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[unord.general]
23 Containers library [containers]
23.5 Unordered associative containers [unord]
23.5.1 General [unord.general]
The header <unordered_map> defines the class templates unordered_map and unordered_multimap; the header <unordered_set> defines the class templates unordered_set and unordered_multiset.
The exposition-only alias templatesiter-value-type, iter-key-type,iter-mapped-type, iter-to-alloc-type,range-key-type, range-mapped-type, and range-to-alloc-type defined in [associative.general] may appear in deduction guides for unordered containers.