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This is incomplete because std::strong_order doesn't support floating-point types. The partial_order and weak_order tests use VERIFY instead of static_assert because of PR 92431. * libsupc++/compare (strong_order, weak_order, partial_order) (compare_strong_order_fallback, compare_weak_order_fallback) (compare_partial_order_fallback): Define customization point objects for C++20. * testsuite/18_support/comparisons/algorithms/partial_order.cc: New test. * testsuite/18_support/comparisons/algorithms/strong_order.cc: New test. * testsuite/18_support/comparisons/algorithms/weak_order.cc: New test. From-SVN: r278149
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.