In which header file c++ STL hash function object is declared?

Ask Time：2009-12-03T01:54:39 Author：raj_arni

If I want to use the hash function object provided in STL, which header file I should include on Linux? e.g. hash Hf;

Author:raj_arni，eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/1834666/in-which-header-file-c-stl-hash-function-object-is-declared

Andreas Brinck :

#include <hash_map>\n\n\non some Linux distros it's available here:\n\n#include <ext/hash_map>\n\n\nMore info here. The hash_map is currently not part of the official STL but it's in TR1 as <unordered_map>.",

2009-12-02T17:58:27

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