https://gcc.gnu.org/g:139d65d1f5a60ac90479653a4f9b63618509f3f9
commit r15-1550-g139d65d1f5a60ac90479653a4f9b63618509f3f9 Author: Jonathan Wakely <jwak...@redhat.com> Date: Wed Jun 19 11:19:58 2024 +0100 libstdc++: Don't use std::__is_scalar in std::valarray initialization [PR115497] This removes the use of the std::__is_scalar trait from <valarray>, where it can be replaced by __is_trivial. It's used to decide whether we can use memset to value-initialize valarray elements, but memset is suitable for any trivial types, because value-initializing them is equivalent to filling them with zeros. This is another step towards removing the class templates in <bits/cpp_type_traits.h> that conflict with Clang built-in names. libstdc++-v3/ChangeLog: PR libstdc++/115497 * include/bits/valarray_array.h (__valarray_default_construct): Use __is_trivial(_Tp). instead of __is_scalar<_Tp>. Diff: --- libstdc++-v3/include/bits/valarray_array.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libstdc++-v3/include/bits/valarray_array.h b/libstdc++-v3/include/bits/valarray_array.h index 66b74f9aaac..07c49ce1057 100644 --- a/libstdc++-v3/include/bits/valarray_array.h +++ b/libstdc++-v3/include/bits/valarray_array.h @@ -80,7 +80,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Tp> struct _Array_default_ctor<_Tp, true> { - // For fundamental types, it suffices to say 'memset()' + // For trivial types, it suffices to say 'memset()' inline static void _S_do_it(_Tp* __b, _Tp* __e) { __builtin_memset(__b, 0, (__e - __b) * sizeof(_Tp)); } @@ -90,7 +90,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION inline void __valarray_default_construct(_Tp* __b, _Tp* __e) { - _Array_default_ctor<_Tp, __is_scalar<_Tp>::__value>::_S_do_it(__b, __e); + _Array_default_ctor<_Tp, __is_trivial(_Tp)>::_S_do_it(__b, __e); } // Turn a raw-memory into an array of _Tp filled with __t