libcxx/include/__math/gamma.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___MATH_GAMMA_H
  10 #define _LIBCPP___MATH_GAMMA_H
  11
  12 #include <__config>
  13 #include <__type_traits/enable_if.h>
  14 #include <__type_traits/is_integral.h>
  15
  16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  17 #  pragma GCC system_header
  18 #endif
  19
  20 _LIBCPP_BEGIN_NAMESPACE_STD
  21
  22 namespace __math {
  23
  24 // lgamma
  25
  26 inline _LIBCPP_HIDE_FROM_ABI float lgamma(float __x) _NOEXCEPT { return __builtin_lgammaf(__x); }
  27
  28 template <class = int>
  29 _LIBCPP_HIDE_FROM_ABI double lgamma(double __x) _NOEXCEPT {
  30   return __builtin_lgamma(__x);
  31 }
  32
  33 inline _LIBCPP_HIDE_FROM_ABI long double lgamma(long double __x) _NOEXCEPT { return __builtin_lgammal(__x); }
  34
  35 template <class _A1, __enable_if_t<is_integral<_A1>::value, int> = 0>
  36 inline _LIBCPP_HIDE_FROM_ABI double lgamma(_A1 __x) _NOEXCEPT {
  37   return __builtin_lgamma((double)__x);
  38 }
  39
  40 // nan
  41
  42 // tgamma
  43
  44 inline _LIBCPP_HIDE_FROM_ABI float tgamma(float __x) _NOEXCEPT { return __builtin_tgammaf(__x); }
  45
  46 template <class = int>
  47 _LIBCPP_HIDE_FROM_ABI double tgamma(double __x) _NOEXCEPT {
  48   return __builtin_tgamma(__x);
  49 }
  50
  51 inline _LIBCPP_HIDE_FROM_ABI long double tgamma(long double __x) _NOEXCEPT { return __builtin_tgammal(__x); }
  52
  53 template <class _A1, __enable_if_t<is_integral<_A1>::value, int> = 0>
  54 inline _LIBCPP_HIDE_FROM_ABI double tgamma(_A1 __x) _NOEXCEPT {
  55   return __builtin_tgamma((double)__x);
  56 }
  57
  58 } // namespace __math
  59
  60 _LIBCPP_END_NAMESPACE_STD
  61
  62 #endif // _LIBCPP___MATH_GAMMA_H