Remove from this multimap all value_type objects whose keys are equivalent to the specified key, if such entries exist, and return the number of erased objects; otherwise, if there is no value_type objects having an equivalent key, return 0 with no other effect. This method invalidates only iterators and references to the removed element and previously saved values of the end() iterator.
Declared in <bslstl_multimap.h>
multimap<KEY, VALUE, COMPARATOR, ALLOCATOR>::size_type
erase(key_type const& key);