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One of the most important forms of coupling involves the process of object creation.
Creation is also somewhat more difficult to do abstractly, since...
...there's no such thing as a virtual constructor.
Explanation: A constructor cannot be virtual, because
at the time when the constructor is invoked the virtual table would
not be available in the memory.
Hence we cannot have a virtual constructor.
There are two creation design patterns to consider:
A , which deals with the best way to create objects, and
A , to restrict instantiation of a class to one object.
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