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POCRTP'ed Containers
 

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    <p>I am cutting my teeth at some template programming and I am very new to this. What I want to implement are a few CRTP classes that contain an STL container. Let <code>class A{};</code> serve as an example for the (compile time) base class from which <code>class B{};</code> and <code>class C{};</code> are "derived" at compile time following the CRTP style.</p> <p>Now both <code>B</code> and <code>C</code> will contain containers. For the purpose of the example let it be a <code>std::vector</code> and a <code>std::set</code> respectively. Now, I want to expose the iterators of these via a <code>begin()</code> and an <code>end()</code> function that exposes a forward iterator. However, I do not want to expose what is the exact container that is inside <code>B</code> and <code>C</code> and I want to define these functions for <code>A</code>, so that at call time the correct one for <code>B</code> and <code>C</code> get used.</p> <p>Is this possible ? Right now my plan is to have a <code>Iterator</code> inner class for <code>B</code> as well as <code>C</code> that will contain the actual iterator of (a vector or a set as the case may be) and delegate the call to it. However this seems to be a lot of replicated glue code and I suspect there is a better option.</p> <p>I have a couple of questions: </p> <ol> <li><p>How do I declare the inner clases in <code>A</code>, <code>B</code> and <code>C</code> so that it plays well with CRTP. Do I need to replicate it for <code>A</code>, <code>B</code> and <code>C</code> ? Can it be an empty class in <code>A</code> and I mask them in <code>B</code> and <code>C</code> with specialized implementations ?</p></li> <li><p>How can I expose the iterator with less glue and less duplication ?</p></li> </ol> <p>I do not want to create dependencies with external libraries like boost and want to stick to std only. So I have to implement whatever extra I need myself. Thanks for all the help.</p>
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    1. COI assume you want `begin()` and `end()` to be virtual functions in class A right?
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    2. CO@Seth Carnegie No thats the thing I do not want this classes to have any virtual function at all.
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    3. COyou are running into a problem that I had as well. You want to pass around Bs and Cs as As right?
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