C++ set key_comp

The key_comp function in C++ set is utilized to provide a duplicate of the comparison object that the set container employs for key comparisons.

The comparison object is utilized to evaluate key values between two elements within a container. This comparison object is specified during object initialization and can be a function pointer or a function object. In both scenarios, it accepts two arguments of identical type and outputs true if the first argument precedes the second argument based on the more specific weak order; otherwise, it returns false.

Note: By default, comparison object is a less object, which returns the same as operator __PRESERVE_10__ 4.