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copied!<p>I think we need some cleanup.</p> <ol> <li><p>the friend declaration seems ill-placed, from the comment you want CGconstructor_base to be able to access CardGenerator attributes: if this is so, then the friend declaration goes into CardGenerator (I say who I consider as my friends, you do not declare yourself as being someone I consider a friend).</p></li> <li><p>Why do you need friend anyway ? It would be much better if as in the tutorial you used a structure and then stuffed the attributes into CGconstructor_base. This way you will be able to access them from CardGenerator naturally without this supplementary line. When you can do without the 'friend' keyword you should (usual caveat: if doing so does not increase the cost too much).</p></li> <li><p>you want <strong>PRIVATE</strong> inheritance here, this is a detail implementation. Only use public inheritance (or protected even) when OTHER classes/methods will need to know use you 'as-a' base.</p></li> </ol> <p>In a nutshell:</p> <pre><code>struct CGconstructor_base { template<class ArgumentPack> CGconstructor_base(ArgumentPack const& args);/*tutorial says to put code in this function */ cg_type1 cg_attr1; cg_type2 cg_attr2; }; // don't forget this class CardGenerator:private CGconstructor_base {}; </code></pre> <p>I do wonder why 'inheritance' has been chosen by boost instead of (I think) cleaner composition. It is so much easier to abuse inheritance (and require Multiple-Inheritance)... I suppose it is worth a subject of its own though.</p>

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