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*s.begin(), but same argument can be used for vector, which has front/back
Here I'm talking about design reasons why front/back would be bad design, so please skip obvious reasons like committee forgot about it...
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Per the C++ standard, iteration over the elements in an std::set proceeds in sorted order as determined by std::less or by the optional comparison predicate template argument.
std::set is an associative container that contains a sorted set of unique objects of type Key . Sorting is done using the key comparison function Compare. Search, removal, and insertion operations have logarithmic complexity.
No, it does not.
I imagine that the words "front" and "back" are reserved for sequence containers (i.e. those where the order of elements is determined by the order of insertion), and the words are meant to suggest a physical position in that sequence.
Since set is not a sequence container (but instead an associative container), this isn't appropriate. In particular, note that the meaning of "front" can change by later insertions of an unrelated element.
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