24 Containers library [containers]

24.5 Unordered associative containers [unord]

24.5.1 In 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 templates iter-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.