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This is a partial implementation of the revised std::common_type rules from P0435R1. PR libstdc++/89102 (partial) * include/std/type_traits (common_type<>): Define. (common_type<T>): Derive from common_type<T, T>. * testsuite/20_util/common_type/requirements/explicit_instantiation.cc: Test zero-length template argument list. * testsuite/20_util/common_type/requirements/sfinae_friendly_1.cc: Test additional single argument cases. * testsuite/20_util/common_type/requirements/sfinae_friendly_2.cc: Adjust expected error. From-SVN: r268586
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.