# std::experimental::ranges::IndirectRelation

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< cpp‎ | experimental‎ | ranges

Defined in header `<experimental/ranges/iterator>` |  |
template< class F, class I1, class I2 = I1 > concept bool IndirectRelation = Readable<I1> && Readable<I2> && CopyConstructible<F> && Relation<F&, ranges::value_type_t<I1>&, ranges::value_type_t<I2>&> && Relation<F&, ranges::value_type_t<I1>&, ranges::reference_t<I2>> && Relation<F&, ranges::reference_t<I1>, ranges::value_type_t<I2>&> && Relation<F&, ranges::reference_t<I1>, ranges::reference_t<I2>> && Relation<F&, ranges::iter_common_reference_t<I1>, ranges::iter_common_reference_t<I2>>; |  | (ranges TS)

| This section is incomplete Reason: add description and extra caveats

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