@@ -314,6 +314,45 @@ namespace __debug
static_assert(_Int < _Nm, "index is out of bounds");
return std::move(__debug::get<_Int>(__arr));
}
+
+#if __cplusplus > 201703L
+#define __cpp_lib_to_array 201907L
+
+ template<bool _Move = false, typename _Tp, size_t... _Idx>
+ constexpr array<remove_cv_t<_Tp>, sizeof...(_Idx)>
+ __to_array(_Tp (&__a)[sizeof...(_Idx)], index_sequence<_Idx...>)
+ {
+ if constexpr (_Move)
+ return {{std::move(__a[_Idx])...}};
+ else
+ return {{__a[_Idx]...}};
+ }
+
+ template<typename _Tp, size_t _Nm>
+ constexpr array<remove_cv_t<_Tp>, _Nm>
+ to_array(_Tp (&__a)[_Nm])
+ noexcept(is_nothrow_constructible_v<_Tp, _Tp&>)
+ {
+ static_assert(!is_array_v<_Tp>);
+ static_assert(is_constructible_v<_Tp, _Tp&>);
+ if constexpr (is_constructible_v<_Tp, _Tp&>)
+ return __debug::__to_array(__a, make_index_sequence<_Nm>{});
+ __builtin_unreachable(); // FIXME: see PR c++/91388
+ }
+
+ template<typename _Tp, size_t _Nm>
+ constexpr array<remove_cv_t<_Tp>, _Nm>
+ to_array(_Tp (&&__a)[_Nm])
+ noexcept(is_nothrow_move_constructible_v<_Tp>)
+ {
+ static_assert(!is_array_v<_Tp>);
+ static_assert(is_move_constructible_v<_Tp>);
+ if constexpr (is_move_constructible_v<_Tp>)
+ return __debug::__to_array<1>(__a, make_index_sequence<_Nm>{});
+ __builtin_unreachable(); // FIXME: see PR c++/91388
+ }
+#endif // C++20
+
} // namespace __debug
_GLIBCXX_BEGIN_NAMESPACE_VERSION
* include/debug/array (to_array): Define for debug mode. Tested x86_64-linux, committed to trunk. commit 6404cc56a2e300ffcf5f680f0728e695539a137a Author: Jonathan Wakely <jwakely@redhat.com> Date: Thu Sep 26 15:50:30 2019 +0100 Define std::to_array for Debug Mode * include/debug/array (to_array): Define for debug mode.