2020-04-20 Jonathan Wakely <jwakely@redhat.com>
+ * include/std/version (__cpp_lib_three_way_comparison): Update value.
+ * libsupc++/compare (__cpp_lib_three_way_comparison): Likewise.
+
* include/bits/stl_map.h (map): Define operator<=> and remove
operator< for C++20.
* include/bits/stl_multimap.h (multimap): Likewise.
#endif
#define __cpp_lib_span 202002L
#if __cpp_impl_three_way_comparison >= 201907L && __cpp_lib_concepts
-# define __cpp_lib_three_way_comparison 201711L
+# define __cpp_lib_three_way_comparison 201907L
#endif
#define __cpp_lib_to_array 201907L
#endif
#include <concepts>
#if __cpp_lib_concepts
-# define __cpp_lib_three_way_comparison 201711L
+# define __cpp_lib_three_way_comparison 201907L
#endif
namespace std
namespace __detail
{
- // [expos.only.func]
+ // [expos.only.func] synth-three-way
inline constexpr struct _Synth3way
{
template<typename _Tp, typename _Up>
+ static constexpr bool
+ _S_noexcept(const _Tp* __t = nullptr, const _Up* __u = nullptr)
+ {
+ if constexpr (three_way_comparable_with<_Tp, _Up>)
+ return noexcept(*__t <=> *__u);
+ else
+ return noexcept(*__t < *__u) && noexcept(*__u < *__t);
+ }
+
+ template<typename _Tp, typename _Up>
constexpr auto
operator()(const _Tp& __t, const _Up& __u) const
+ noexcept(_S_noexcept<_Tp, _Up>())
requires requires
{
{ __t < __u } -> __boolean_testable;
}
} __synth3way = {};
+ // [expos.only.func] synth-three-way-result
template<typename _Tp, typename _Up = _Tp>
using __synth3way_t
= decltype(__detail::__synth3way(std::declval<_Tp&>(),