1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <algorithm>
10
11 // template<InputIterator InIter, class OutIter,
12 // Callable<auto, const InIter::value_type&> Op>
13 // requires OutputIterator<OutIter, Op::result_type> && CopyConstructible<Op>
14 // constexpr OutIter // constexpr after C++17
15 // transform(InIter first, InIter last, OutIter result, Op op);
16
17 #include <algorithm>
18 #include <functional>
19 #include <cassert>
20
21 #include "test_macros.h"
22 #include "test_iterators.h"
23
plusOne(int v)24 TEST_CONSTEXPR int plusOne(int v) { return v + 1; }
25
26
27 #if TEST_STD_VER > 17
test_constexpr()28 TEST_CONSTEXPR bool test_constexpr() {
29 int ia[] = {1, 3, 6, 7};
30 int ib[] = {0, 0, 0, 0, 0}; // one bigger
31 const int expected[] = {2, 4, 7, 8};
32
33 auto it = std::transform(std::begin(ia), std::end(ia), std::begin(ib), plusOne);
34
35 return it == (std::begin(ib) + std::size(ia))
36 && *it == 0 // don't overwrite the last value in the output array
37 && std::equal(std::begin(ib), it, std::begin(expected), std::end(expected))
38 ;
39 }
40 #endif
41
42
43 template <class InIter, class OutIter>
44 void
test()45 test()
46 {
47 int ia[] = {0, 1, 2, 3, 4};
48 const unsigned sa = sizeof(ia)/sizeof(ia[0]);
49 int ib[sa] = {0};
50 OutIter r = std::transform(InIter(ia), InIter(ia+sa),
51 OutIter(ib), plusOne);
52 assert(base(r) == ib + sa);
53 assert(ib[0] == 1);
54 assert(ib[1] == 2);
55 assert(ib[2] == 3);
56 assert(ib[3] == 4);
57 assert(ib[4] == 5);
58 }
59
main(int,char **)60 int main(int, char**)
61 {
62 test<cpp17_input_iterator<const int*>, cpp17_output_iterator<int*> >();
63 test<cpp17_input_iterator<const int*>, cpp17_input_iterator<int*> >();
64 test<cpp17_input_iterator<const int*>, forward_iterator<int*> >();
65 test<cpp17_input_iterator<const int*>, bidirectional_iterator<int*> >();
66 test<cpp17_input_iterator<const int*>, random_access_iterator<int*> >();
67 test<cpp17_input_iterator<const int*>, int*>();
68
69 test<forward_iterator<const int*>, cpp17_output_iterator<int*> >();
70 test<forward_iterator<const int*>, cpp17_input_iterator<int*> >();
71 test<forward_iterator<const int*>, forward_iterator<int*> >();
72 test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
73 test<forward_iterator<const int*>, random_access_iterator<int*> >();
74 test<forward_iterator<const int*>, int*>();
75
76 test<bidirectional_iterator<const int*>, cpp17_output_iterator<int*> >();
77 test<bidirectional_iterator<const int*>, cpp17_input_iterator<int*> >();
78 test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
79 test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
80 test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
81 test<bidirectional_iterator<const int*>, int*>();
82
83 test<random_access_iterator<const int*>, cpp17_output_iterator<int*> >();
84 test<random_access_iterator<const int*>, cpp17_input_iterator<int*> >();
85 test<random_access_iterator<const int*>, forward_iterator<int*> >();
86 test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
87 test<random_access_iterator<const int*>, random_access_iterator<int*> >();
88 test<random_access_iterator<const int*>, int*>();
89
90 test<const int*, cpp17_output_iterator<int*> >();
91 test<const int*, cpp17_input_iterator<int*> >();
92 test<const int*, forward_iterator<int*> >();
93 test<const int*, bidirectional_iterator<int*> >();
94 test<const int*, random_access_iterator<int*> >();
95 test<const int*, int*>();
96
97 #if TEST_STD_VER > 17
98 static_assert(test_constexpr());
99 #endif
100
101 return 0;
102 }
103