libstdc++: Simplify std::totally_ordered_with (LWG 3329)

	* include/std/concepts (totally_ordered_with): Remove redundant
	requirement (LWG 3329).

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 6e22536..3941bcb 100644 (file)
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,8 @@
 2020-02-19  Jonathan Wakely  <jwakely@redhat.com>
 
+       * include/std/concepts (totally_ordered_with): Remove redundant
+       requirement (LWG 3329).
+
        * include/std/ranges (__detail::__convertible_to_non_slicing): New
        helper concept.
        (__detail::__pair_like_convertible_to): Remove.

diff --git a/libstdc++-v3/include/std/concepts b/libstdc++-v3/include/std/concepts
index f3db40b..be125c6 100644 (file)
--- a/libstdc++-v3/include/std/concepts
+++ b/libstdc++-v3/include/std/concepts
@@ -311,10 +311,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _Tp, typename _Up>
     concept totally_ordered_with
       = totally_ordered<_Tp> && totally_ordered<_Up>
-      && common_reference_with<__detail::__cref<_Tp>, __detail::__cref<_Up>>
+      && equality_comparable_with<_Tp, _Up>
       && totally_ordered<common_reference_t<__detail::__cref<_Tp>,
                                            __detail::__cref<_Up>>>
-      && equality_comparable_with<_Tp, _Up>
       && requires(__detail::__cref<_Tp> __t, __detail::__cref<_Up> __u) {
        { __t <  __u } -> __detail::__boolean_testable;
        { __t >  __u } -> __detail::__boolean_testable;