Defined in header
template< class F, class I1, class I2 >
concept indirect_binary_predicate =
indirect_binary_predicate specifies requirements for algorithms that call binary predicates as their arguments. The key difference between this concept and std::predicate is that it is applied to the types that
I2 references, rather than
 Semantic requirements
indirect_binary_predicate only if all concepts it subsumes are modeled.