23 Containers library [containers]

23.4 Associative containers [associative]

23.4.5 Class template multimap [multimap]

23.4.5.5 multimap specialized algorithms [multimap.special]

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

Effects:

x.swap(y);