1 | // <experimental/random> -*- C++ -*-
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2 |
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3 | // Copyright (C) 2015-2021 Free Software Foundation, Inc.
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4 | //
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5 | // This file is part of the GNU ISO C++ Library. This library is free
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6 | // software; you can redistribute it and/or modify it under the
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7 | // terms of the GNU General Public License as published by the
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8 | // Free Software Foundation; either version 3, or (at your option)
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9 | // any later version.
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10 |
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11 | // This library is distributed in the hope that it will be useful,
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12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | // GNU General Public License for more details.
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15 |
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16 | // Under Section 7 of GPL version 3, you are granted additional
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17 | // permissions described in the GCC Runtime Library Exception, version
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18 | // 3.1, as published by the Free Software Foundation.
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19 |
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20 | // You should have received a copy of the GNU General Public License and
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21 | // a copy of the GCC Runtime Library Exception along with this program;
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22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 | // <http://www.gnu.org/licenses/>.
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24 |
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25 | /** @file experimental/random
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26 | * This is a TS C++ Library header.
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27 | * @ingroup libfund-ts
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28 | */
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29 |
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30 | #ifndef _GLIBCXX_EXPERIMENTAL_RANDOM
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31 | #define _GLIBCXX_EXPERIMENTAL_RANDOM 1
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32 |
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33 | #if __cplusplus >= 201402L
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34 | #include <random>
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35 | #include <experimental/bits/lfts_config.h>
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36 |
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37 | namespace std {
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38 | _GLIBCXX_BEGIN_NAMESPACE_VERSION
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39 |
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40 | namespace experimental {
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41 | inline namespace fundamentals_v2 {
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42 | #define __cpp_lib_experimental_randint 201511
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43 |
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44 | inline std::default_random_engine&
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45 | _S_randint_engine()
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46 | {
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47 | static thread_local default_random_engine __eng{random_device{}()};
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48 | return __eng;
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49 | }
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50 |
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51 | // 13.2.2.1, Function template randint
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52 | template<typename _IntType>
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53 | inline _IntType
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54 | randint(_IntType __a, _IntType __b)
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55 | {
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56 | static_assert(is_integral<_IntType>::value && sizeof(_IntType) > 1,
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57 | "argument must be an integer type");
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58 | using _Dist = std::uniform_int_distribution<_IntType>;
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59 | // This relies on the fact our uniform_int_distribution is stateless,
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60 | // otherwise we'd need a static thread_local _Dist and pass it
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61 | // _Dist::param_type{__a, __b}.
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62 | return _Dist(__a, __b)(_S_randint_engine());
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63 | }
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64 |
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65 | inline void
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66 | reseed()
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67 | {
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68 | _S_randint_engine().seed(random_device{}());
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69 | }
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70 |
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71 | inline void
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72 | reseed(default_random_engine::result_type __value)
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73 | {
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74 | _S_randint_engine().seed(__value);
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75 | }
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76 | } // namespace fundamentals_v2
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77 | } // namespace experimental
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78 |
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79 | _GLIBCXX_END_NAMESPACE_VERSION
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80 | } // namespace std
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81 |
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82 | #endif // C++14
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83 | #endif // _GLIBCXX_EXPERIMENTAL_RANDOM
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