does STL has hashmap data structure?

I have used unsorted_map from TR1. I never know any data structure from STL is hashmap. My coworker insists that STL has hashmap, which he cannot (or开发者_运维技巧 not willing )find for me. Could anybody judge this argue?

Thanks.

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Standard C++98 does not have a hash map, but many implementation of the STL, like the original SGI implementation, do have a hash_map class.

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The SGI STL (from which GCC's is based) does have a hash_map implementation. This is not standard C++ however.

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In C++0x, there's an unordered_map and unordered_multimap, that'll usually be implemented as hash maps.

If your compiler doesn't have them yet, you can use boost::tr1::unordered_map.