23 Containers library [containers]

23.4 Associative containers [associative]

23.4.4 Class template map [map]

23.4.4.5 map specialized algorithms [map.special]

template <class Key, class T, class Compare, class Allocator> void swap(map<Key,T,Compare,Allocator>& x, map<Key,T,Compare,Allocator>& y);

Effects:

x.swap(y);