libcxx/test/std/algorithms/alg.modifying.operations/alg.remove/remove_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, OutputIterator<auto, InIter::reference> OutIter, class T>
  12 //   requires HasEqualTo<InIter::value_type, T>
  13 //   constexpr OutIter         // constexpr after C++17
  14 //   remove_copy(InIter first, InIter last, OutIter result, const T& value);
  15
  16 #include <algorithm>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20 #include "test_iterators.h"
  21
  22 #if TEST_STD_VER > 17
  23 TEST_CONSTEXPR bool test_constexpr() {
  24     int ia[] = {1, 3, 5, 2, 5, 6};
  25     int ib[std::size(ia)] = {0};
  26
  27     auto it = std::remove_copy(std::begin(ia), std::end(ia), std::begin(ib), 5);
  28
  29     return std::distance(std::begin(ib), it) == static_cast<int>(std::size(ia) - 2)   // we removed two elements
  30         && std::none_of(std::begin(ib), it, [](int a) {return a == 5;})
  31         && std::all_of (it, std::end(ib),   [](int a) {return a == 0;})
  32            ;
  33     }
  34 #endif
  35
  36 template <class InIter, class OutIter>
  37 void
  38 test()
  39 {
  40     int ia[] = {0, 1, 2, 3, 4, 2, 3, 4, 2};
  41     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  42     int ib[sa];
  43     OutIter r = std::remove_copy(InIter(ia), InIter(ia+sa), OutIter(ib), 2);
  44     assert(base(r) == ib + sa-3);
  45     assert(ib[0] == 0);
  46     assert(ib[1] == 1);
  47     assert(ib[2] == 3);
  48     assert(ib[3] == 4);
  49     assert(ib[4] == 3);
  50     assert(ib[5] == 4);
  51 }
  52
  53 int main(int, char**)
  54 {
  55     test<input_iterator<const int*>, output_iterator<int*> >();
  56     test<input_iterator<const int*>, forward_iterator<int*> >();
  57     test<input_iterator<const int*>, bidirectional_iterator<int*> >();
  58     test<input_iterator<const int*>, random_access_iterator<int*> >();
  59     test<input_iterator<const int*>, int*>();
  60
  61     test<forward_iterator<const int*>, output_iterator<int*> >();
  62     test<forward_iterator<const int*>, forward_iterator<int*> >();
  63     test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
  64     test<forward_iterator<const int*>, random_access_iterator<int*> >();
  65     test<forward_iterator<const int*>, int*>();
  66
  67     test<bidirectional_iterator<const int*>, output_iterator<int*> >();
  68     test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
  69     test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
  70     test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
  71     test<bidirectional_iterator<const int*>, int*>();
  72
  73     test<random_access_iterator<const int*>, output_iterator<int*> >();
  74     test<random_access_iterator<const int*>, forward_iterator<int*> >();
  75     test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
  76     test<random_access_iterator<const int*>, random_access_iterator<int*> >();
  77     test<random_access_iterator<const int*>, int*>();
  78
  79     test<const int*, output_iterator<int*> >();
  80     test<const int*, forward_iterator<int*> >();
  81     test<const int*, bidirectional_iterator<int*> >();
  82     test<const int*, random_access_iterator<int*> >();
  83     test<const int*, int*>();
  84
  85 #if TEST_STD_VER > 17
  86     static_assert(test_constexpr());
  87 #endif
  88
  89   return 0;
  90 }