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POChecking a member exists, possibly in a base class, VS2005/08 version
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  1. POChecking a member exists, possibly in a base class, VS2005/08 version
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    copied!<p>In <a href="https://stackoverflow.com/questions/9530928/checking-a-member-exists-possibly-in-a-base-class-c11-version">Checking a member exists, possibly in a base class, C++11 version</a>, we developed a C++11 version of the classical member-checking type-trait from <a href="https://stackoverflow.com/questions/1966362/sfinae-to-check-for-inherited-member-functions">SFINAE to check for inherited member functions</a> that also works with C++11 <code>final</code> classes, but uses C++11 features (namely, <code>decltype</code>), too:</p> <pre><code>template&lt;typename T&gt; class has_resize_method { struct Yes { char unused[1]; }; struct No { char unused[2]; }; static_assert(sizeof(Yes) != sizeof(No)); template&lt;class C&gt; static decltype(std::declval&lt;C&gt;().resize(10), Yes()) test(int); template&lt;class C&gt; static No test(...); public: static const bool value = (sizeof(test&lt;T&gt;(0)) == sizeof(Yes)); }; </code></pre> <p>MSVC has had <code>final</code> as a non-standard extension named <a href="http://msdn.microsoft.com/en-us/library/0w2w91tf%28v=vs.80%29.aspx" rel="nofollow noreferrer"><code>sealed</code></a> since VS2005, but <code>decltype</code> has only been added in VS2010. That leaves VS2005 and 2008 where a class that is marked as <code>sealed</code> still breaks the classical type-trait and the C++11 version cannot be used.</p> <p>So, is there a way to formulate <code>has_resize_method</code> such that it works on VC2005/08 <code>sealed</code> classes, too?</p> <p>Obviously, just as using C++11-only features to work around a C++11-only problem (<code>final</code>) is fine, so would be using VS-only extensions to work around the VS2005/08-only problem of <code>sealed</code> classes, but if there's a solution that works for all three sets of compilers {C++11,{VS2005,VS2008},all others}, that would be cool, but probably too much to ask for :)</p>
 

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