table of contents
| std::__detail::_Hashtable_traits< _Cache_hash_code, _Constant_iterators, _Unique_keys >(3) | Library Functions Manual | std::__detail::_Hashtable_traits< _Cache_hash_code, _Constant_iterators, _Unique_keys >(3) |
NAME¶
std::__detail::_Hashtable_traits< _Cache_hash_code, _Constant_iterators, _Unique_keys > -
SYNOPSIS¶
Public Types¶
template<bool _Cond> using __bool_constant =
integral_constant< bool, _Cond >
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.
_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 131 of file hashtable_policy.h.
Author¶
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| Tue Sep 29 2020 | libstdc++ |