Imported gcc-4.4.3

[msp430-gcc.git] / libstdc++-v3 / include / tr1 / special_function_util.h

diff --git a/libstdc++-v3/include/tr1/special_function_util.h b/libstdc++-v3/include/tr1/special_function_util.h
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+// 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
+