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 //          EquivalenceRelation<auto, InIter::value_type> Pred>
13 //   requires OutputIterator<OutIter, RvalueOf<InIter::value_type>::type>
14 //         && HasAssign<InIter::value_type, InIter::reference>
15 //         && Constructible<InIter::value_type, InIter::reference>
16 //         && CopyConstructible<Pred>
17 //   constexpr OutIter        // constexpr after C++17
18 //   unique_copy(InIter first, InIter last, OutIter result, Pred pred);
19 
20 #include <algorithm>
21 #include <cassert>
22 
23 #include "test_macros.h"
24 #include "test_iterators.h"
25 
26 #if TEST_STD_VER > 17
test_constexpr()27 TEST_CONSTEXPR bool test_constexpr() {
28           int ia[]       = {0, 1, 2, 2, 4};
29           int ib[]       = {0, 0, 0, 0, 0};
30     const int expected[] = {0, 1, 2, 4};
31 
32     auto it = std::unique_copy(std::begin(ia), std::end(ia), std::begin(ib),
33                          [](int a, int b) {return a == b; });
34     return it == (std::begin(ib) + std::size(expected))
35         && *it == 0 // don't overwrite final value in output
36         && std::equal(std::begin(ib), it, std::begin(expected), std::end(expected))
37         ;
38     }
39 #endif
40 
41 struct count_equal
42 {
43     static unsigned count;
44     template <class T>
operator ()count_equal45     bool operator()(const T& x, const T& y)
46         {++count; return x == y;}
47 };
48 
49 unsigned count_equal::count = 0;
50 
51 template <class InIter, class OutIter>
52 void
test()53 test()
54 {
55     const int ia[] = {0};
56     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
57     int ja[sa] = {-1};
58     count_equal::count = 0;
59     OutIter r = std::unique_copy(InIter(ia), InIter(ia+sa), OutIter(ja), count_equal());
60     assert(base(r) == ja + sa);
61     assert(ja[0] == 0);
62     assert(count_equal::count == sa-1);
63 
64     const int ib[] = {0, 1};
65     const unsigned sb = sizeof(ib)/sizeof(ib[0]);
66     int jb[sb] = {-1};
67     count_equal::count = 0;
68     r = std::unique_copy(InIter(ib), InIter(ib+sb), OutIter(jb), count_equal());
69     assert(base(r) == jb + sb);
70     assert(jb[0] == 0);
71     assert(jb[1] == 1);
72     assert(count_equal::count == sb-1);
73 
74     const int ic[] = {0, 0};
75     const unsigned sc = sizeof(ic)/sizeof(ic[0]);
76     int jc[sc] = {-1};
77     count_equal::count = 0;
78     r = std::unique_copy(InIter(ic), InIter(ic+sc), OutIter(jc), count_equal());
79     assert(base(r) == jc + 1);
80     assert(jc[0] == 0);
81     assert(count_equal::count == sc-1);
82 
83     const int id[] = {0, 0, 1};
84     const unsigned sd = sizeof(id)/sizeof(id[0]);
85     int jd[sd] = {-1};
86     count_equal::count = 0;
87     r = std::unique_copy(InIter(id), InIter(id+sd), OutIter(jd), count_equal());
88     assert(base(r) == jd + 2);
89     assert(jd[0] == 0);
90     assert(jd[1] == 1);
91     assert(count_equal::count == sd-1);
92 
93     const int ie[] = {0, 0, 1, 0};
94     const unsigned se = sizeof(ie)/sizeof(ie[0]);
95     int je[se] = {-1};
96     count_equal::count = 0;
97     r = std::unique_copy(InIter(ie), InIter(ie+se), OutIter(je), count_equal());
98     assert(base(r) == je + 3);
99     assert(je[0] == 0);
100     assert(je[1] == 1);
101     assert(je[2] == 0);
102     assert(count_equal::count == se-1);
103 
104     const int ig[] = {0, 0, 1, 1};
105     const unsigned sg = sizeof(ig)/sizeof(ig[0]);
106     int jg[sg] = {-1};
107     count_equal::count = 0;
108     r = std::unique_copy(InIter(ig), InIter(ig+sg), OutIter(jg), count_equal());
109     assert(base(r) == jg + 2);
110     assert(jg[0] == 0);
111     assert(jg[1] == 1);
112     assert(count_equal::count == sg-1);
113 
114     const int ih[] = {0, 1, 1};
115     const unsigned sh = sizeof(ih)/sizeof(ih[0]);
116     int jh[sh] = {-1};
117     count_equal::count = 0;
118     r = std::unique_copy(InIter(ih), InIter(ih+sh), OutIter(jh), count_equal());
119     assert(base(r) == jh + 2);
120     assert(jh[0] == 0);
121     assert(jh[1] == 1);
122     assert(count_equal::count == sh-1);
123 
124     const int ii[] = {0, 1, 1, 1, 2, 2, 2};
125     const unsigned si = sizeof(ii)/sizeof(ii[0]);
126     int ji[si] = {-1};
127     count_equal::count = 0;
128     r = std::unique_copy(InIter(ii), InIter(ii+si), OutIter(ji), count_equal());
129     assert(base(r) == ji + 3);
130     assert(ji[0] == 0);
131     assert(ji[1] == 1);
132     assert(ji[2] == 2);
133     assert(count_equal::count == si-1);
134 }
135 
main(int,char **)136 int main(int, char**)
137 {
138     test<cpp17_input_iterator<const int*>, cpp17_output_iterator<int*> >();
139     test<cpp17_input_iterator<const int*>, forward_iterator<int*> >();
140     test<cpp17_input_iterator<const int*>, bidirectional_iterator<int*> >();
141     test<cpp17_input_iterator<const int*>, random_access_iterator<int*> >();
142     test<cpp17_input_iterator<const int*>, int*>();
143 
144     test<forward_iterator<const int*>, cpp17_output_iterator<int*> >();
145     test<forward_iterator<const int*>, forward_iterator<int*> >();
146     test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
147     test<forward_iterator<const int*>, random_access_iterator<int*> >();
148     test<forward_iterator<const int*>, int*>();
149 
150     test<bidirectional_iterator<const int*>, cpp17_output_iterator<int*> >();
151     test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
152     test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
153     test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
154     test<bidirectional_iterator<const int*>, int*>();
155 
156     test<random_access_iterator<const int*>, cpp17_output_iterator<int*> >();
157     test<random_access_iterator<const int*>, forward_iterator<int*> >();
158     test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
159     test<random_access_iterator<const int*>, random_access_iterator<int*> >();
160     test<random_access_iterator<const int*>, int*>();
161 
162     test<const int*, cpp17_output_iterator<int*> >();
163     test<const int*, forward_iterator<int*> >();
164     test<const int*, bidirectional_iterator<int*> >();
165     test<const int*, random_access_iterator<int*> >();
166     test<const int*, int*>();
167 
168 #if TEST_STD_VER > 17
169     static_assert(test_constexpr());
170 #endif
171 
172   return 0;
173 }
174