[PATCH] libstdc++: Implement LWG 3557 change to convertible_to
Patrick Palka
ppalka@redhat.com
Fri Jun 18 15:12:01 GMT 2021
libstdc++-v3/ChangeLog:
* include/std/concepts (convertible_to): Just use declval as per
LWG 3557.
---
libstdc++-v3/include/std/concepts | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/libstdc++-v3/include/std/concepts b/libstdc++-v3/include/std/concepts
index 4490f534412..7f5421f1475 100644
--- a/libstdc++-v3/include/std/concepts
+++ b/libstdc++-v3/include/std/concepts
@@ -70,9 +70,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// [concept.convertible], concept convertible_to
template<typename _From, typename _To>
concept convertible_to = is_convertible_v<_From, _To>
- && requires(add_rvalue_reference_t<_From> (&__f)()) {
- static_cast<_To>(__f());
- };
+ && requires { static_cast<_To>(std::declval<_From>()); };
/// [concept.commonref], concept common_reference_with
template<typename _Tp, typename _Up>
--
2.32.0.93.g670b81a890
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