std::__is_fast_hash< _Hash >(3)                       Library Functions Manual

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