[PATCH] libstdc++: Add more template keywords to <mdspan> for Clang

[Tomasz Kaminski]

I was going to ask why you haven't committed it directly, but it looks like
it is already on master.
LGTM.

On Tue, Jul 8, 2025 at 11:34 PM Jonathan Wakely <jwakely@redhat.com> wrote:

> This fixes:
>
> include/c++/16.0.0/mdspan:1182:33: error: use 'template' keyword to treat
> 'mapping' as a dependent template name
>  1182 |               const typename _OLayout::mapping<_OExtents>&>
>       |                                        ^
> include/c++/16.0.0/mdspan:1185:31: error: use 'template' keyword to treat
> 'mapping' as a dependent template name
>  1185 |             const typename _OLayout::mapping<_OExtents>&,
> mapping_type>
>       |                                      ^
>
> libstdc++-v3/ChangeLog:
>
>         * include/std/mdspan (mdspan): Add template keyword for
>         dependent name.
> ---
>
> Tested x86_64-linux.
>
>  libstdc++-v3/include/std/mdspan | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libstdc++-v3/include/std/mdspan
> b/libstdc++-v3/include/std/mdspan
> index 5d16de5d9072..b34116a85e67 100644
> --- a/libstdc++-v3/include/std/mdspan
> +++ b/libstdc++-v3/include/std/mdspan
> @@ -1179,10 +1179,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>        template<typename _OElementType, typename _OExtents, typename
> _OLayout,
>                typename _OAccessor>
>         requires is_constructible_v<mapping_type,
> -             const typename _OLayout::mapping<_OExtents>&>
> +             const typename _OLayout::template mapping<_OExtents>&>
>           && is_constructible_v<accessor_type, const _OAccessor&>
>         constexpr explicit(!is_convertible_v<
> -           const typename _OLayout::mapping<_OExtents>&, mapping_type>
> +           const typename _OLayout::template mapping<_OExtents>&,
> mapping_type>
>           || !is_convertible_v<const _OAccessor&, accessor_type>)
>         mdspan(const mdspan<_OElementType, _OExtents, _OLayout,
> _OAccessor>&
>                  __other)
> --
> 2.50.0
>
>
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