I am wondering whether this is true? If it is, is this behavior guaranteed by the c++ standard?
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I am wondering whether this is true? If it is, is this behavior guaranteed by the c++ standard?
The elements in a
std::mapmust have unique keys, so… no.The
std::multimapcontainer allows multiple values mapped to one key. When iterating over astd::multimapthe elements are ordered by key, but the order of elements having the same key is not specified.Note that in the latest draft of the forthcoming C++0x standard (N3092), the relative ordering of elements with the same key is guaranteed (so, at some point, you’ll be able to rely on this behavior).