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POC++11 Check COM smart pointer for members
 

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    <p>I have a bunch of collection-like COM interfaces that I'm trying to write an STL-like iterator for. I've got the iterator working and specialized <code>begin()</code> and <code>end()</code> to return my iterator. Everything works perfectly! Except, when I try to use <code>begin(std::vector)</code>, it's using my very general specialization of <code>begin()</code>. Since these COM objects don't extend from a base collection object, I first tried:</p> <pre><code>template&lt; class CollType &gt; CollectionIterator&lt;CollType&gt; begin( CollType coll ) </code></pre> <p>I see why the overload resolution isn't picking the right <code>begin()</code> for <code>std::vector</code>, but I'm not sure how to fix this.</p> <p>Unfortunately, I don't have a base collection class to specialize the <code>coll</code> parameter against. I'm assuming I need something like SFINAE to only resolve these specializations if the right members exist. I tried:</p> <pre><code>template&lt; class CollType, typename std::enable_if&lt; std::is_member_pointer&lt; decltype(&amp;CollType::GetItem) &gt;::value &gt;::type &gt; CollectionIterator&lt;CollType&gt; begin( CollType coll ) </code></pre> <p><em>(where <code>GetItem</code> is a method of <code>CollType</code>)</em></p> <p>As well as a handful of variations, to no avail. To make matters worse, these collections are COM smart pointers, so I'm not sure if <code>GetItem</code> will actually register as a member of the smart pointer.</p> <p>Any insights into the right direction would be great, I've been mostly running in circles with this.</p>
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