[PATCH] libstdc++: Don't constrain some enable_borrowed_range specializations

[Jonathan Wakely]

On 04/05/21 21:42 -0400, Patrick Palka via Libstdc++ wrote:
>These constraints are already present on the template we're partially
>specilalizing for.
>
>[ This was recently fixed editorially in
>https://github.com/cplusplus/draft/pull/4519 ]
>
>Tested on x86_64-pc-linux-gnu, does this look OK for trunk?

Yes, thanks.

>libstdc++-v3/ChangeLog:
>
>	* include/bits/ranges_util.h (enable_borrowed_range<subrange>):
>	Remove constraints on this partial specialization.
>	* include/std/ranges (enable_borrowed_range<iota_view>):
>	Likewise.
>---
> libstdc++-v3/include/bits/ranges_util.h | 3 +--
> libstdc++-v3/include/std/ranges         | 2 +-
> 2 files changed, 2 insertions(+), 3 deletions(-)
>
>diff --git a/libstdc++-v3/include/bits/ranges_util.h b/libstdc++-v3/include/bits/ranges_util.h
>index 589886eb157..b73fc121e0f 100644
>--- a/libstdc++-v3/include/bits/ranges_util.h
>+++ b/libstdc++-v3/include/bits/ranges_util.h
>@@ -381,8 +381,7 @@ namespace ranges
> 	return __r.end();
>     }
>
>-  template<input_or_output_iterator _It, sentinel_for<_It> _Sent,
>-	   subrange_kind _Kind>
>+  template<typename _It, typename _Sent, subrange_kind _Kind>
>     inline constexpr bool
>       enable_borrowed_range<subrange<_It, _Sent, _Kind>> = true;
>
>diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
>index f21e08a36e3..2305bd200a5 100644
>--- a/libstdc++-v3/include/std/ranges
>+++ b/libstdc++-v3/include/std/ranges
>@@ -586,7 +586,7 @@ namespace ranges
> 	    == __detail::__is_signed_integer_like<_Bound>))
>     iota_view(_Winc, _Bound) -> iota_view<_Winc, _Bound>;
>
>-  template<weakly_incrementable _Winc, semiregular _Bound>
>+  template<typename _Winc, typename _Bound>
>     inline constexpr bool
>       enable_borrowed_range<iota_view<_Winc, _Bound>> = true;
>
>-- 
>2.31.1.442.g7e39198978
>