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* include/bits/iterator_concepts.h (__iter_concept_impl): Add comments. (indirect_relation): Rename to indirect_binary_predicate and adjust definition as per P1716R3. (indirect_equivalence_relation): Define. (indirectly_comparable): Adjust definition. * include/std/concepts (equivalence_relation): Define. * testsuite/std/concepts/concepts.callable/relation.cc: Add tests for equivalence_relation. From-SVN: r278256
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.