Return the key-comparison functor (or function pointer) used by this multimap; if a comparator was supplied at construction, return its value, otherwise return a default constructed key_compare object. Note that this comparator compares objects of type KEY, which is the key part of the value_type objects contained in this multimap.
Declared in <bslstl_multimap.h>
multimap<KEY, VALUE, COMPARATOR, ALLOCATOR>::key_compare
key_comp() const;