libcxx/test/std/algorithms/alg.modifying.operations/alg.unique/unique_copy.pass.cpp

   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 //   requires OutputIterator<OutIter, RvalueOf<InIter::value_type>::type>
  13 //         && EqualityComparable<InIter::value_type>
  14 //         && HasAssign<InIter::value_type, InIter::reference>
  15 //         && Constructible<InIter::value_type, InIter::reference>
  16 //   constexpr OutIter        // constexpr after C++17
  17 //   unique_copy(InIter first, InIter last, OutIter result);
  18
  19 #include <algorithm>
  20 #include <cassert>
  21
  22 #include "MoveOnly.h"
  23 #include "test_macros.h"
  24 #include "test_iterators.h"
  25
  26 struct AssignableFromMoveOnly {
  27   AssignableFromMoveOnly(int i) : data(i) {}
  28   AssignableFromMoveOnly() : data(0) {}
  29   int data;
  30   AssignableFromMoveOnly& operator=(MoveOnly const& m) {
  31     data = m.get();
  32     return *this;
  33   }
  34   bool operator==(AssignableFromMoveOnly const& rhs) const { return data == rhs.data; }
  35 };
  36
  37 #if TEST_STD_VER > 17
  38 TEST_CONSTEXPR bool test_constexpr() {
  39           int ia[]       = {0, 1, 2, 2, 4};
  40           int ib[]       = {0, 0, 0, 0, 0};
  41     const int expected[] = {0, 1, 2, 4};
  42
  43     auto it = std::unique_copy(std::begin(ia), std::end(ia), std::begin(ib));
  44     return it == (std::begin(ib) + std::size(expected))
  45         && *it == 0 // don't overwrite final value in output
  46         && std::equal(std::begin(ib), it, std::begin(expected), std::end(expected))
  47         ;
  48     }
  49 #endif
  50
  51 template <class InIter, class OutIter>
  52 void
  53 test()
  54 {
  55     const int ia[] = {0};
  56     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  57     int ja[sa] = {-1};
  58     OutIter r = std::unique_copy(InIter(ia), InIter(ia+sa), OutIter(ja));
  59     assert(base(r) == ja + sa);
  60     assert(ja[0] == 0);
  61
  62     const int ib[] = {0, 1};
  63     const unsigned sb = sizeof(ib)/sizeof(ib[0]);
  64     int jb[sb] = {-1};
  65     r = std::unique_copy(InIter(ib), InIter(ib+sb), OutIter(jb));
  66     assert(base(r) == jb + sb);
  67     assert(jb[0] == 0);
  68     assert(jb[1] == 1);
  69
  70     const int ic[] = {0, 0};
  71     const unsigned sc = sizeof(ic)/sizeof(ic[0]);
  72     int jc[sc] = {-1};
  73     r = std::unique_copy(InIter(ic), InIter(ic+sc), OutIter(jc));
  74     assert(base(r) == jc + 1);
  75     assert(jc[0] == 0);
  76
  77     const int id[] = {0, 0, 1};
  78     const unsigned sd = sizeof(id)/sizeof(id[0]);
  79     int jd[sd] = {-1};
  80     r = std::unique_copy(InIter(id), InIter(id+sd), OutIter(jd));
  81     assert(base(r) == jd + 2);
  82     assert(jd[0] == 0);
  83     assert(jd[1] == 1);
  84
  85     const int ie[] = {0, 0, 1, 0};
  86     const unsigned se = sizeof(ie)/sizeof(ie[0]);
  87     int je[se] = {-1};
  88     r = std::unique_copy(InIter(ie), InIter(ie+se), OutIter(je));
  89     assert(base(r) == je + 3);
  90     assert(je[0] == 0);
  91     assert(je[1] == 1);
  92     assert(je[2] == 0);
  93
  94     const int ig[] = {0, 0, 1, 1};
  95     const unsigned sg = sizeof(ig)/sizeof(ig[0]);
  96     int jg[sg] = {-1};
  97     r = std::unique_copy(InIter(ig), InIter(ig+sg), OutIter(jg));
  98     assert(base(r) == jg + 2);
  99     assert(jg[0] == 0);
 100     assert(jg[1] == 1);
 101
 102     const int ih[] = {0, 1, 1};
 103     const unsigned sh = sizeof(ih)/sizeof(ih[0]);
 104     int jh[sh] = {-1};
 105     r = std::unique_copy(InIter(ih), InIter(ih+sh), OutIter(jh));
 106     assert(base(r) == jh + 2);
 107     assert(jh[0] == 0);
 108     assert(jh[1] == 1);
 109
 110     const int ii[] = {0, 1, 1, 1, 2, 2, 2};
 111     const unsigned si = sizeof(ii)/sizeof(ii[0]);
 112     int ji[si] = {-1};
 113     r = std::unique_copy(InIter(ii), InIter(ii+si), OutIter(ji));
 114     assert(base(r) == ji + 3);
 115     assert(ji[0] == 0);
 116     assert(ji[1] == 1);
 117     assert(ji[2] == 2);
 118 }
 119
 120 int main(int, char**)
 121 {
 122     test<cpp17_input_iterator<const int*>, cpp17_input_iterator<int*> >();
 123     test<cpp17_input_iterator<const int*>, cpp17_output_iterator<int*> >();
 124     test<cpp17_input_iterator<const int*>, forward_iterator<int*> >();
 125     test<cpp17_input_iterator<const int*>, bidirectional_iterator<int*> >();
 126     test<cpp17_input_iterator<const int*>, random_access_iterator<int*> >();
 127     test<cpp17_input_iterator<const int*>, int*>();
 128
 129     test<forward_iterator<const int*>, cpp17_output_iterator<int*> >();
 130     test<forward_iterator<const int*>, forward_iterator<int*> >();
 131     test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
 132     test<forward_iterator<const int*>, random_access_iterator<int*> >();
 133     test<forward_iterator<const int*>, int*>();
 134
 135     test<bidirectional_iterator<const int*>, cpp17_output_iterator<int*> >();
 136     test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
 137     test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
 138     test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
 139     test<bidirectional_iterator<const int*>, int*>();
 140
 141     test<random_access_iterator<const int*>, cpp17_output_iterator<int*> >();
 142     test<random_access_iterator<const int*>, forward_iterator<int*> >();
 143     test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
 144     test<random_access_iterator<const int*>, random_access_iterator<int*> >();
 145     test<random_access_iterator<const int*>, int*>();
 146
 147     test<const int*, cpp17_output_iterator<int*> >();
 148     test<const int*, forward_iterator<int*> >();
 149     test<const int*, bidirectional_iterator<int*> >();
 150     test<const int*, random_access_iterator<int*> >();
 151     test<const int*, int*>();
 152
 153     // Move only inputs
 154     {
 155       MoveOnly in[5]                     = {1, 3, 3, 3, 1};
 156       AssignableFromMoveOnly out[3]      = {};
 157       auto result                        = std::unique_copy(in, in + 5, out);
 158       AssignableFromMoveOnly expected[3] = {1, 3, 1};
 159       assert(std::equal(out, out + 3, expected));
 160       assert(result == out + 3);
 161     }
 162
 163 #if TEST_STD_VER > 17
 164     static_assert(test_constexpr());
 165 #endif
 166
 167   return 0;
 168 }