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The C and C++ Include Header Files

/usr/include/c++/11/experimental/random


$ cat -n /usr/include/c++/11/experimental/random

     1	// <experimental/random> -*- C++ -*-
     2	
     3	// Copyright (C) 2015-2021 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 experimental/random
    26	 *  This is a TS C++ Library header.
    27	 *  @ingroup libfund-ts
    28	 */
    29	
    30	#ifndef _GLIBCXX_EXPERIMENTAL_RANDOM
    31	#define _GLIBCXX_EXPERIMENTAL_RANDOM 1
    32	
    33	#if __cplusplus >= 201402L
    34	#include <random>
    35	#include <experimental/bits/lfts_config.h>
    36	
    37	namespace std {
    38	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    39	
    40	namespace experimental {
    41	inline namespace fundamentals_v2 {
    42	#define __cpp_lib_experimental_randint 201511
    43	
    44	  inline std::default_random_engine&
    45	  _S_randint_engine()
    46	  {
    47	    static thread_local default_random_engine __eng{random_device{}()};
    48	    return __eng;
    49	  }
    50	
    51	  // 13.2.2.1, Function template randint
    52	  template<typename _IntType>
    53	    inline _IntType
    54	    randint(_IntType __a, _IntType __b)
    55	    {
    56	      static_assert(is_integral<_IntType>::value && sizeof(_IntType) > 1,
    57			    "argument must be an integer type");
    58	      using _Dist = std::uniform_int_distribution<_IntType>;
    59	      // This relies on the fact our uniform_int_distribution is stateless,
    60	      // otherwise we'd need a static thread_local _Dist and pass it
    61	      // _Dist::param_type{__a, __b}.
    62	      return _Dist(__a, __b)(_S_randint_engine());
    63	    }
    64	
    65	  inline void
    66	  reseed()
    67	  {
    68	    _S_randint_engine().seed(random_device{}());
    69	  }
    70	
    71	  inline void
    72	  reseed(default_random_engine::result_type __value)
    73	  {
    74	    _S_randint_engine().seed(__value);
    75	  }
    76	} // namespace fundamentals_v2
    77	} // namespace experimental
    78	
    79	_GLIBCXX_END_NAMESPACE_VERSION
    80	} // namespace std
    81	
    82	#endif // C++14
    83	#endif // _GLIBCXX_EXPERIMENTAL_RANDOM