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POSTLifying C++ classes
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  1. POSTLifying C++ classes
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    copied!<p>I'm trying to write a class which contains several std::vectors as data members, and provides a subset of vector's interface to access them:</p> <pre><code>class Mesh { public: private: std::vector&lt;Vector3&gt; positions; std::vector&lt;Vector3&gt; normals; // Several other members along the same lines }; </code></pre> <p>The main thing you can do with a mesh is add positions, normals and other stuff to it. In order to allow an STL-like way of accessing a Mesh (add from arrays, other containers, etc.), I'm toying with the idea of adding methods like this:</p> <pre><code>public: template&lt;class InIter&gt; void AddNormals(InIter first, InIter last); </code></pre> <p>Problem is, from what I understand of templates, these methods will have to be defined in the header file (seems to make sense; without a concrete iterator type, the compiler doesn't know how to generate object code for the obvious implementation of this method).</p> <ol> <li><p>Is this actually a problem? My gut reaction is not to go around sticking huge chunks of code in header files, but my C++ is a little rusty with not much STL experience outside toy examples, and I'm not sure what "acceptable" C++ coding practice is on this.</p></li> <li><p>Is there a better way to expose this functionality while retaining an STL-like generic programming flavour? One way would be something like this:</p></li> </ol> <p>(end list)</p> <pre><code>class RestrictedVector&lt;T&gt; { public: RestrictedVector(std::vector&lt;T&gt; wrapped) : wrapped(wrapped) {} template &lt;class InIter&gt; void Add(InIter first, InIter last) { std::copy(first, last, std::back_insert_iterator(wrapped)); } private: std::vector&lt;T&gt; wrapped; }; </code></pre> <p>and then expose instances of these on Mesh instead, but that's starting to reek a little of overengineering :P Any advice is greatly appreciated!</p>
 

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