libcxx/test/std/algorithms/alg.modifying.operations/alg.remove/remove_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, OutputIterator<auto, InIter::reference> OutIter,
  12 //          Predicate<auto, InIter::value_type> Pred>
  13 //   requires CopyConstructible<Pred>
  14 //   constexpr OutIter         // constexpr after C++17
  15 //   remove_copy_if(InIter first, InIter last, OutIter result, Pred pred);
  16
  17 #include <algorithm>
  18 #include <functional>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22 #include "test_iterators.h"
  23
  24 TEST_CONSTEXPR bool equalToTwo(int v) { return v == 2; }
  25
  26 #if TEST_STD_VER > 17
  27 TEST_CONSTEXPR bool test_constexpr() {
  28     int ia[] = {1, 3, 5, 2, 5, 6};
  29     int ib[std::size(ia)] = {0};
  30
  31     auto it = std::remove_copy_if(std::begin(ia), std::end(ia), std::begin(ib), equalToTwo);
  32
  33     return std::distance(std::begin(ib), it) == static_cast<int>(std::size(ia) - 1)   // we removed one element
  34         && std::none_of(std::begin(ib), it, equalToTwo)
  35         && std::all_of (it, std::end(ib), [](int a) {return a == 0;})
  36            ;
  37     }
  38 #endif
  39
  40 template <class InIter, class OutIter>
  41 void
  42 test()
  43 {
  44     int ia[] = {0, 1, 2, 3, 4, 2, 3, 4, 2};
  45     const unsigned sa = sizeof(ia)/sizeof(ia[0]);
  46     int ib[sa];
  47     OutIter r = std::remove_copy_if(InIter(ia), InIter(ia+sa),
  48                                     OutIter(ib), equalToTwo);
  49     assert(base(r) == ib + sa-3);
  50     assert(ib[0] == 0);
  51     assert(ib[1] == 1);
  52     assert(ib[2] == 3);
  53     assert(ib[3] == 4);
  54     assert(ib[4] == 3);
  55     assert(ib[5] == 4);
  56 }
  57
  58 int main(int, char**)
  59 {
  60     test<input_iterator<const int*>, output_iterator<int*> >();
  61     test<input_iterator<const int*>, forward_iterator<int*> >();
  62     test<input_iterator<const int*>, bidirectional_iterator<int*> >();
  63     test<input_iterator<const int*>, random_access_iterator<int*> >();
  64     test<input_iterator<const int*>, int*>();
  65
  66     test<forward_iterator<const int*>, output_iterator<int*> >();
  67     test<forward_iterator<const int*>, forward_iterator<int*> >();
  68     test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
  69     test<forward_iterator<const int*>, random_access_iterator<int*> >();
  70     test<forward_iterator<const int*>, int*>();
  71
  72     test<bidirectional_iterator<const int*>, output_iterator<int*> >();
  73     test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
  74     test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
  75     test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
  76     test<bidirectional_iterator<const int*>, int*>();
  77
  78     test<random_access_iterator<const int*>, output_iterator<int*> >();
  79     test<random_access_iterator<const int*>, forward_iterator<int*> >();
  80     test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
  81     test<random_access_iterator<const int*>, random_access_iterator<int*> >();
  82     test<random_access_iterator<const int*>, int*>();
  83
  84     test<const int*, output_iterator<int*> >();
  85     test<const int*, forward_iterator<int*> >();
  86     test<const int*, bidirectional_iterator<int*> >();
  87     test<const int*, random_access_iterator<int*> >();
  88     test<const int*, int*>();
  89
  90 #if TEST_STD_VER > 17
  91     static_assert(test_constexpr());
  92 #endif
  93
  94   return 0;
  95 }