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 Most commonly, 0.A.B-DRX and 0.A.B-DRY are compatible, but 0.A.B and 0.A.C clients are never compatible. 
				__________________namespace retval { template <class T> class ReturnValueGen { private: T x; public: ReturnValueGen() { x = 0; }; T& Generator() { return x; }; }; } int main() { retval::ReturnValueGen<int> retvalue; return retvalue.Generator(); }
 C++ is wonderful.
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