diff options
Diffstat (limited to 'libcxx/include')
| -rw-r--r-- | libcxx/include/cmath | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/libcxx/include/cmath b/libcxx/include/cmath index 3af9f548190..f618b1bf467 100644 --- a/libcxx/include/cmath +++ b/libcxx/include/cmath @@ -302,6 +302,7 @@ long double truncl(long double x); #include <__config> #include <math.h> +#include <algorithm> #include <version> #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) @@ -606,6 +607,32 @@ __libcpp_isfinite_or_builtin(_A1 __lcpp_x) _NOEXCEPT return isfinite(__lcpp_x); } +#if _LIBCPP_STD_VER > 17 +template <typename _Fp> +constexpr +_Fp __lerp(_Fp __a, _Fp __b, _Fp __t) noexcept { + if ((__a <= 0 && __b >= 0) || (__a >= 0 && __b <= 0)) + return __t * __b + (1 - __t) * __a; + + if (__t == 1) return __b; + const _Fp __x = __a + __t * (__b - __a); + if (__t > 1 == __b > __a) + return __b < __x ? __x : __b; + else + return __x < __b ? __x : __b; +} + +constexpr float +lerp(float __a, float __b, float __t) _NOEXCEPT { return __lerp(__a, __b, __t); } + +constexpr double +lerp(double __a, double __b, double __t) _NOEXCEPT { return __lerp(__a, __b, __t); } + +constexpr long double +lerp(long double __a, long double __b, long double __t) _NOEXCEPT { return __lerp(__a, __b, __t); } + +#endif // _LIBCPP_STD_VER > 17 + _LIBCPP_END_NAMESPACE_STD #endif // _LIBCPP_CMATH |
