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