libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/replace_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, typename OutIter, class T>
  12 //   requires OutputIterator<OutIter, InIter::reference>
  13 //         && OutputIterator<OutIter, const T&>
  14 //         && HasEqualTo<InIter::value_type, T>
  15 //   constexpr OutIter      // constexpr after C++17
  16 //   replace_copy(InIter first, InIter last, OutIter result, const T& old_value,
  17 //                                                           const T& new_value);
  18
  19 #include <algorithm>
  20 #include <cassert>
  21
  22 #include "test_macros.h"
  23 #include "test_iterators.h"
  24
  25
  26 #if TEST_STD_VER > 17
  27 TEST_CONSTEXPR bool test_constexpr() {
  28     int ia[] = {0, 1, 2, 3, 4};
  29     int ib[] = {0, 0, 0, 0, 0, 0}; // one bigger
  30     const int expected[] = {0, 1, 5, 3, 4};
  31
  32     auto it = std::replace_copy(std::begin(ia), std::end(ia), std::begin(ib), 2, 5);
  33
  34     return it == (std::begin(ib) + std::size(ia))
  35         && *it == 0 // don't overwrite the last value in the output array
  36         && std::equal(std::begin(ib), it, std::begin(expected), std::end(expected))
  37         ;
  38     }
  39 #endif
  40
  41 template <class InIter, class OutIter>
  42 void
  43 test()
  44 {
  45     int ia[] = {0, 1, 2, 3, 4};
  46     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  47     int ib[sa] = {0};
  48     OutIter r = std::replace_copy(InIter(ia), InIter(ia+sa), OutIter(ib), 2, 5);
  49     assert(base(r) == ib + sa);
  50     assert(ib[0] == 0);
  51     assert(ib[1] == 1);
  52     assert(ib[2] == 5);
  53     assert(ib[3] == 3);
  54     assert(ib[4] == 4);
  55 }
  56
  57 int main(int, char**)
  58 {
  59     test<input_iterator<const int*>, output_iterator<int*> >();
  60     test<input_iterator<const int*>, forward_iterator<int*> >();
  61     test<input_iterator<const int*>, bidirectional_iterator<int*> >();
  62     test<input_iterator<const int*>, random_access_iterator<int*> >();
  63     test<input_iterator<const int*>, int*>();
  64
  65     test<forward_iterator<const int*>, output_iterator<int*> >();
  66     test<forward_iterator<const int*>, forward_iterator<int*> >();
  67     test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
  68     test<forward_iterator<const int*>, random_access_iterator<int*> >();
  69     test<forward_iterator<const int*>, int*>();
  70
  71     test<bidirectional_iterator<const int*>, output_iterator<int*> >();
  72     test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
  73     test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
  74     test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
  75     test<bidirectional_iterator<const int*>, int*>();
  76
  77     test<random_access_iterator<const int*>, output_iterator<int*> >();
  78     test<random_access_iterator<const int*>, forward_iterator<int*> >();
  79     test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
  80     test<random_access_iterator<const int*>, random_access_iterator<int*> >();
  81     test<random_access_iterator<const int*>, int*>();
  82
  83     test<const int*, output_iterator<int*> >();
  84     test<const int*, forward_iterator<int*> >();
  85     test<const int*, bidirectional_iterator<int*> >();
  86     test<const int*, random_access_iterator<int*> >();
  87     test<const int*, int*>();
  88
  89 #if TEST_STD_VER > 17
  90     static_assert(test_constexpr());
  91 #endif
  92
  93   return 0;
  94 }