diff options
Diffstat (limited to 'include/cmath')
| -rw-r--r-- | include/cmath | 35 |
1 files changed, 30 insertions, 5 deletions
diff --git a/include/cmath b/include/cmath index f5f62adcfb8d..f5864be5e11a 100644 --- a/include/cmath +++ b/include/cmath @@ -1,10 +1,9 @@ // -*- C++ -*- //===---------------------------- cmath -----------------------------------===// // -// The LLVM Compiler Infrastructure -// -// This file is dual licensed under the MIT and the University of Illinois Open -// Source Licenses. See LICENSE.TXT for details. +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// @@ -530,7 +529,7 @@ inline _LIBCPP_INLINE_VISIBILITY long double hypot( long double x, long double y template <class _A1, class _A2, class _A3> inline _LIBCPP_INLINE_VISIBILITY -typename __lazy_enable_if +typename _EnableIf < is_arithmetic<_A1>::value && is_arithmetic<_A2>::value && @@ -607,6 +606,32 @@ __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 |