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

[Jonathan Wakely via Gcc-patches]

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