NAME

       std::__detail::_Hashtable_traits< _Cache_hash_code, _Constant_iterators, _Unique_keys >

SYNOPSIS

   Public Types
       using __constant_iterators = __bool_constant< _Constant_iterators >
       using __hash_cached = __bool_constant< _Cache_hash_code >
       using __unique_keys = __bool_constant< _Unique_keys >

Detailed Description

   template<bool _Cache_hash_code, bool _Constant_iterators, bool _Unique_keys>
       struct std::__detail::_Hashtable_traits< _Cache_hash_code, _Constant_iterators, _Unique_keys >" struct
       _Hashtable_traits

       Important traits for hash tables.

       Template Parameters
           _Cache_hash_code Boolean value. True if the value of the hash function is stored along with the
           value. This is a time-space tradeoff. Storing it may improve lookup speed by reducing the number of
           times we need to call the _Equal function.
           _Constant_iterators Boolean value. True if iterator and const_iterator are both constant iterator
           types. This is true for unordered_set and unordered_multiset, false for unordered_map and
           unordered_multimap.
           _Unique_keys Boolean value. True if the return value of _Hashtable::count(k) is always at most one,
           false if it may be an arbitrary number. This is true for unordered_set and unordered_map, false for
           unordered_multiset and unordered_multimap.

       Definition at line 199 of file hashtable_policy.h.

Author

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libstdc++                                        Mon Oct 2std::__detail::_Hashta...erators, _Unique_keys >(3cxx)