24.7 Standard Function Objects, Predicates, and Binders

Several function objects defined in <functional>
Extend utility of algorithms w/out writing new code
less<T> described last chptr.
Predicate version of operator<
Provided for all relational operators: equal_to, not_equal_to, greater, less, greater_equal, less_equal
E.g., create a set in decreasing order:
set<int, greater<int> > new_set;