multiset::key_type
A type that provides a function object that can compare sort keys to determine the relative order of two elements in the multiset.
typedef Key key_type;
Remarks
key_type is a synonym for the template parameter Key.
For more information on Key, see the Remarks section of the multiset Class topic.
Example
See the example for value_type for an example of how to declare and use key_type.
Requirements
Header: <set>
Namespace: std