libcxx/test/std/algorithms/alg.modifying.operations/alg.replace/replace_copy_if.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,
  12 //          Predicate<auto, InIter::value_type> Pred, class T>
  13 //   requires OutputIterator<OutIter, InIter::reference>
  14 //         && OutputIterator<OutIter, const T&>
  15 //         && CopyConstructible<Pred>
  16 //   constexpr OutIter      // constexpr after C++17
  17 //   replace_copy_if(InIter first, InIter last, OutIter result, Pred pred, const T& new_value);
  18
  19 #include <algorithm>
  20 #include <functional>
  21 #include <cassert>
  22
  23 #include "test_macros.h"
  24 #include "test_iterators.h"
  25
  26 TEST_CONSTEXPR bool equalToTwo(int v) { return v == 2; }
  27
  28
  29 #if TEST_STD_VER > 17
  30 TEST_CONSTEXPR bool test_constexpr() {
  31     int ia[] = {0, 1, 2, 3, 4};
  32     int ib[] = {0, 0, 0, 0, 0, 0}; // one bigger
  33     const int expected[] = {0, 1, 5, 3, 4};
  34
  35     auto it = std::replace_copy_if(std::begin(ia), std::end(ia), std::begin(ib), equalToTwo, 5);
  36
  37     return it == (std::begin(ib) + std::size(ia))
  38         && *it == 0 // don't overwrite the last value in the output array
  39         && std::equal(std::begin(ib), it, std::begin(expected), std::end(expected))
  40         ;
  41     }
  42 #endif
  43
  44 template <class InIter, class OutIter>
  45 void
  46 test()
  47 {
  48     int ia[] = {0, 1, 2, 3, 4};
  49     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  50     int ib[sa] = {0};
  51     OutIter r = std::replace_copy_if(InIter(ia), InIter(ia+sa),
  52                                      OutIter(ib), equalToTwo, 5);
  53     assert(base(r) == ib + sa);
  54     assert(ib[0] == 0);
  55     assert(ib[1] == 1);
  56     assert(ib[2] == 5);
  57     assert(ib[3] == 3);
  58     assert(ib[4] == 4);
  59 }
  60
  61 int main(int, char**)
  62 {
  63     test<input_iterator<const int*>, output_iterator<int*> >();
  64     test<input_iterator<const int*>, forward_iterator<int*> >();
  65     test<input_iterator<const int*>, bidirectional_iterator<int*> >();
  66     test<input_iterator<const int*>, random_access_iterator<int*> >();
  67     test<input_iterator<const int*>, int*>();
  68
  69     test<forward_iterator<const int*>, output_iterator<int*> >();
  70     test<forward_iterator<const int*>, forward_iterator<int*> >();
  71     test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
  72     test<forward_iterator<const int*>, random_access_iterator<int*> >();
  73     test<forward_iterator<const int*>, int*>();
  74
  75     test<bidirectional_iterator<const int*>, output_iterator<int*> >();
  76     test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
  77     test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
  78     test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
  79     test<bidirectional_iterator<const int*>, int*>();
  80
  81     test<random_access_iterator<const int*>, output_iterator<int*> >();
  82     test<random_access_iterator<const int*>, forward_iterator<int*> >();
  83     test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
  84     test<random_access_iterator<const int*>, random_access_iterator<int*> >();
  85     test<random_access_iterator<const int*>, int*>();
  86
  87     test<const int*, output_iterator<int*> >();
  88     test<const int*, forward_iterator<int*> >();
  89     test<const int*, bidirectional_iterator<int*> >();
  90     test<const int*, random_access_iterator<int*> >();
  91     test<const int*, int*>();
  92
  93 #if TEST_STD_VER > 17
  94     static_assert(test_constexpr());
  95 #endif
  96
  97   return 0;
  98 }