1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Macro BOOST_TTI_TRAIT_HAS_STATIC_MEMBER_FUNCTION</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 a static member function with a particular name and signature exists. The macro takes the form of BOOST_TTI_TRAIT_HAS_STATIC_MEMBER_FUNCTION(trait,name) where</p> 38<p>trait = the name of the metafunction <br> 39 name = the name of the inner member.</p> 40<p>BOOST_TTI_TRAIT_HAS_STATIC_MEMBER_FUNCTION generates a metafunction called "trait" where 'trait' is the macro parameter.</p> 41<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_TP_R</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_TP_FS</span><span class="special">,</span><span class="keyword">class</span> <span class="identifier">BOOST_TTI_TP_TAG</span><span class="special">></span> 42<span class="keyword">struct</span> <span class="identifier">trait</span> 43 <span class="special">{</span> 44 <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> 45 <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> 46 <span class="special">}</span><span class="special">;</span> 47 48<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> 49 50 <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> 51 <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> 52 53 <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="keyword">static</span> <span class="identifier">member</span> <span class="identifier">function</span> 54 <span class="identifier">OR</span> 55 <span class="identifier">the</span> <span class="identifier">signature</span> <span class="identifier">of</span> <span class="identifier">a</span> <span class="identifier">function</span> <span class="identifier">in</span> <span class="identifier">the</span> <span class="identifier">form</span> <span class="identifier">of</span> <span class="identifier">Return_Type</span> <span class="special">(</span> <span class="identifier">Parameter_Types</span> <span class="special">)</span> 56 57 <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="keyword">static</span> <span class="identifier">member</span> <span class="identifier">function</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> 58 <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">second</span> <span class="identifier">parameter</span> <span class="identifier">is</span> <span class="identifier">a</span> <span class="keyword">return</span> <span class="identifier">type</span> <span class="identifier">and</span> <span class="identifier">the</span> <span class="identifier">function</span> <span class="identifier">parameters</span> <span class="identifier">exist</span><span class="special">.</span> 59 60 <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="keyword">static</span> <span class="identifier">member</span> <span class="identifier">function</span> 61 <span class="keyword">if</span> <span class="identifier">the</span> <span class="identifier">second</span> <span class="identifier">parameter</span> <span class="identifier">is</span> <span class="identifier">a</span> <span class="keyword">return</span> <span class="identifier">type</span> <span class="identifier">and</span> <span class="identifier">the</span> <span class="identifier">need</span> <span class="keyword">for</span> <span class="identifier">a</span> <span class="identifier">tag</span> <span class="identifier">exists</span><span class="special">.</span> 62 63 <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> 64 <span class="identifier">with</span> <span class="identifier">the</span> <span class="identifier">appropriate</span> <span class="keyword">static</span> <span class="identifier">member</span> <span class="identifier">function</span> <span class="identifier">type</span><span class="special">,</span> 65 <span class="identifier">otherwise</span> <span class="char">'value'</span> <span class="identifier">is</span> <span class="keyword">false</span><span class="special">.</span> 66</pre> 67<p> </p> 68</div> 69</div> 70<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 71<td align="left"></td> 72<td align="right"><div class="copyright-footer">Copyright © 2011-2013 Tropic Software 73 East Inc<p> 74 Distributed under the Boost Software License, Version 1.0. (See accompanying 75 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>) 76 </p> 77</div></td> 78</tr></table> 79<hr> 80<div class="spirit-nav"> 81<a accesskey="p" href="header/boost/tti/has_static_member_function_hpp.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="header/boost/tti/has_static_member_function_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_idm45731741130368.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 82</div> 83</body> 84</html> 85
