std::__detail::_Hashtable_traits man page

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


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 212 of file hashtable_policy.h.


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libstdc++ Fri Sep 16 2016