span class="identifier">BOOST_PHOENIX_ADAPT_FUNCTION</span><span class="special">(</span> 178 <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">A0</span><span class="special">>::</span><span class="identifier">type</span> 179 <span class="special">,</span> <span class="identifier">plus</span> 180 <span class="special">,</span> <span class="identifier">demo</span><span class="special">::</span><span class="identifier">plus</span> 181 <span class="special">,</span> <span class="number">3</span> 182<span class="special">)</span> 183 184<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 185<span class="special">{</span> 186 <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">arg_names</span><span class="special">::</span><span class="identifier">arg1</span><span class="special">;</span> 187 <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">arg_names</span><span class="special">::</span><span class="identifier">arg2</span><span class="special">;</span> 188 189 <span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">123</span><span class="special">;</span> 190 <span class="keyword">int</span> <span class="identifier">b</span> <span class="special">=</span> <span class="number">256</span><span class="special">;</span> 191 192 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">plus</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</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="special">==</span> <span class="identifier">a</span><span class="special">+</span><span class="identifier">b</span><span class="special">);</span> 193 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">plus</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">,</span> <span class="number">3</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="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> 194<span class="special">}</span> 195</pre> 196</div> 197<div class="section"> 198<div class="titlepage"><div><div><h5 class="title"> 199<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary"></a><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary" title="BOOST_PHOENIX_ADAPT_CALLABLE_NULLARY">BOOST_PHOENIX_ADAPT_CALLABLE_NULLARY</a> 200</h5></div></div></div> 201<h6> 202<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.h0"></a> 203 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.description"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.description">Description</a> 204 </h6> 205<p> 206 <code class="computeroutput"><span class="identifier">BOOST_PHOENIX_ADAPT_CALLABLE_NULLARY</span></code> 207 is a macro that can be used to generate all the necessary boilerplate 208 to make an arbitrary nullary function object a lazy function. 209 </p> 210<h6> 211<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.h1"></a> 212 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.synopsis"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.synopsis">Synopsis</a> 213 </h6> 214<pre class="programlisting"><span class="identifier">BOOST_PHOENIX_ADAPT_CALLABLE_NULLARY</span><span class="special">(</span> 215 <span class="identifier">LAZY_FUNCTION</span> 216 <span class="special">,</span> <span class="identifier">CALLABLE</span> 217<span class="special">)</span> 218</pre> 219<h6> 220<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.h2"></a> 221 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.semantics"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.semantics">Semantics</a> 222 </h6> 223<p> 224 The above macro generates all necessary code to create <code class="computeroutput"><span class="identifier">LAZY_FUNCTION</span></code> which creates a lazy 225 function object that represents a nullary call to <code class="computeroutput"><span class="identifier">CALLABLE</span></code>. 226 The return type is specified by <code class="computeroutput"><span class="identifier">CALLABLE</span></code> 227 conforming to the <a href="http://www.boost.org/doc/libs/release/libs/utility/utility.htm#result_of" target="_top">Boost.Result 228 Of</a> protocol. 229 </p> 230<h6> 231<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.h3"></a> 232 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.header"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.header">Header</a> 233 </h6> 234<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">function</span><span class="special">/</span><span class="identifier">adapt_callable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 235</pre> 236<h6> 237<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.h4"></a> 238 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.example"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable_nullary.example">Example</a> 239 </h6> 240<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">demo</span> 241<span class="special">{</span> 242 <span class="keyword">struct</span> <span class="identifier">foo</span> 243 <span class="special">{</span> 244 <span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">result_type</span><span class="special">;</span> 245 246 <span class="identifier">result_type</span> <span class="keyword">operator</span><span class="special">()()</span> <span class="keyword">const</span> 247 <span class="special">{</span> 248 <span class="keyword">return</span> <span class="number">42</span><span class="special">;</span> 249 <span class="special">}</span> 250 <span class="special">}</span> 251<span class="special">}</span> 252 253<span class="identifier">BOOST_PHOENIX_ADAPT_CALLABLE_NULLARY</span><span class="special">(</span><span class="identifier">foo</span><span class="special">,</span> <span class="identifier">demo</span><span class="special">::</span><span class="identifier">foo</span><span class="special">)</span> 254 255<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 256<span class="special">{</span> 257 <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">_1</span><span class="special">;</span> 258 259 <span class="identifier">assert</span><span class="special">((</span><span class="identifier">_1</span> <span class="special">+</span> <span class="identifier">foo</span><span class="special">())(</span><span class="number">1</span><span class="special">)</span> <span class="special">==</span> <span class="number">43</span><span class="special">);</span> 260<span class="special">}</span> 261</pre> 262</div> 263<div class="section"> 264<div class="titlepage"><div><div><h5 class="title"> 265<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable"></a><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable" title="BOOST_PHOENIX_ADAPT_CALLABLE">BOOST_PHOENIX_ADAPT_CALLABLE</a> 266</h5></div></div></div> 267<h6> 268<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.h0"></a> 269 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.description"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.description">Description</a> 270 </h6> 271<p> 272 <code class="computeroutput"><span class="identifier">BOOST_PHOENIX_ADAPT_CALLABLE</span></code> 273 is a macro that can be used to generate all the necessary boilerplate 274 to make an arbitrary function object a lazy function. 275 </p> 276<h6> 277<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.h1"></a> 278 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.synopsis"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.synopsis">Synopsis</a> 279 </h6> 280<pre class="programlisting"><span class="identifier">BOOST_PHOENIX_ADAPT_CALLABLE</span><span class="special">(</span> 281 <span class="identifier">LAZY_FUNCTION</span> 282 <span class="special">,</span> <span class="identifier">FUNCTION_NAME</span> 283 <span class="special">,</span> <span class="identifier">FUNCTION_ARITY</span> 284<span class="special">)</span> 285</pre> 286<h6> 287<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.h2"></a> 288 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.semantics"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.semantics">Semantics</a> 289 </h6> 290<p> 291 The above macro generates all necessary code to create <code class="computeroutput"><span class="identifier">LAZY_FUNCTION</span></code> which creates a lazy 292 function object that represents a call to <code class="computeroutput"><span class="identifier">CALLABLE</span></code> 293 with <code class="computeroutput"><span class="identifier">FUNCTION_ARITY</span></code> arguments. 294 The return type is specified by <code class="computeroutput"><span class="identifier">CALLABLE</span></code> 295 conforming to the <a href="http://www.boost.org/doc/libs/release/libs/utility/utility.htm#result_of" target="_top">Boost.Result 296 Of</a> protocol. 297 </p> 298<h6> 299<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.h3"></a> 300 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.header"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.header">Header</a> 301 </h6> 302<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">phoenix</span><span class="special">/</span><span class="identifier">function</span><span class="special">/</span><span class="identifier">adapt_callable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 303</pre> 304<h6> 305<a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.h4"></a> 306 <span class="phrase"><a name="phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.example"></a></span><a class="link" href="adapting_functions.html#phoenix.modules.function.adapting_functions.boost_phoenix_adapt_callable.example">Example</a> 307 </h6> 308<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">demo</span> 309<span class="special">{</span> 310 <span class="keyword">struct</span> <span class="identifier">plus</span> 311 <span class="special">{</span> 312 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Sig</span><span class="special">></span> 313 <span class="keyword">struct</span> <span class="identifier">result</span><span class="special">;</span> 314 315 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">This</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A1</span><span class="special">></span> 316 <span class="keyword">struct</span> <span class="identifier">result</span><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">A0</span><span class="special">,</span> <span class="identifier">A1</span><span class="special">)></span> 317 <span class="special">:</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">A0</span><span class="special">></span> 318 <span class="special">{};</span> 319 320 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">This</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A2</span><span class="special">></span> 321 <span class="keyword">struct</span> <span class="identifier">result</span><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">A0</span><span class="special">,</span> <span class="identifier">A1</span><span class="special">,</span> <span class="identifier">A2</span><span class="special">)></span> 322 <span class="special">:</span> <span class="identifier">remove_reference</span><span class="special"><</span><span class="identifier">A0</span><span class="special">></span> 323 <span class="special">{};</span> 324 325 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">A0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A1</span><span class="special">></span> 326 <span class="identifier">A0</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">A0</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a0</span><span class="special">,</span> <span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a1</span><span class="special">)</span> <span class="keyword">const</span> 327 <span class="special">{</span> 328 <span class="keyword">return</span> <span class="identifier">a0</span> <span class="special">+</span> <span class="identifier">a1</span><span class="special">;</span> 329 <span class="special">}</span> 330 331 <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">A0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">A2</span><span class="special">></span> 332 <span class="identifier">A0</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">A0</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a0</span><span class="special">,</span> <span class="identifier">A1</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a1</span><span class="special">,</span> <span class="identifier">A2</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">a2</span><span class="special">)</span> <span class="keyword">const</span> 333 <span class="special">{</span> 334 <span class="keyword">return</span> <span class="identifier">a0</span> <span class="special">+</span> <span class="identifier">a1</span> <span class="special">+</span> <span class="identifier">a2</span><span class="special">;</span> 335 <span class="special">}</span> 336 <span class="special">};</span> 337<span class="special">}</span> 338 339<span class="identifier">BOOST_PHOENIX_ADAPT_CALLABLE</span><span class="special">(</span><span class="identifier">plus</span><span class="special">,</span> <span class="identifier">demo</span><span class="special">::</span><span class="identifier">plus</span><span class="special">,</span> <span class="number">2</span><span class="special">)</span> 340 341<span class="identifier">BOOST_PHOENIX_ADAPT_CALLABLE</span><span class="special">(</span><span class="identifier">plus</span><span class="special">,</span> <span class="identifier">demo</span><span class="special">::</span><span class="identifier">plus</span><span class="special">,</span> <span class="number">3</span><span class="special">)</span> 342 343<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 344<span class="special">{</span> 345 <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">arg_names</span><span class="special">::</span><span class="identifier">arg1</span><span class="special">;</span> 346 <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">arg_names</span><span class="special">::</span><span class="identifier">arg2</span><span class="special">;</span> 347 348 <span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">123</span><span class="special">;</span> 349 <span class="keyword">int</span> <span class="identifier">b</span> <span class="special">=</span> <span class="number">256</span><span class="special">;</span> 350 351 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">plus</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</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="special">==</span> <span class="identifier">a</span><span class="special">+</span><span class="identifier">b</span><span class="special">);</span> 352 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">plus</span><span class="special">(</span><span class="identifier">arg1</span><span class="special">,</span> <span class="identifier">arg2</span><span class="special">,</span> <span class="number">3</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="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> 353<span class="special">}</span> 354</pre> 355</div> 356</div> 357<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 358<td align="left"></td> 359<td align="right"><div class="copyright-footer">Copyright © 2002-2005, 2010, 2014, 2015 Joel de Guzman, Dan Marsden, Thomas 360 Heller, John Fletcher<p> 361 Distributed under the Boost Software License, Version 1.0. (See accompanying 362 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>) 363 </p> 364</div></td> 365</tr></table> 366<hr> 367<div class="spirit-nav"> 368<a accesskey="p" href="../function.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../function.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="../operator.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> 369</div> 370</body> 371</html> 372
