9 Iterators library [iterators]

9.5 Common algorithm requirements [commonalgoreq]

9.5.5 Concept IndirectlyComparable [commonalgoreq.indirectlycomparable]

1

The IndirectlyComparable concept specifies the common requirements of algorithms that compare values from two different sequences.

  template <class I1, class I2, class R = equal_to<>, class P1 = identity,
    class P2 = identity>
  concept bool IndirectlyComparable =
    IndirectRelation<R, projected<I1, P1>, projected<I2, P2>>;