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libstdc++: Use __promote_3 for std::hypot [PR121097] 

The __promoted_t alias is only defined when __cpp_fold_expressions is
defined, which might not be the case for some hypothetical C++17
compilers.

Change the 3-arg std::hypot to just use __gnu_cxx::__promote_3 which is
always available.

libstdc++-v3/ChangeLog:

	PR libstdc++/121097
	* include/c_global/cmath (hypot): Use __promote_3 instead of
	__promoted.

Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
This commit is contained in:
Jonathan Wakely 2025-07-15 21:29:33 +01:00 committed by Jonathan Wakely
parent d626debcb3
commit f4932c59df
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libstdc++-v3/include/c_global/cmath
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@ -3792,10 +3792,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ return std::__hypot3<long double>(__x, __y, __z); } { return std::__hypot3<long double>(__x, __y, __z); }
template<typename _Tp, typename _Up, typename _Vp> template<typename _Tp, typename _Up, typename _Vp>
__gnu_cxx::__promoted_t<_Tp, _Up, _Vp> typename __gnu_cxx::__promote_3<_Tp, _Up, _Vp>::__type
hypot(_Tp __x, _Up __y, _Vp __z) hypot(_Tp __x, _Up __y, _Vp __z)
{ {
using __type = __gnu_cxx::__promoted_t<_Tp, _Up, _Vp>; using __type = typename __gnu_cxx::__promote_3<_Tp, _Up, _Vp>::__type;
return std::__hypot3<__type>(__x, __y, __z); return std::__hypot3<__type>(__x, __y, __z);
} }