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Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/include/tr1/special_function_util.h')
| -rw-r--r-- | gcc-4.4.3/libstdc++-v3/include/tr1/special_function_util.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/include/tr1/special_function_util.h b/gcc-4.4.3/libstdc++-v3/include/tr1/special_function_util.h new file mode 100644 index 000000000..d2699bd85 --- /dev/null +++ b/gcc-4.4.3/libstdc++-v3/include/tr1/special_function_util.h @@ -0,0 +1,144 @@ +// Special functions -*- C++ -*- + +// Copyright (C) 2006, 2009 +// 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. + * You should not attempt to use it directly. + */ + +// +// 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 +{ +namespace tr1 +{ + + 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(const _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>(const float __x) + { + return __builtin_isnanf(__x); + } + + template<> + inline bool __isnan<long double>(const long double __x) + { + return __builtin_isnanl(__x); + } + +#endif + + } // namespace __detail + +} +} + +#endif // _GLIBCXX_TR1_SPECIAL_FUNCTION_UTIL_H + |