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<cmath>: Tolerate 80-bit long double #6021

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<cmath>: Tolerate 80-bit long double #6021

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7 changes: 4 additions & 3 deletions stl/inc/cmath
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Original file line number Diff line number Diff line change
Expand Up @@ -1686,14 +1686,15 @@ _EXPORT_STD _NODISCARD constexpr inline double lerp(

_EXPORT_STD _NODISCARD constexpr inline long double lerp(
const long double _ArgA, const long double _ArgB, const long double _ArgT) noexcept {
return _Common_lerp(_ArgA, _ArgB, _ArgT);
return _Common_lerp(static_cast<double>(_ArgA), static_cast<double>(_ArgB), static_cast<double>(_ArgT));
}

_EXPORT_STD template <class _Ty1, class _Ty2, class _Ty3>
requires is_arithmetic_v<_Ty1> && is_arithmetic_v<_Ty2> && is_arithmetic_v<_Ty3>
_NODISCARD constexpr auto lerp(const _Ty1 _ArgA, const _Ty2 _ArgB, const _Ty3 _ArgT) noexcept {
using _Tgt = conditional_t<_Is_any_of_v<long double, _Ty1, _Ty2, _Ty3>, long double, double>;
return _Common_lerp(static_cast<_Tgt>(_ArgA), static_cast<_Tgt>(_ArgB), static_cast<_Tgt>(_ArgT));
using _Common = _Common_float_type_t<_Ty1, _Common_float_type_t<_Ty2, _Ty3>>;
return static_cast<_Common>(
_Common_lerp(static_cast<double>(_ArgA), static_cast<double>(_ArgB), static_cast<double>(_ArgT)));
}
#endif // _HAS_CXX20
_STD_END
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