[alg.req.ind.cmp] (original) (raw)

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

template<class I1, class I2, class R, class P1 = identity,class P2 = identity> concept indirectly_comparable = indirect_binary_predicate<R, projected<I1, P1>, projected<I2, P2>>;