1// <experimental/algorithm> -*- C++ -*-
2
3// Copyright (C) 2014-2020 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/algorithm
26 *  This is a TS C++ Library header.
27 *  @ingroup libfund-ts
28 */
29
30#ifndef _GLIBCXX_EXPERIMENTAL_ALGORITHM
31#define _GLIBCXX_EXPERIMENTAL_ALGORITHM 1
32
33#pragma GCC system_header
34
35#if __cplusplus >= 201402L
36
37#include <algorithm>
38#include <experimental/bits/lfts_config.h>
39#include <experimental/random>
40
41namespace std _GLIBCXX_VISIBILITY(default)
42{
43_GLIBCXX_BEGIN_NAMESPACE_VERSION
44
45namespace experimental
46{
47inline namespace fundamentals_v2
48{
49  template<typename _ForwardIterator, typename _Searcher>
50    inline _ForwardIterator
51    search(_ForwardIterator __first, _ForwardIterator __last,
52	   const _Searcher& __searcher)
53    { return __searcher(__first, __last); }
54
55#define __cpp_lib_experimental_sample 201402
56
57  /// Take a random sample from a population.
58  template<typename _PopulationIterator, typename _SampleIterator,
59           typename _Distance, typename _UniformRandomNumberGenerator>
60    _SampleIterator
61    sample(_PopulationIterator __first, _PopulationIterator __last,
62	   _SampleIterator __out, _Distance __n,
63	   _UniformRandomNumberGenerator&& __g)
64    {
65      using __pop_cat = typename
66	std::iterator_traits<_PopulationIterator>::iterator_category;
67      using __samp_cat = typename
68	std::iterator_traits<_SampleIterator>::iterator_category;
69
70      static_assert(
71	  __or_<is_convertible<__pop_cat, forward_iterator_tag>,
72		is_convertible<__samp_cat, random_access_iterator_tag>>::value,
73	  "output range must use a RandomAccessIterator when input range"
74	  " does not meet the ForwardIterator requirements");
75
76      static_assert(is_integral<_Distance>::value,
77		    "sample size must be an integer type");
78
79      typename iterator_traits<_PopulationIterator>::difference_type __d = __n;
80      return _GLIBCXX_STD_A::
81	__sample(__first, __last, __pop_cat{}, __out, __samp_cat{}, __d,
82		 std::forward<_UniformRandomNumberGenerator>(__g));
83    }
84
85  template<typename _PopulationIterator, typename _SampleIterator,
86           typename _Distance>
87    inline _SampleIterator
88    sample(_PopulationIterator __first, _PopulationIterator __last,
89	   _SampleIterator __out, _Distance __n)
90    {
91      return experimental::sample(__first, __last, __out, __n,
92				  _S_randint_engine());
93    }
94
95  template<typename _RandomAccessIterator>
96    inline void
97    shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
98    { return std::shuffle(__first, __last, _S_randint_engine()); }
99
100} // namespace fundamentals_v2
101} // namespace experimental
102
103_GLIBCXX_END_NAMESPACE_VERSION
104} // namespace std
105
106#endif // C++14
107
108#endif // _GLIBCXX_EXPERIMENTAL_ALGORITHM
109