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* [PATCH] libstdc++: Implement LWG 3557 change to convertible_to
@ 2021-06-18 15:12 Patrick Palka
  2021-06-18 15:19 ` Jonathan Wakely
  0 siblings, 1 reply; 2+ messages in thread
From: Patrick Palka @ 2021-06-18 15:12 UTC (permalink / raw)
  To: gcc-patches; +Cc: libstdc++, Patrick Palka

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


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] libstdc++: Implement LWG 3557 change to convertible_to
  2021-06-18 15:12 [PATCH] libstdc++: Implement LWG 3557 change to convertible_to Patrick Palka
@ 2021-06-18 15:19 ` Jonathan Wakely
  0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Wakely @ 2021-06-18 15:19 UTC (permalink / raw)
  To: Patrick Palka; +Cc: gcc-patches, libstdc++

OK, thanks.

On Fri, 18 Jun 2021 at 16:13, Patrick Palka via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> 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
>

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2021-06-18 15:19 ` Jonathan Wakely

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