History
The first widely used implementation of hash tables in the C++ language was hash_map, hash_set, hash_multimap, hash_multiset class templates of the SGI STL. Due to its usefulness it was later included in several other implementations of the C++ standard library, e.g. in the GCC's libstdc++ or in MSVC standard library.
The hash_* class templates were proposed into C++ TR1 and were accepted under names unordered_*. Later, they were incorporated into the C++11 revision of the C++ standard. An implementation is also available in the Boost C++ Libraries as
Read more about this topic: Unordered Associative Containers (C++)
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