1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <algorithm>
11
12// template<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
13//   constexpr OutIter   // constexpr after C++17
14//   copy_n(InIter first, InIter::difference_type n, OutIter result);
15
16#include <algorithm>
17#include <cassert>
18
19#include "test_macros.h"
20#include "test_iterators.h"
21#include "user_defined_integral.hpp"
22
23// #if TEST_STD_VER > 17
24// TEST_CONSTEXPR bool test_constexpr() {
25//     int ia[] = {1, 2, 3, 4, 5};
26//     int ic[] = {6, 6, 6, 6, 6, 6, 6};
27//
28// 	auto p = std::copy_n(std::begin(ia), 4, std::begin(ic));
29// 	return std::equal(std::begin(ic), p, std::begin(ia))
30// 	    && std::all_of(p, std::end(ic), [](int a){return a == 6;})
31// 	    ;
32//     }
33// #endif
34
35typedef UserDefinedIntegral<unsigned> UDI;
36
37template <class InIter, class OutIter>
38void
39test()
40{
41    const unsigned N = 1000;
42    int ia[N];
43    for (unsigned i = 0; i < N; ++i)
44        ia[i] = i;
45    int ib[N] = {0};
46
47    OutIter r = std::copy_n(InIter(ia), UDI(N/2), OutIter(ib));
48    assert(base(r) == ib+N/2);
49    for (unsigned i = 0; i < N/2; ++i)
50        assert(ia[i] == ib[i]);
51}
52
53int main()
54{
55    test<input_iterator<const int*>, output_iterator<int*> >();
56    test<input_iterator<const int*>, input_iterator<int*> >();
57    test<input_iterator<const int*>, forward_iterator<int*> >();
58    test<input_iterator<const int*>, bidirectional_iterator<int*> >();
59    test<input_iterator<const int*>, random_access_iterator<int*> >();
60    test<input_iterator<const int*>, int*>();
61
62    test<forward_iterator<const int*>, output_iterator<int*> >();
63    test<forward_iterator<const int*>, input_iterator<int*> >();
64    test<forward_iterator<const int*>, forward_iterator<int*> >();
65    test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
66    test<forward_iterator<const int*>, random_access_iterator<int*> >();
67    test<forward_iterator<const int*>, int*>();
68
69    test<bidirectional_iterator<const int*>, output_iterator<int*> >();
70    test<bidirectional_iterator<const int*>, input_iterator<int*> >();
71    test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
72    test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
73    test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
74    test<bidirectional_iterator<const int*>, int*>();
75
76    test<random_access_iterator<const int*>, output_iterator<int*> >();
77    test<random_access_iterator<const int*>, input_iterator<int*> >();
78    test<random_access_iterator<const int*>, forward_iterator<int*> >();
79    test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
80    test<random_access_iterator<const int*>, random_access_iterator<int*> >();
81    test<random_access_iterator<const int*>, int*>();
82
83    test<const int*, output_iterator<int*> >();
84    test<const int*, input_iterator<int*> >();
85    test<const int*, forward_iterator<int*> >();
86    test<const int*, bidirectional_iterator<int*> >();
87    test<const int*, random_access_iterator<int*> >();
88    test<const int*, int*>();
89
90// #if TEST_STD_VER > 17
91//     static_assert(test_constexpr());
92// #endif
93}
94