Exchange the values of the specified a and b multisets.
Declared in <bslstl_multiset.h>
template<
class KEY,
class COMPARATOR,
class ALLOCATOR>
void
swap(
multiset<KEY, COMPARATOR, ALLOCATOR>& a,
multiset<KEY, COMPARATOR, ALLOCATOR>& b) noexcept(noexcept(a.swap(b)));