NAME

       std::__is_fast_hash< _Hash >

SYNOPSIS

       #include <functional>

       Inherits std::true_type.

Detailed Description

   template<typename _Hash>
       struct std::__is_fast_hash< _Hash >"Hint about performance of hash functions.

       If a given hash function object is not fast, the hash-based containers will cache the hash
       code. The default behavior is to consider that hashers are fast unless specified
       otherwise.

       Users can specialize this for their own hash functions in order to force caching of hash
       codes in unordered containers. Specializing this trait affects the ABI of the unordered
       containers, so use it carefully.

Author

       Generated automatically by Doxygen for libstdc++ from the source code.

                                            libstdc++          std::__is_fast_hash< _Hash >(3cxx)