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- // Special functions -*- C++ -*-
- // Copyright (C) 2006-2022 Free Software Foundation, Inc.
- //
- // This file is part of the GNU ISO C++ Library. This library is free
- // software; you can redistribute it and/or modify it under the
- // terms of the GNU General Public License as published by the
- // Free Software Foundation; either version 3, or (at your option)
- // any later version.
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // Under Section 7 of GPL version 3, you are granted additional
- // permissions described in the GCC Runtime Library Exception, version
- // 3.1, as published by the Free Software Foundation.
- // You should have received a copy of the GNU General Public License and
- // a copy of the GCC Runtime Library Exception along with this program;
- // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
- // <http://www.gnu.org/licenses/>.
- /** @file tr1/special_function_util.h
- * This is an internal header file, included by other library headers.
- * Do not attempt to use it directly. @headername{tr1/cmath}
- */
- //
- // ISO C++ 14882 TR1: 5.2 Special functions
- //
- // Written by Edward Smith-Rowland based on numerous mathematics books.
- #ifndef _GLIBCXX_TR1_SPECIAL_FUNCTION_UTIL_H
- #define _GLIBCXX_TR1_SPECIAL_FUNCTION_UTIL_H 1
- namespace std _GLIBCXX_VISIBILITY(default)
- {
- _GLIBCXX_BEGIN_NAMESPACE_VERSION
- #if _GLIBCXX_USE_STD_SPEC_FUNCS
- #elif defined(_GLIBCXX_TR1_CMATH)
- namespace tr1
- {
- #else
- # error do not include this header directly, use <cmath> or <tr1/cmath>
- #endif
- namespace __detail
- {
- /// A class to encapsulate type dependent floating point
- /// constants. Not everything will be able to be expressed as
- /// type logic.
- template<typename _Tp>
- struct __floating_point_constant
- {
- static const _Tp __value;
- };
- /// A structure for numeric constants.
- template<typename _Tp>
- struct __numeric_constants
- {
- /// Constant @f$ \pi @f$.
- static _Tp __pi() throw()
- { return static_cast<_Tp>(3.1415926535897932384626433832795029L); }
- /// Constant @f$ \pi / 2 @f$.
- static _Tp __pi_2() throw()
- { return static_cast<_Tp>(1.5707963267948966192313216916397514L); }
- /// Constant @f$ \pi / 3 @f$.
- static _Tp __pi_3() throw()
- { return static_cast<_Tp>(1.0471975511965977461542144610931676L); }
- /// Constant @f$ \pi / 4 @f$.
- static _Tp __pi_4() throw()
- { return static_cast<_Tp>(0.7853981633974483096156608458198757L); }
- /// Constant @f$ 1 / \pi @f$.
- static _Tp __1_pi() throw()
- { return static_cast<_Tp>(0.3183098861837906715377675267450287L); }
- /// Constant @f$ 2 / \sqrt(\pi) @f$.
- static _Tp __2_sqrtpi() throw()
- { return static_cast<_Tp>(1.1283791670955125738961589031215452L); }
- /// Constant @f$ \sqrt(2) @f$.
- static _Tp __sqrt2() throw()
- { return static_cast<_Tp>(1.4142135623730950488016887242096981L); }
- /// Constant @f$ \sqrt(3) @f$.
- static _Tp __sqrt3() throw()
- { return static_cast<_Tp>(1.7320508075688772935274463415058723L); }
- /// Constant @f$ \sqrt(\pi/2) @f$.
- static _Tp __sqrtpio2() throw()
- { return static_cast<_Tp>(1.2533141373155002512078826424055226L); }
- /// Constant @f$ 1 / sqrt(2) @f$.
- static _Tp __sqrt1_2() throw()
- { return static_cast<_Tp>(0.7071067811865475244008443621048490L); }
- /// Constant @f$ \log(\pi) @f$.
- static _Tp __lnpi() throw()
- { return static_cast<_Tp>(1.1447298858494001741434273513530587L); }
- /// Constant Euler's constant @f$ \gamma_E @f$.
- static _Tp __gamma_e() throw()
- { return static_cast<_Tp>(0.5772156649015328606065120900824024L); }
- /// Constant Euler-Mascheroni @f$ e @f$
- static _Tp __euler() throw()
- { return static_cast<_Tp>(2.7182818284590452353602874713526625L); }
- };
- #if _GLIBCXX_USE_C99_MATH && !_GLIBCXX_USE_C99_FP_MACROS_DYNAMIC
- /// This is a wrapper for the isnan function. Otherwise, for NaN,
- /// all comparisons result in false. If/when we build a std::isnan
- /// out of intrinsics, this will disappear completely in favor of
- /// std::isnan.
- template<typename _Tp>
- inline bool __isnan(_Tp __x)
- { return std::isnan(__x); }
- #else
- template<typename _Tp>
- inline bool __isnan(const _Tp __x)
- { return __builtin_isnan(__x); }
- template<>
- inline bool __isnan<float>(float __x)
- { return __builtin_isnanf(__x); }
- template<>
- inline bool __isnan<long double>(long double __x)
- { return __builtin_isnanl(__x); }
- #endif
- } // namespace __detail
- #if ! _GLIBCXX_USE_STD_SPEC_FUNCS && defined(_GLIBCXX_TR1_CMATH)
- } // namespace tr1
- #endif
- _GLIBCXX_END_NAMESPACE_VERSION
- }
- #endif // _GLIBCXX_TR1_SPECIAL_FUNCTION_UTIL_H
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