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    <blockquote> <p>1 - Is this implementation looks correct? I mean is it really looks like a policy based design?</p> </blockquote> <p>Policy classes derive their usefulness from combining behaviors to produce a rich variety of combinations. When you have a single template parameter like this, it's not much of a policy class.</p> <blockquote> <p>2 - I can now hook any kind of pens to writer. But what will I do when I got a pen with no default constructor (only parameterized constructors)? How will I handle this situation?</p> </blockquote> <p>Again, this is an odd example of a policy class. However, to directly answer your question, you can provide a constructor which accepts PenType. You should probably also avoid inheriting from PenType and store it as a member instead (no need to tightly couple your policy class with its policies).</p> <blockquote> <p>I guess compiler will replace PenType with InkPen. If yes, why I am not able to call just Write() from StartWriting() instead of prefixing base class name (PenType::Write())?</p> </blockquote> <p>When you inherit from a class template, you have to specify this->member or BaseClass::member.</p> <blockquote> <p>4 - I think policy based design forces you to derive from classes which is semantically invalid. In the above code, a writer is derived from a pen only because writer uses a pen. But saying writer is a pen is semantically invalid. Is there any other better way to address this or I am missing something here?</p> </blockquote> <p>Store PenType as a member as suggested above. Always prefer composition to inheritance as it avoids the tight coupling relationship of inheritance.</p>
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    1. POPolicy based design and best practices - C++
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