「More C++ Idioms/仮想コンストラクタ(Virtual Constructor)」の版間の差分
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=== Motivation ===
Uses of calling member functions in a class hierarchy polymorphically are well known in the object-oriented programming community. It is a way of implementing the "is-a" (or more practically
C++ natively supports polymorphic destruction of objects using a virtual destructor. An equivalent support for cration and coping of objects is missing. In C++, creation of object(s) always requires its type to be known at compile-time. The Virtual Constructor idiom allows polymorphic creation of and coping of objects in C++.
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