libcxx/test/std/iterators/predef.iterators/iterators.common/plus_plus.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 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 // common_iterator& operator++();
  12 // decltype(auto) operator++(int);
  13
  14 #include <iterator>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18 #include "types.h"
  19
  20 struct Incomplete;
  21
  22 void test() {
  23   // Reference: http://eel.is/c++draft/iterators.common#common.iter.nav-5
  24   // Case 2: can-reference
  25   {
  26     int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
  27     auto iter1 = simple_iterator<int*>(buffer);
  28     auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1);
  29     auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8});
  30
  31     assert(*(commonIter1++) == 1);
  32     assert(*commonIter1 == 2);
  33     assert(*(++commonIter1) == 3);
  34     assert(*commonIter1 == 3);
  35
  36     for (auto i = 3; commonIter1 != commonSent1; ++i) {
  37       assert(*(commonIter1++) == i);
  38     }
  39     assert(commonIter1 == commonSent1);
  40   }
  41
  42   // Case 2: can-reference
  43   {
  44     int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
  45     auto iter1 = value_iterator<int*>(buffer);
  46     auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1);
  47     auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8});
  48
  49     assert(*(commonIter1++) == 1);
  50     assert(*commonIter1 == 2);
  51     assert(*(++commonIter1) == 3);
  52     assert(*commonIter1 == 3);
  53
  54     for (auto i = 3; commonIter1 != commonSent1; ++i) {
  55       assert(*(commonIter1++) == i);
  56     }
  57     assert(commonIter1 == commonSent1);
  58   }
  59
  60   // Case 3: postfix-proxy
  61   {
  62     int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
  63     auto iter1 = void_plus_plus_iterator<int*>(buffer);
  64     auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1);
  65     auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8});
  66
  67     assert(*(commonIter1++) == 1);
  68     assert(*commonIter1 == 2);
  69     assert(*(++commonIter1) == 3);
  70     assert(*commonIter1 == 3);
  71
  72     for (auto i = 3; commonIter1 != commonSent1; ++i) {
  73       assert(*(commonIter1++) == i);
  74     }
  75     assert(commonIter1 == commonSent1);
  76   }
  77
  78   // Case 2: where this is not referencable or move constructible
  79   {
  80     int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
  81     auto iter1 = value_type_not_move_constructible_iterator<int*>(buffer);
  82     auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1);
  83     auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8});
  84
  85     commonIter1++;
  86     ASSERT_SAME_TYPE(decltype(commonIter1++), void);
  87     assert(*commonIter1 == 2);
  88     assert(*(++commonIter1) == 3);
  89     assert(*commonIter1 == 3);
  90
  91     for (auto i = 3; commonIter1 != commonSent1; ++i) {
  92       assert(*commonIter1 == i);
  93       commonIter1++;
  94     }
  95     assert(commonIter1 == commonSent1);
  96   }
  97
  98   // Case 2: can-reference
  99   {
 100     int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
 101     auto iter1 = cpp17_input_iterator<int*>(buffer);
 102     auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1);
 103     auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8});
 104
 105     assert(*(commonIter1++) == 1);
 106     assert(*commonIter1 == 2);
 107     assert(*(++commonIter1) == 3);
 108     assert(*commonIter1 == 3);
 109
 110     for (auto i = 3; commonIter1 != commonSent1; ++i) {
 111       assert(*(commonIter1++) == i);
 112     }
 113     assert(commonIter1 == commonSent1);
 114   }
 115
 116   // Case 1: forward_iterator
 117   {
 118     int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
 119     auto iter1 = forward_iterator<int*>(buffer);
 120     auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1);
 121     auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8});
 122
 123     assert(*(commonIter1++) == 1);
 124     assert(*commonIter1 == 2);
 125     assert(*(++commonIter1) == 3);
 126     assert(*commonIter1 == 3);
 127
 128     for (auto i = 3; commonIter1 != commonSent1; ++i) {
 129       assert(*(commonIter1++) == i);
 130     }
 131     assert(commonIter1 == commonSent1);
 132   }
 133
 134   // Case 1: forward_iterator
 135   {
 136     int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
 137     auto iter1 = random_access_iterator<int*>(buffer);
 138     auto commonIter1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(iter1);
 139     auto commonSent1 = std::common_iterator<decltype(iter1), sentinel_type<int*>>(sentinel_type<int*>{buffer + 8});
 140
 141     assert(*(commonIter1++) == 1);
 142     assert(*commonIter1 == 2);
 143     assert(*(++commonIter1) == 3);
 144     assert(*commonIter1 == 3);
 145
 146     for (auto i = 3; commonIter1 != commonSent1; ++i) {
 147       assert(*(commonIter1++) == i);
 148     }
 149     assert(commonIter1 == commonSent1);
 150   }
 151
 152   // Increment a common_iterator<cpp17_output_iterator>: iter_value_t is not always valid for
 153   // output iterators (it isn't for our test cpp17_output_iterator). This is worth testing
 154   // because it gets tricky when we define operator++(int).
 155   {
 156     int buffer[] = {0, 1, 2, 3, 4};
 157     using Common = std::common_iterator<cpp17_output_iterator<int*>, sentinel_type<int*>>;
 158     auto iter = Common(cpp17_output_iterator<int*>(buffer));
 159     auto sent = Common(sentinel_type<int*>{buffer + 5});
 160
 161     *iter++ = 90;
 162     assert(buffer[0] == 90);
 163
 164     *iter = 91;
 165     assert(buffer[1] == 91);
 166
 167     *++iter = 92;
 168     assert(buffer[2] == 92);
 169
 170     iter++;
 171     iter++;
 172     assert(iter != sent);
 173     iter++;
 174     assert(iter == sent);
 175   }
 176 }
 177
 178 int main(int, char**) {
 179   test();
 180
 181   return 0;
 182 }