set::key_compare
A type that provides a function object that can compare two sort keys to determine the relative order of two elements in the set.
typedef Traits key_compare;
Remarks
key_compare is a synonym for the template parameter Traits.
For more information on Traits see the set Class topic.
Note that both key_compare and value_compare are synonyms for the template parameter Traits. Both types are provided for the set and multiset classes, where they are identical, for compatibility with the map and multimap classes, where they are distinct.
Example
See the example for key_comp for an example of how to declare and use key_compare.
Requirements
Header: <set>
Namespace: std