std::experimental::ranges:: IndirectlyComparable

From cppreference.com

Defined in header `<experimental/ranges/iterator>`
template < class I1, class I2, class R = ranges:: equal_to <> , class P1 = ranges:: identity , class P2 = ranges:: identity > concept bool IndirectlyComparable = IndirectRelation < R, ranges :: projected < I1, P1 > , ranges :: projected < I2, P2 >> ;		(ranges TS)

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