You need to CC libstd...@gcc.gnu.org for any patches touching libstdc++.
On Sat, 2023-03-18 at 21:21 -0700, Ken Matsui via Gcc-patches wrote:
> libstdc++-v3/ChangeLog:
>
> * include/std/type_traits (is_reference): Use __is_reference built-in
> trait.
Bad ChangeLog format. You should have a tab (not 4 or 8 spaces, nor
nothing) to indent the ChangeLog content.
Is there any benefit to use a builtin, instead of the existing
implementation? I can see no but maybe I'm stupid.
> ---
> diff --git a/libstdc++-v3/include/std/type_traits
> b/libstdc++-v3/include/std/type_traits
The patch fails to apply. It seems because your mail client inserted an
additional newline before "b/". Try to use git-send-email or configure
the mail client properly.
> index 2bd607a8b8f..18408d8ceb6 100644
> --- a/libstdc++-v3/include/std/type_traits
> +++ b/libstdc++-v3/include/std/type_traits
> @@ -639,6 +639,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> // Composite type categories.
>
> /// is_reference
> +#if __has_builtin(__is_reference)
> + template<typename _Tp>
> + struct is_reference
> + : public integral_constant<bool, __is_reference(_Tp)>
If a patch depends on another patch not applied yet, sent them in a
series. Or people are puzzled because when this patch is applied alone,
the code fails to build.
> + { };
> +#else
> template<typename _Tp>
> struct is_reference
> : public false_type
> @@ -653,6 +659,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> struct is_reference<_Tp&&>
> : public true_type
> { };
> +#endif
>
> /// is_arithmetic
> template<typename _Tp>
--
Xi Ruoyao <xry...@xry111.site>
School of Aerospace Science and Technology, Xidian University
