1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Macro BOOST_TTI_TRAIT_HAS_MEMBER_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. 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The metafunction tests whether an inner member function template with a particular name exists. The macro takes the form of BOOST_TTI_TRAIT_HAS_MEMBER_FUNCTION_TEMPLATE(trait,name,...) where</p> 38<p>trait = the name of the metafunction <br> 39 name = inner member function template name <br> 40 ... = variadic parameters.</p> 41<p>The variadic parameter(s) are either:</p> 42<p>A sequence of valid instantiations for the member function template parameters ie. 'int,long,double' etc.</p> 43<p>or</p> 44<p>A single variadic parameter which is a Boost PP array whose elements are a sequence of valid instantiations for the 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> 45<p>BOOST_TTI_TRAIT_HAS_MEMBER_FUNCTION_TEMPLATE generates a metafunction called "trait" where 'trait' is the first macro parameter.</p> 46<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> 47<span class="keyword">struct</span> <span class="identifier">trait</span> 48 <span class="special">{</span> 49 <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> 50 <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> 51 <span class="special">}</span><span class="special">;</span> 52 53<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> 54 55 <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> 56 <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> 57 <span class="identifier">OR</span> 58 <span class="identifier">a</span> <span class="identifier">pointer</span> <span class="identifier">to</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="identifier">as</span> <span class="identifier">a</span> <span class="identifier">single</span> <span class="identifier">type</span> 59 <span class="identifier">which</span> <span class="identifier">encapsulates</span> <span class="identifier">a</span> <span class="identifier">single</span> <span class="identifier">instantiation</span> <span class="identifier">of</span> 60 <span class="identifier">the</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="keyword">template</span><span class="special">.</span> 61 62 <span class="identifier">BOOST_TTI_TP_R</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="keyword">return</span> <span class="identifier">type</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="keyword">template</span> 63 <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">member</span> <span class="identifier">function</span> <span class="keyword">template</span> 64 <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">first</span> <span class="identifier">parameter</span> <span class="identifier">is</span> <span class="identifier">the</span> <span class="identifier">enclosing</span> <span class="identifier">type</span><span class="special">.</span> 65 66 <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">member</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> 67 <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">first</span> <span class="identifier">parameter</span> <span class="identifier">is</span> <span class="identifier">the</span> <span class="identifier">enclosing</span> <span class="identifier">type</span> <span class="identifier">and</span> <span class="identifier">the</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="keyword">template</span> <span class="identifier">parameters</span> 68 <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> <span class="identifier">instantiation</span> <span class="identifier">of</span> <span class="identifier">the</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="keyword">template</span><span class="special">.</span> 69 70 <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">member</span> <span class="identifier">function</span> <span class="keyword">template</span> 71 <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">first</span> <span class="identifier">parameter</span> <span class="identifier">is</span> <span class="identifier">the</span> <span class="identifier">enclosing</span> <span class="identifier">type</span> <span class="identifier">and</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> 72 73 <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> 74 <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">type</span><span class="special">,</span> 75 <span class="identifier">otherwise</span> <span class="char">'value'</span> <span class="identifier">is</span> <span class="keyword">false</span><span class="special">.</span> 76</pre> 77<p> </p> 78</div> 79</div> 80<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 81<td align="left"></td> 82<td align="right"><div class="copyright-footer">Copyright © 2011-2013 Tropic Software 83 East Inc<p> 84 Distributed under the Boost Software License, Version 1.0. (See accompanying 85 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>) 86 </p> 87</div></td> 88</tr></table> 89<hr> 90<div class="spirit-nav"> 91<a accesskey="p" href="header/boost/tti/has_member_function_template_hpp.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="header/boost/tti/has_member_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="BOOST_TT_idm45731741155232.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 92</div> 93</body> 94</html> 95
