1 | // -*- C++ -*- C library enhancements header. |
---|---|

2 | |

3 | // Copyright (C) 2016-2018 Free Software Foundation, Inc. |

4 | // |

5 | // This file is part of the GNU ISO C++ Library. This library is free |

6 | // software; you can redistribute it and/or modify it under the |

7 | // terms of the GNU General Public License as published by the |

8 | // Free Software Foundation; either version 3, or (at your option) |

9 | // any later version. |

10 | |

11 | // This library is distributed in the hope that it will be useful, |

12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |

13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |

14 | // GNU General Public License for more details. |

15 | |

16 | // Under Section 7 of GPL version 3, you are granted additional |

17 | // permissions described in the GCC Runtime Library Exception, version |

18 | // 3.1, as published by the Free Software Foundation. |

19 | |

20 | // You should have received a copy of the GNU General Public License and |

21 | // a copy of the GCC Runtime Library Exception along with this program; |

22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |

23 | // <http://www.gnu.org/licenses/>. |

24 | |

25 | /** @file include/bits/std_abs.h |

26 | * This is an internal header file, included by other library headers. |

27 | * Do not attempt to use it directly. @headername{cmath, cstdlib} |

28 | */ |

29 | |

30 | #ifndef _GLIBCXX_BITS_STD_ABS_H |

31 | #define _GLIBCXX_BITS_STD_ABS_H |

32 | |

33 | #pragma GCC system_header |

34 | |

35 | #include <bits/c++config.h> |

36 | |

37 | #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS |

38 | #include_next <stdlib.h> |

39 | #ifdef __CORRECT_ISO_CPP_MATH_H_PROTO |

40 | # include_next <math.h> |

41 | #endif |

42 | #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS |

43 | |

44 | #undef abs |

45 | |

46 | extern "C++" |

47 | { |

48 | namespace std _GLIBCXX_VISIBILITY(default) |

49 | { |

50 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |

51 | |

52 | using ::abs; |

53 | |

54 | #ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO |

55 | inline long |

56 | abs(long __i) { return __builtin_labs(__i); } |

57 | #endif |

58 | |

59 | #ifdef _GLIBCXX_USE_LONG_LONG |

60 | inline long long |

61 | abs(long long __x) { return __builtin_llabs (__x); } |

62 | #endif |

63 | |

64 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |

65 | // 2192. Validity and return type of std::abs(0u) is unclear |

66 | // 2294. <cstdlib> should declare abs(double) |

67 | |

68 | #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO |

69 | inline _GLIBCXX_CONSTEXPR double |

70 | abs(double __x) |

71 | { return __builtin_fabs(__x); } |

72 | |

73 | inline _GLIBCXX_CONSTEXPR float |

74 | abs(float __x) |

75 | { return __builtin_fabsf(__x); } |

76 | |

77 | inline _GLIBCXX_CONSTEXPR long double |

78 | abs(long double __x) |

79 | { return __builtin_fabsl(__x); } |

80 | #endif |

81 | |

82 | #if defined(__GLIBCXX_TYPE_INT_N_0) |

83 | inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_0 |

84 | abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; } |

85 | #endif |

86 | #if defined(__GLIBCXX_TYPE_INT_N_1) |

87 | inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_1 |

88 | abs(__GLIBCXX_TYPE_INT_N_1 __x) { return __x >= 0 ? __x : -__x; } |

89 | #endif |

90 | #if defined(__GLIBCXX_TYPE_INT_N_2) |

91 | inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_2 |

92 | abs(__GLIBCXX_TYPE_INT_N_2 __x) { return __x >= 0 ? __x : -__x; } |

93 | #endif |

94 | #if defined(__GLIBCXX_TYPE_INT_N_3) |

95 | inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_3 |

96 | abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; } |

97 | #endif |

98 | |

99 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) |

100 | inline _GLIBCXX_CONSTEXPR |

101 | __float128 |

102 | abs(__float128 __x) |

103 | { return __x < 0 ? -__x : __x; } |

104 | #endif |

105 | |

106 | _GLIBCXX_END_NAMESPACE_VERSION |

107 | } // namespace |

108 | } |

109 | |

110 | #endif // _GLIBCXX_BITS_STD_ABS_H |

111 |