std::indirectly_comparable - [alg.req.ind.cmp], concept indirectly_comparable

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                                                    libstdc++                   std::indirectly_comparable(3cxx)

       template<typename _I1, typename _I2, typename _Rel, typename _P1 identity, typename _P2 identity>
       concept std::indirectly_comparable =  indirect_binary_predicate<_Rel, projected<_I1, _P1>,
                                         projected<_I2, _P2>>

       [alg.req.ind.cmp], concept indirectly_comparable

       std::indirectly_comparable - [alg.req.ind.cmp], concept indirectly_comparable

       #include <iterator>