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Alex Rivera
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It is a commonly held belief that the the C++ standard library is not generally intended to be extended using inheritance. Certainly, I (and others) have criticised people who suggest deriving from classes such as std::vector . However, this question: Can what() return NULL for exceptions? made me realise that there is at least one part of the Standard Library that is intended to be so extended - std::exception . So, my question has two parts: Are there any other standard library classes which are intended to be derived from? If one does derive from a standard library class such as std::exception , is one bound by the interface described in the ISO Standard? For example, would a program which used an exception class who's what() member function did not return a NTBS (say it returned a null pointer) be standard conforming?
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