1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Macro BOOST_TTI_HAS_FUNCTION_TEMPLATE</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. The Type Traits Introspection Library"> 8<link rel="up" href="header/boost/tti/has_function_template_hpp.html" title="Header <boost/tti/has_function_template.hpp>"> 9<link rel="prev" href="BOOST_TT_idm45731741201584.html" title="Macro BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE"> 10<link rel="next" href="header/boost/tti/has_member_data_hpp.html" title="Header <boost/tti/has_member_data.hpp>"> 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="BOOST_TT_idm45731741201584.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="header/boost/tti/has_function_template_hpp.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="header/boost/tti/has_member_data_hpp.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="refentry"> 26<a name="BOOST_TT_idm45731741193568"></a><div class="titlepage"></div> 27<div class="refnamediv"> 28<h2><span class="refentrytitle">Macro BOOST_TTI_HAS_FUNCTION_TEMPLATE</span></h2> 29<p>BOOST_TTI_HAS_FUNCTION_TEMPLATE — A macro which expands to a metafunction which tests whether an inner member function template or static member function template with a particular name exists. </p> 30</div> 31<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 32<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="header/boost/tti/has_function_template_hpp.html" title="Header <boost/tti/has_function_template.hpp>">boost/tti/has_function_template.hpp</a>> 33 34</span>BOOST_TTI_HAS_FUNCTION_TEMPLATE(name, ...)</pre></div> 35<div class="refsect1"> 36<a name="idm45658025065632"></a><h2>Description</h2> 37<p>BOOST_TTI__HAS_FUNCTION_TEMPLATE is a macro which expands to a metafunction. The metafunction tests whether an inner member function template or static member function template with a particular name exists. The macro takes the form of BOOST_TTI_HAS_FUNCTION_TEMPLATE(name,...) where</p> 38<p>name = inner member function template or static member function template name <br> 39 ... = variadic parameters.</p> 40<p>The variadic parameter(s) are either:</p> 41<p>A sequence of valid instantiations for the static member function template parameters ie. 'int,long,double' etc.</p> 42<p>or</p> 43<p>A single variadic parameter which is a Boost PP array whose elements are a sequence of valid instantiations for the static member function template parameters ie. '(3,(int,long,double))' etc. This form is allowed in order to be compatible with using the non-variadic form of this macro.</p> 44<p>BOOST_TTI_HAS_FUNCTION_TEMPLATE generates a metafunction called "has_function_template_'name'" where 'name' is the first macro parameter.</p> 45<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_TP_T</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_R</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_FS</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_TAG</span><span class="special">></span> 46<span class="keyword">struct</span> <span class="identifier">has_function_template_</span><span class="char">'name'</span> 47 <span class="special">{</span> 48 <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">value</span> <span class="special">=</span> <span class="identifier">unspecified</span><span class="special">;</span> 49 <span class="keyword">typedef</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">bool_</span><span class="special"><</span><span class="keyword">true</span><span class="special">-</span><span class="identifier">or</span><span class="special">-</span><span class="keyword">false</span><span class="special">></span> <span class="identifier">type</span><span class="special">;</span> 50 <span class="special">}</span><span class="special">;</span> 51 52<span class="identifier">The</span> <span class="identifier">metafunction</span> <span class="identifier">types</span> <span class="identifier">and</span> <span class="keyword">return</span><span class="special">:</span> 53 54 <span class="identifier">BOOST_TTI_TP_T</span> <span class="special">=</span> <span class="identifier">the</span> <span class="identifier">enclosing</span> <span class="identifier">type</span> <span class="identifier">in</span> <span class="identifier">which</span> <span class="identifier">to</span> <span class="identifier">look</span> <span class="keyword">for</span> <span class="identifier">our</span> <span class="char">'name'</span><span class="special">.</span> 55 <span class="identifier">The</span> <span class="identifier">enclosing</span> <span class="identifier">type</span> <span class="identifier">can</span> <span class="identifier">be</span> <span class="identifier">a</span> <span class="keyword">class</span><span class="special">,</span> <span class="keyword">struct</span><span class="special">,</span> <span class="identifier">or</span> <span class="keyword">union</span><span class="special">.</span> 56 57 <span class="identifier">BOOST_TTI_TP_R</span> <span class="special">=</span> <span class="identifier">the</span> <span class="keyword">return</span> <span class="identifier">type</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span> 58 <span class="identifier">in</span> <span class="identifier">a</span> <span class="identifier">single</span> <span class="identifier">instantiation</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span> 59 60 <span class="identifier">BOOST_TTI_TP_FS</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">optional</span><span class="special">)</span> <span class="identifier">the</span> <span class="identifier">parameters</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span> <span class="identifier">as</span> <span class="identifier">a</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span> <span class="identifier">forward</span> <span class="identifier">sequence</span> 61 <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span> <span class="identifier">parameters</span> <span class="identifier">are</span> <span class="identifier">not</span> <span class="identifier">empty</span><span class="special">.</span> <span class="identifier">These</span> <span class="identifier">parameters</span> <span class="identifier">are</span> <span class="identifier">a</span> <span class="identifier">single</span> 62 <span class="identifier">instantiation</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span><span class="special">.</span> 63 64 <span class="identifier">BOOST_TTI_TP_TAG</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">optional</span><span class="special">)</span> <span class="identifier">a</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_types</span> <span class="identifier">tag</span> <span class="identifier">to</span> <span class="identifier">apply</span> <span class="identifier">to</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="keyword">template</span> 65 <span class="keyword">if</span> <span class="identifier">a</span> <span class="identifier">tag</span> <span class="identifier">is</span> <span class="identifier">needed</span><span class="special">.</span> 66 67 <span class="identifier">returns</span> <span class="special">=</span> <span class="char">'value'</span> <span class="identifier">is</span> <span class="keyword">true</span> <span class="keyword">if</span> <span class="identifier">the</span> <span class="char">'name'</span> <span class="identifier">exists</span><span class="special">,</span> 68 <span class="identifier">with</span> <span class="identifier">the</span> <span class="identifier">appropriate</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="keyword">template</span> <span class="identifier">or</span> <span class="keyword">static</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="keyword">template</span> <span class="identifier">type</span><span class="special">,</span> 69 <span class="identifier">otherwise</span> <span class="char">'value'</span> <span class="identifier">is</span> <span class="keyword">false</span><span class="special">.</span> 70</pre> 71<p> </p> 72</div> 73</div> 74<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 75<td align="left"></td> 76<td align="right"><div class="copyright-footer">Copyright © 2011-2013 Tropic Software 77 East Inc<p> 78 Distributed under the Boost Software License, Version 1.0. (See accompanying 79 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>) 80 </p> 81</div></td> 82</tr></table> 83<hr> 84<div class="spirit-nav"> 85<a accesskey="p" href="BOOST_TT_idm45731741201584.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="header/boost/tti/has_function_template_hpp.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="header/boost/tti/has_member_data_hpp.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 86</div> 87</body> 88</html> 89
