NAME

       std::__is_fast_hash< _Hash >

SYNOPSIS

       #include <functional>

       Inherits std::integral_constant< _Tp, __v >.

   Public Types
       typedef integral_constant< _Tp, __v > type
       typedef _Tp value_type

   Public Member Functions
       constexpr operator value_type () const noexcept
       constexpr value_type operator() () const noexcept

   Static Public Attributes
       static constexpr _Tp value

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.

       Definition at line 295 of file functional.

Member Typedef Documentation

   template<typename _Tp , _Tp __v> typedef integral_constant<_Tp, __v> std::integral_constant<
       _Tp, __v >::type [inherited]
       Definition at line 66 of file type_traits.

   template<typename _Tp , _Tp __v> typedef _Tp std::integral_constant< _Tp, __v >::value_type
       [inherited]
       Definition at line 65 of file type_traits.

Member Function Documentation

   template<typename _Tp , _Tp __v> constexpr std::integral_constant< _Tp, __v >::operator
       value_type () const [inline],  [constexpr],  [noexcept],  [inherited]
       Definition at line 67 of file type_traits.

   template<typename _Tp , _Tp __v> constexpr value_type std::integral_constant< _Tp, __v
       >::operator() () const [inline],  [constexpr],  [noexcept],  [inherited]
       Definition at line 72 of file type_traits.

Member Data Documentation

   template<typename _Tp , _Tp __v> constexpr _Tp std::integral_constant< _Tp, __v >::value
       [static],  [constexpr],  [inherited]
       Definition at line 64 of file type_traits.

Author

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