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Message: [QUOTE="Hicham Mouline, post: 3406760"] my mistake. The const was my mistaken attempt to change the elements of the pair, ie. to make the 2nd line of code M[5.0] = std::pair<a1, b1>; M[5.0].first = a2; impossible My point is to store the pairs in the map once, and then never change them at a later stage. The choice between std::map<double, std::pair<A, B> > and std::map<double, const std::pair<A, B>* >: With a million entries in the map, and if the pairs already exist elsewhere, the non-ptr-version of the map would copy those pairs, while the ptr version would store only a ptr to each pair. Here i assume sizeof( const std::pair<A, B>* ) < sizeof( std::pair<A, B> ) [/QUOTE]