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llvm-project/libcxx/include/cmath
Nikolas Klauser b9a2658a3e
[libc++][C++03] Use __cxx03/ headers in C++03 mode (#109002) 
This patch implements the forwarding to frozen C++03 headers as
discussed in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the
RFC, we initially proposed selecting the right headers from the Clang
driver, however consensus seemed to steer towards handling this in the
library itself. This patch implements that direction.

At a high level, the changes basically amount to making each public
header look like this:

```
// inside <vector>
#ifdef _LIBCPP_CXX03_LANG
#  include <__cxx03/vector>
#else
  // normal <vector> content
#endif
```

In most cases, public headers are simple umbrella headers so there isn't
much code in the #else branch. In other cases, the #else branch contains
the actual implementation of the header.
2024-12-21 13:01:48 +01:00

623 lines
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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_CMATH
#define _LIBCPP_CMATH
/*
cmath synopsis
Macros:
HUGE_VAL
HUGE_VALF // C99
HUGE_VALL // C99
INFINITY // C99
NAN // C99
FP_INFINITE // C99
FP_NAN // C99
FP_NORMAL // C99
FP_SUBNORMAL // C99
FP_ZERO // C99
FP_FAST_FMA // C99
FP_FAST_FMAF // C99
FP_FAST_FMAL // C99
FP_ILOGB0 // C99
FP_ILOGBNAN // C99
MATH_ERRNO // C99
MATH_ERREXCEPT // C99
math_errhandling // C99
namespace std
{
Types:
float_t // C99
double_t // C99
// C90
floating_point abs(floating_point x);
floating_point acos (arithmetic x);
float acosf(float x);
long double acosl(long double x);
floating_point asin (arithmetic x);
float asinf(float x);
long double asinl(long double x);
floating_point atan (arithmetic x);
float atanf(float x);
long double atanl(long double x);
floating_point atan2 (arithmetic y, arithmetic x);
float atan2f(float y, float x);
long double atan2l(long double y, long double x);
floating_point ceil (arithmetic x);
float ceilf(float x);
long double ceill(long double x);
floating_point cos (arithmetic x);
float cosf(float x);
long double cosl(long double x);
floating_point cosh (arithmetic x);
float coshf(float x);
long double coshl(long double x);
floating_point exp (arithmetic x);
float expf(float x);
long double expl(long double x);
floating_point fabs (arithmetic x);
float fabsf(float x);
long double fabsl(long double x);
floating_point floor (arithmetic x);
float floorf(float x);
long double floorl(long double x);
floating_point fmod (arithmetic x, arithmetic y);
float fmodf(float x, float y);
long double fmodl(long double x, long double y);
floating_point frexp (arithmetic value, int* exp);
float frexpf(float value, int* exp);
long double frexpl(long double value, int* exp);
floating_point ldexp (arithmetic value, int exp);
float ldexpf(float value, int exp);
long double ldexpl(long double value, int exp);
floating_point log (arithmetic x);
float logf(float x);
long double logl(long double x);
floating_point log10 (arithmetic x);
float log10f(float x);
long double log10l(long double x);
floating_point modf (floating_point value, floating_point* iptr);
float modff(float value, float* iptr);
long double modfl(long double value, long double* iptr);
floating_point pow (arithmetic x, arithmetic y);
float powf(float x, float y);
long double powl(long double x, long double y);
floating_point sin (arithmetic x);
float sinf(float x);
long double sinl(long double x);
floating_point sinh (arithmetic x);
float sinhf(float x);
long double sinhl(long double x);
floating_point sqrt (arithmetic x);
float sqrtf(float x);
long double sqrtl(long double x);
floating_point tan (arithmetic x);
float tanf(float x);
long double tanl(long double x);
floating_point tanh (arithmetic x);
float tanhf(float x);
long double tanhl(long double x);
// C99
bool signbit(arithmetic x);
int fpclassify(arithmetic x);
bool isfinite(arithmetic x);
bool isinf(arithmetic x);
bool isnan(arithmetic x);
bool isnormal(arithmetic x);
bool isgreater(arithmetic x, arithmetic y);
bool isgreaterequal(arithmetic x, arithmetic y);
bool isless(arithmetic x, arithmetic y);
bool islessequal(arithmetic x, arithmetic y);
bool islessgreater(arithmetic x, arithmetic y);
bool isunordered(arithmetic x, arithmetic y);
floating_point acosh (arithmetic x);
float acoshf(float x);
long double acoshl(long double x);
floating_point asinh (arithmetic x);
float asinhf(float x);
long double asinhl(long double x);
floating_point atanh (arithmetic x);
float atanhf(float x);
long double atanhl(long double x);
floating_point cbrt (arithmetic x);
float cbrtf(float x);
long double cbrtl(long double x);
floating_point copysign (arithmetic x, arithmetic y);
float copysignf(float x, float y);
long double copysignl(long double x, long double y);
floating_point erf (arithmetic x);
float erff(float x);
long double erfl(long double x);
floating_point erfc (arithmetic x);
float erfcf(float x);
long double erfcl(long double x);
floating_point exp2 (arithmetic x);
float exp2f(float x);
long double exp2l(long double x);
floating_point expm1 (arithmetic x);
float expm1f(float x);
long double expm1l(long double x);
floating_point fdim (arithmetic x, arithmetic y);
float fdimf(float x, float y);
long double fdiml(long double x, long double y);
floating_point fma (arithmetic x, arithmetic y, arithmetic z);
float fmaf(float x, float y, float z);
long double fmal(long double x, long double y, long double z);
floating_point fmax (arithmetic x, arithmetic y);
float fmaxf(float x, float y);
long double fmaxl(long double x, long double y);
floating_point fmin (arithmetic x, arithmetic y);
float fminf(float x, float y);
long double fminl(long double x, long double y);
double hermite(unsigned n, double x); // C++17
float hermite(unsigned n, float x); // C++17
long double hermite(unsigned n, long double x); // C++17
float hermitef(unsigned n, float x); // C++17
long double hermitel(unsigned n, long double x); // C++17
template <class Integer>
double hermite(unsigned n, Integer x); // C++17
floating_point hypot (arithmetic x, arithmetic y);
float hypotf(float x, float y);
long double hypotl(long double x, long double y);
double hypot(double x, double y, double z); // C++17
float hypot(float x, float y, float z); // C++17
long double hypot(long double x, long double y, long double z); // C++17
int ilogb (arithmetic x);
int ilogbf(float x);
int ilogbl(long double x);
floating_point lgamma (arithmetic x);
float lgammaf(float x);
long double lgammal(long double x);
long long llrint (arithmetic x);
long long llrintf(float x);
long long llrintl(long double x);
long long llround (arithmetic x);
long long llroundf(float x);
long long llroundl(long double x);
floating_point log1p (arithmetic x);
float log1pf(float x);
long double log1pl(long double x);
floating_point log2 (arithmetic x);
float log2f(float x);
long double log2l(long double x);
floating_point logb (arithmetic x);
float logbf(float x);
long double logbl(long double x);
long lrint (arithmetic x);
long lrintf(float x);
long lrintl(long double x);
long lround (arithmetic x);
long lroundf(float x);
long lroundl(long double x);
double nan (const char* str);
float nanf(const char* str);
long double nanl(const char* str);
floating_point nearbyint (arithmetic x);
float nearbyintf(float x);
long double nearbyintl(long double x);
floating_point nextafter (arithmetic x, arithmetic y);
float nextafterf(float x, float y);
long double nextafterl(long double x, long double y);
floating_point nexttoward (arithmetic x, long double y);
float nexttowardf(float x, long double y);
long double nexttowardl(long double x, long double y);
floating_point remainder (arithmetic x, arithmetic y);
float remainderf(float x, float y);
long double remainderl(long double x, long double y);
floating_point remquo (arithmetic x, arithmetic y, int* pquo);
float remquof(float x, float y, int* pquo);
long double remquol(long double x, long double y, int* pquo);
floating_point rint (arithmetic x);
float rintf(float x);
long double rintl(long double x);
floating_point round (arithmetic x);
float roundf(float x);
long double roundl(long double x);
floating_point scalbln (arithmetic x, long ex);
float scalblnf(float x, long ex);
long double scalblnl(long double x, long ex);
floating_point scalbn (arithmetic x, int ex);
float scalbnf(float x, int ex);
long double scalbnl(long double x, int ex);
floating_point tgamma (arithmetic x);
float tgammaf(float x);
long double tgammal(long double x);
floating_point trunc (arithmetic x);
float truncf(float x);
long double truncl(long double x);
constexpr float lerp(float a, float b, float t) noexcept; // C++20
constexpr double lerp(double a, double b, double t) noexcept; // C++20
constexpr long double lerp(long double a, long double b, long double t) noexcept; // C++20
} // std
*/
#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
# include <__cxx03/cmath>
#else
# include <__config>
# include <__math/hypot.h>
# include <__type_traits/enable_if.h>
# include <__type_traits/is_arithmetic.h>
# include <__type_traits/is_constant_evaluated.h>
# include <__type_traits/is_floating_point.h>
# include <__type_traits/is_same.h>
# include <__type_traits/promote.h>
# include <__type_traits/remove_cv.h>
# include <limits>
# include <version>
# include <__math/special_functions.h>
# include <math.h>
# ifndef _LIBCPP_MATH_H
# error <cmath> tried including <math.h> but didn't find libc++'s <math.h> header. \
This usually means that your header search paths are not configured properly. \
The header search paths should contain the C++ Standard Library headers before \
any C Standard Library, and you are probably using compiler flags that make that \
not be the case.
# endif
# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
# endif
_LIBCPP_PUSH_MACROS
# include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
using ::signbit _LIBCPP_USING_IF_EXISTS;
using ::fpclassify _LIBCPP_USING_IF_EXISTS;
using ::isfinite _LIBCPP_USING_IF_EXISTS;
using ::isinf _LIBCPP_USING_IF_EXISTS;
using ::isnan _LIBCPP_USING_IF_EXISTS;
using ::isnormal _LIBCPP_USING_IF_EXISTS;
using ::isgreater _LIBCPP_USING_IF_EXISTS;
using ::isgreaterequal _LIBCPP_USING_IF_EXISTS;
using ::isless _LIBCPP_USING_IF_EXISTS;
using ::islessequal _LIBCPP_USING_IF_EXISTS;
using ::islessgreater _LIBCPP_USING_IF_EXISTS;
using ::isunordered _LIBCPP_USING_IF_EXISTS;
using ::isunordered _LIBCPP_USING_IF_EXISTS;
using ::float_t _LIBCPP_USING_IF_EXISTS;
using ::double_t _LIBCPP_USING_IF_EXISTS;
using ::abs _LIBCPP_USING_IF_EXISTS;
using ::acos _LIBCPP_USING_IF_EXISTS;
using ::acosf _LIBCPP_USING_IF_EXISTS;
using ::asin _LIBCPP_USING_IF_EXISTS;
using ::asinf _LIBCPP_USING_IF_EXISTS;
using ::atan _LIBCPP_USING_IF_EXISTS;
using ::atanf _LIBCPP_USING_IF_EXISTS;
using ::atan2 _LIBCPP_USING_IF_EXISTS;
using ::atan2f _LIBCPP_USING_IF_EXISTS;
using ::ceil _LIBCPP_USING_IF_EXISTS;
using ::ceilf _LIBCPP_USING_IF_EXISTS;
using ::cos _LIBCPP_USING_IF_EXISTS;
using ::cosf _LIBCPP_USING_IF_EXISTS;
using ::cosh _LIBCPP_USING_IF_EXISTS;
using ::coshf _LIBCPP_USING_IF_EXISTS;
using ::exp _LIBCPP_USING_IF_EXISTS;
using ::expf _LIBCPP_USING_IF_EXISTS;
using ::fabs _LIBCPP_USING_IF_EXISTS;
using ::fabsf _LIBCPP_USING_IF_EXISTS;
using ::floor _LIBCPP_USING_IF_EXISTS;
using ::floorf _LIBCPP_USING_IF_EXISTS;
using ::fmod _LIBCPP_USING_IF_EXISTS;
using ::fmodf _LIBCPP_USING_IF_EXISTS;
using ::frexp _LIBCPP_USING_IF_EXISTS;
using ::frexpf _LIBCPP_USING_IF_EXISTS;
using ::ldexp _LIBCPP_USING_IF_EXISTS;
using ::ldexpf _LIBCPP_USING_IF_EXISTS;
using ::log _LIBCPP_USING_IF_EXISTS;
using ::logf _LIBCPP_USING_IF_EXISTS;
using ::log10 _LIBCPP_USING_IF_EXISTS;
using ::log10f _LIBCPP_USING_IF_EXISTS;
using ::modf _LIBCPP_USING_IF_EXISTS;
using ::modff _LIBCPP_USING_IF_EXISTS;
using ::pow _LIBCPP_USING_IF_EXISTS;
using ::powf _LIBCPP_USING_IF_EXISTS;
using ::sin _LIBCPP_USING_IF_EXISTS;
using ::sinf _LIBCPP_USING_IF_EXISTS;
using ::sinh _LIBCPP_USING_IF_EXISTS;
using ::sinhf _LIBCPP_USING_IF_EXISTS;
using ::sqrt _LIBCPP_USING_IF_EXISTS;
using ::sqrtf _LIBCPP_USING_IF_EXISTS;
using ::tan _LIBCPP_USING_IF_EXISTS;
using ::tanf _LIBCPP_USING_IF_EXISTS;
using ::tanh _LIBCPP_USING_IF_EXISTS;
using ::tanhf _LIBCPP_USING_IF_EXISTS;
using ::acosh _LIBCPP_USING_IF_EXISTS;
using ::acoshf _LIBCPP_USING_IF_EXISTS;
using ::asinh _LIBCPP_USING_IF_EXISTS;
using ::asinhf _LIBCPP_USING_IF_EXISTS;
using ::atanh _LIBCPP_USING_IF_EXISTS;
using ::atanhf _LIBCPP_USING_IF_EXISTS;
using ::cbrt _LIBCPP_USING_IF_EXISTS;
using ::cbrtf _LIBCPP_USING_IF_EXISTS;
using ::copysign _LIBCPP_USING_IF_EXISTS;
using ::copysignf _LIBCPP_USING_IF_EXISTS;
using ::erf _LIBCPP_USING_IF_EXISTS;
using ::erff _LIBCPP_USING_IF_EXISTS;
using ::erfc _LIBCPP_USING_IF_EXISTS;
using ::erfcf _LIBCPP_USING_IF_EXISTS;
using ::exp2 _LIBCPP_USING_IF_EXISTS;
using ::exp2f _LIBCPP_USING_IF_EXISTS;
using ::expm1 _LIBCPP_USING_IF_EXISTS;
using ::expm1f _LIBCPP_USING_IF_EXISTS;
using ::fdim _LIBCPP_USING_IF_EXISTS;
using ::fdimf _LIBCPP_USING_IF_EXISTS;
using ::fmaf _LIBCPP_USING_IF_EXISTS;
using ::fma _LIBCPP_USING_IF_EXISTS;
using ::fmax _LIBCPP_USING_IF_EXISTS;
using ::fmaxf _LIBCPP_USING_IF_EXISTS;
using ::fmin _LIBCPP_USING_IF_EXISTS;
using ::fminf _LIBCPP_USING_IF_EXISTS;
using ::hypot _LIBCPP_USING_IF_EXISTS;
using ::hypotf _LIBCPP_USING_IF_EXISTS;
using ::ilogb _LIBCPP_USING_IF_EXISTS;
using ::ilogbf _LIBCPP_USING_IF_EXISTS;
using ::lgamma _LIBCPP_USING_IF_EXISTS;
using ::lgammaf _LIBCPP_USING_IF_EXISTS;
using ::llrint _LIBCPP_USING_IF_EXISTS;
using ::llrintf _LIBCPP_USING_IF_EXISTS;
using ::llround _LIBCPP_USING_IF_EXISTS;
using ::llroundf _LIBCPP_USING_IF_EXISTS;
using ::log1p _LIBCPP_USING_IF_EXISTS;
using ::log1pf _LIBCPP_USING_IF_EXISTS;
using ::log2 _LIBCPP_USING_IF_EXISTS;
using ::log2f _LIBCPP_USING_IF_EXISTS;
using ::logb _LIBCPP_USING_IF_EXISTS;
using ::logbf _LIBCPP_USING_IF_EXISTS;
using ::lrint _LIBCPP_USING_IF_EXISTS;
using ::lrintf _LIBCPP_USING_IF_EXISTS;
using ::lround _LIBCPP_USING_IF_EXISTS;
using ::lroundf _LIBCPP_USING_IF_EXISTS;
using ::nan _LIBCPP_USING_IF_EXISTS;
using ::nanf _LIBCPP_USING_IF_EXISTS;
using ::nearbyint _LIBCPP_USING_IF_EXISTS;
using ::nearbyintf _LIBCPP_USING_IF_EXISTS;
using ::nextafter _LIBCPP_USING_IF_EXISTS;
using ::nextafterf _LIBCPP_USING_IF_EXISTS;
using ::nexttoward _LIBCPP_USING_IF_EXISTS;
using ::nexttowardf _LIBCPP_USING_IF_EXISTS;
using ::remainder _LIBCPP_USING_IF_EXISTS;
using ::remainderf _LIBCPP_USING_IF_EXISTS;
using ::remquo _LIBCPP_USING_IF_EXISTS;
using ::remquof _LIBCPP_USING_IF_EXISTS;
using ::rint _LIBCPP_USING_IF_EXISTS;
using ::rintf _LIBCPP_USING_IF_EXISTS;
using ::round _LIBCPP_USING_IF_EXISTS;
using ::roundf _LIBCPP_USING_IF_EXISTS;
using ::scalbln _LIBCPP_USING_IF_EXISTS;
using ::scalblnf _LIBCPP_USING_IF_EXISTS;
using ::scalbn _LIBCPP_USING_IF_EXISTS;
using ::scalbnf _LIBCPP_USING_IF_EXISTS;
using ::tgamma _LIBCPP_USING_IF_EXISTS;
using ::tgammaf _LIBCPP_USING_IF_EXISTS;
using ::trunc _LIBCPP_USING_IF_EXISTS;
using ::truncf _LIBCPP_USING_IF_EXISTS;
using ::acosl _LIBCPP_USING_IF_EXISTS;
using ::asinl _LIBCPP_USING_IF_EXISTS;
using ::atanl _LIBCPP_USING_IF_EXISTS;
using ::atan2l _LIBCPP_USING_IF_EXISTS;
using ::ceill _LIBCPP_USING_IF_EXISTS;
using ::cosl _LIBCPP_USING_IF_EXISTS;
using ::coshl _LIBCPP_USING_IF_EXISTS;
using ::expl _LIBCPP_USING_IF_EXISTS;
using ::fabsl _LIBCPP_USING_IF_EXISTS;
using ::floorl _LIBCPP_USING_IF_EXISTS;
using ::fmodl _LIBCPP_USING_IF_EXISTS;
using ::frexpl _LIBCPP_USING_IF_EXISTS;
using ::ldexpl _LIBCPP_USING_IF_EXISTS;
using ::logl _LIBCPP_USING_IF_EXISTS;
using ::log10l _LIBCPP_USING_IF_EXISTS;
using ::modfl _LIBCPP_USING_IF_EXISTS;
using ::powl _LIBCPP_USING_IF_EXISTS;
using ::sinl _LIBCPP_USING_IF_EXISTS;
using ::sinhl _LIBCPP_USING_IF_EXISTS;
using ::sqrtl _LIBCPP_USING_IF_EXISTS;
using ::tanl _LIBCPP_USING_IF_EXISTS;
using ::tanhl _LIBCPP_USING_IF_EXISTS;
using ::acoshl _LIBCPP_USING_IF_EXISTS;
using ::asinhl _LIBCPP_USING_IF_EXISTS;
using ::atanhl _LIBCPP_USING_IF_EXISTS;
using ::cbrtl _LIBCPP_USING_IF_EXISTS;
using ::copysignl _LIBCPP_USING_IF_EXISTS;
using ::erfl _LIBCPP_USING_IF_EXISTS;
using ::erfcl _LIBCPP_USING_IF_EXISTS;
using ::exp2l _LIBCPP_USING_IF_EXISTS;
using ::expm1l _LIBCPP_USING_IF_EXISTS;
using ::fdiml _LIBCPP_USING_IF_EXISTS;
using ::fmal _LIBCPP_USING_IF_EXISTS;
using ::fmaxl _LIBCPP_USING_IF_EXISTS;
using ::fminl _LIBCPP_USING_IF_EXISTS;
using ::hypotl _LIBCPP_USING_IF_EXISTS;
using ::ilogbl _LIBCPP_USING_IF_EXISTS;
using ::lgammal _LIBCPP_USING_IF_EXISTS;
using ::llrintl _LIBCPP_USING_IF_EXISTS;
using ::llroundl _LIBCPP_USING_IF_EXISTS;
using ::log1pl _LIBCPP_USING_IF_EXISTS;
using ::log2l _LIBCPP_USING_IF_EXISTS;
using ::logbl _LIBCPP_USING_IF_EXISTS;
using ::lrintl _LIBCPP_USING_IF_EXISTS;
using ::lroundl _LIBCPP_USING_IF_EXISTS;
using ::nanl _LIBCPP_USING_IF_EXISTS;
using ::nearbyintl _LIBCPP_USING_IF_EXISTS;
using ::nextafterl _LIBCPP_USING_IF_EXISTS;
using ::nexttowardl _LIBCPP_USING_IF_EXISTS;
using ::remainderl _LIBCPP_USING_IF_EXISTS;
using ::remquol _LIBCPP_USING_IF_EXISTS;
using ::rintl _LIBCPP_USING_IF_EXISTS;
using ::roundl _LIBCPP_USING_IF_EXISTS;
using ::scalblnl _LIBCPP_USING_IF_EXISTS;
using ::scalbnl _LIBCPP_USING_IF_EXISTS;
using ::tgammal _LIBCPP_USING_IF_EXISTS;
using ::truncl _LIBCPP_USING_IF_EXISTS;
template <class _A1, __enable_if_t<is_floating_point<_A1>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool __constexpr_isinf(_A1 __lcpp_x) _NOEXCEPT {
# if __has_builtin(__builtin_isinf)
return __builtin_isinf(__lcpp_x);
# else
return isinf(__lcpp_x);
# endif
}
template <class _A1, __enable_if_t<!is_floating_point<_A1>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool __constexpr_isinf(_A1 __lcpp_x) _NOEXCEPT {
return std::isinf(__lcpp_x);
}
# if _LIBCPP_STD_VER >= 20
template <typename _Fp>
_LIBCPP_HIDE_FROM_ABI 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;
}
_LIBCPP_HIDE_FROM_ABI inline constexpr float lerp(float __a, float __b, float __t) _NOEXCEPT {
return __lerp(__a, __b, __t);
}
_LIBCPP_HIDE_FROM_ABI inline constexpr double lerp(double __a, double __b, double __t) _NOEXCEPT {
return __lerp(__a, __b, __t);
}
_LIBCPP_HIDE_FROM_ABI inline constexpr long double lerp(long double __a, long double __b, long double __t) _NOEXCEPT {
return __lerp(__a, __b, __t);
}
template <class _A1, class _A2, class _A3>
inline _LIBCPP_HIDE_FROM_ABI constexpr
typename enable_if_t< is_arithmetic<_A1>::value && is_arithmetic<_A2>::value && is_arithmetic<_A3>::value,
__promote<_A1, _A2, _A3> >::type
lerp(_A1 __a, _A2 __b, _A3 __t) noexcept {
typedef typename __promote<_A1, _A2, _A3>::type __result_type;
static_assert(!(
_IsSame<_A1, __result_type>::value && _IsSame<_A2, __result_type>::value && _IsSame<_A3, __result_type>::value));
return std::__lerp((__result_type)__a, (__result_type)__b, (__result_type)__t);
}
# endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
# include <type_traits>
# endif
#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
#endif // _LIBCPP_CMATH
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