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Message: [QUOTE="Hunk, post: 3052482"] You are right... learnt it the hard way... you say there is some way in letter/envelop idiom? For now i have taken the decision to restrict the user to use only +=. I know this is a very restrictive way , but for now i know of no other way to tackle the issue Thats a good question. I would prefer giving a compilation error for this. This is for the simple reason that Hash_string data members are different than Char_string. So would'nt know which to return The difference in Hash_string and Char_string is that the Hash_string class has a hash value computed and stored as a data member. So comparisons are faster as they would be comparing integers rather than characters. The generic base_string is required as for the interface class a generic version is required. [/QUOTE]