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The C and C++ Include Header Files

/usr/include/c++/13/ext/cmath


$ cat -n /usr/include/c++/13/ext/cmath

     1	// Math extensions -*- C++ -*-
     2	
     3	// Copyright (C) 2013-2023 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 ext/cmath
    26	 *  This file is a GNU extension to the Standard C++ Library.
    27	 */
    28	
    29	#ifndef _EXT_CMATH
    30	#define _EXT_CMATH 1
    31	
    32	#pragma GCC system_header
    33	
    34	#include <bits/requires_hosted.h> // GNU extensions are currently omitted
    35	
    36	#if __cplusplus < 201103L
    37	# include <bits/c++0x_warning.h>
    38	#else
    39	
    40	#include <cmath>
    41	#include <type_traits>
    42	
    43	namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
    44	{
    45	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    46	
    47	  // A class for math constants.
    48	  template<typename _RealType>
    49	    struct __math_constants
    50	    {
    51	      static_assert(std::is_floating_point<_RealType>::value,
    52			    "template argument not a floating point type");
    53	
    54	      // Constant @f$ \pi @f$.
    55	      static constexpr _RealType __pi = 3.1415926535897932384626433832795029L;
    56	      // Constant @f$ \pi / 2 @f$.
    57	      static constexpr _RealType __pi_half = 1.5707963267948966192313216916397514L;
    58	      // Constant @f$ \pi / 3 @f$.
    59	      static constexpr _RealType __pi_third = 1.0471975511965977461542144610931676L;
    60	      // Constant @f$ \pi / 4 @f$.
    61	      static constexpr _RealType __pi_quarter = 0.7853981633974483096156608458198757L;
    62	      // Constant @f$ \sqrt(\pi / 2) @f$.
    63	      static constexpr _RealType __root_pi_div_2 = 1.2533141373155002512078826424055226L;
    64	      // Constant @f$ 1 / \pi @f$.
    65	      static constexpr _RealType __one_div_pi = 0.3183098861837906715377675267450287L;
    66	      // Constant @f$ 2 / \pi @f$.
    67	      static constexpr _RealType __two_div_pi = 0.6366197723675813430755350534900574L;
    68	      // Constant @f$ 2 / \sqrt(\pi) @f$.
    69	      static constexpr _RealType __two_div_root_pi = 1.1283791670955125738961589031215452L;
    70	
    71	      // Constant Euler's number @f$ e @f$.
    72	      static constexpr _RealType __e = 2.7182818284590452353602874713526625L;
    73	      // Constant @f$ 1 / e @f$.
    74	      static constexpr _RealType __one_div_e = 0.36787944117144232159552377016146087L;
    75	      // Constant @f$ \log_2(e) @f$.
    76	      static constexpr _RealType __log2_e = 1.4426950408889634073599246810018921L;
    77	      // Constant @f$ \log_10(e) @f$.
    78	      static constexpr _RealType __log10_e = 0.4342944819032518276511289189166051L;
    79	      // Constant @f$ \ln(2) @f$.
    80	      static constexpr _RealType __ln_2 = 0.6931471805599453094172321214581766L;
    81	      // Constant @f$ \ln(3) @f$.
    82	      static constexpr _RealType __ln_3 = 1.0986122886681096913952452369225257L;
    83	      // Constant @f$ \ln(10) @f$.
    84	      static constexpr _RealType __ln_10 = 2.3025850929940456840179914546843642L;
    85	
    86	      // Constant Euler-Mascheroni @f$ \gamma_E @f$.
    87	      static constexpr _RealType __gamma_e = 0.5772156649015328606065120900824024L;
    88	      // Constant Golden Ratio @f$ \phi @f$.
    89	      static constexpr _RealType __phi = 1.6180339887498948482045868343656381L;
    90	
    91	      // Constant @f$ \sqrt(2) @f$.
    92	      static constexpr _RealType __root_2 = 1.4142135623730950488016887242096981L;
    93	      // Constant @f$ \sqrt(3) @f$.
    94	      static constexpr _RealType __root_3 = 1.7320508075688772935274463415058724L;
    95	      // Constant @f$ \sqrt(5) @f$.
    96	      static constexpr _RealType __root_5 = 2.2360679774997896964091736687312762L;
    97	      // Constant @f$ \sqrt(7) @f$.
    98	      static constexpr _RealType __root_7 = 2.6457513110645905905016157536392604L;
    99	      // Constant @f$ 1 / \sqrt(2) @f$.
   100	      static constexpr _RealType __one_div_root_2 = 0.7071067811865475244008443621048490L;
   101	    };
   102	
   103	  // And the template definitions for the constants.
   104	  template<typename _RealType>
   105	    constexpr _RealType __math_constants<_RealType>::__pi;
   106	  template<typename _RealType>
   107	    constexpr _RealType __math_constants<_RealType>::__pi_half;
   108	  template<typename _RealType>
   109	    constexpr _RealType __math_constants<_RealType>::__pi_third;
   110	  template<typename _RealType>
   111	    constexpr _RealType __math_constants<_RealType>::__pi_quarter;
   112	  template<typename _RealType>
   113	    constexpr _RealType __math_constants<_RealType>::__root_pi_div_2;
   114	  template<typename _RealType>
   115	    constexpr _RealType __math_constants<_RealType>::__one_div_pi;
   116	  template<typename _RealType>
   117	    constexpr _RealType __math_constants<_RealType>::__two_div_pi;
   118	  template<typename _RealType>
   119	    constexpr _RealType __math_constants<_RealType>::__two_div_root_pi;
   120	  template<typename _RealType>
   121	    constexpr _RealType __math_constants<_RealType>::__e;
   122	  template<typename _RealType>
   123	    constexpr _RealType __math_constants<_RealType>::__one_div_e;
   124	  template<typename _RealType>
   125	    constexpr _RealType __math_constants<_RealType>::__log2_e;
   126	  template<typename _RealType>
   127	    constexpr _RealType __math_constants<_RealType>::__log10_e;
   128	  template<typename _RealType>
   129	    constexpr _RealType __math_constants<_RealType>::__ln_2;
   130	  template<typename _RealType>
   131	    constexpr _RealType __math_constants<_RealType>::__ln_3;
   132	  template<typename _RealType>
   133	    constexpr _RealType __math_constants<_RealType>::__ln_10;
   134	  template<typename _RealType>
   135	    constexpr _RealType __math_constants<_RealType>::__gamma_e;
   136	  template<typename _RealType>
   137	    constexpr _RealType __math_constants<_RealType>::__phi;
   138	  template<typename _RealType>
   139	    constexpr _RealType __math_constants<_RealType>::__root_2;
   140	  template<typename _RealType>
   141	    constexpr _RealType __math_constants<_RealType>::__root_3;
   142	  template<typename _RealType>
   143	    constexpr _RealType __math_constants<_RealType>::__root_5;
   144	  template<typename _RealType>
   145	    constexpr _RealType __math_constants<_RealType>::__root_7;
   146	  template<typename _RealType>
   147	    constexpr _RealType __math_constants<_RealType>::__one_div_root_2;
   148	
   149	_GLIBCXX_END_NAMESPACE_VERSION
   150	} // namespace __gnu_cxx
   151	
   152	#endif // C++11
   153	
   154	#endif // _EXT_CMATH