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c++ Programming Glossary: user_tMaintaining a unique set of elements on different criteria C++ STL http://stackoverflow.com/questions/4450095/maintaining-a-unique-set-of-elements-on-different-criteria-c-stl container. Assume that you have the following type struct user_t string id name email int age friend ostream operator ostream.. age friend ostream operator ostream output_stream const user_t user return output_stream user.id user.name user.age user.email.. user.email n friend istream operator istream input_stream user_t user return input_stream user.id user.name user.age user.email..
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