template<typename_Key,typename_Value,typename_Alloc,typename_ExtractKey,typename_Equal,typename_H1,typename_H2,typename_Hash,typename_RehashPolicy,typename_Traits,bool_Unique_keys=_Traits::__unique_keys::value>
struct std::__detail::_Map_base< _Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash,
_RehashPolicy, _Traits, _Unique_keys >" Primary class template _Map_base.
If the hashtable has a value type of the form pair<T1, T2> and a key extraction policy (_ExtractKey) that
returns the first part of the pair, the hashtable gets a mapped_type typedef. If it satisfies those
criteria and also has unique keys, then it also gets an operator[].
Definition at line 633 of file hashtable_policy.h.