libcxx/test/std/algorithms/alg.modifying.operations/alg.partitions/partition_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 <class InputIterator, class OutputIterator1,
  12 //           class OutputIterator2, class Predicate>
  13 //     constexpr pair<OutputIterator1, OutputIterator2>     // constexpr after C++17
  14 //     partition_copy(InputIterator first, InputIterator last,
  15 //                    OutputIterator1 out_true, OutputIterator2 out_false,
  16 //                    Predicate pred);
  17
  18 #include <algorithm>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22 #include "test_iterators.h"
  23
  24 struct is_odd
  25 {
  26     TEST_CONSTEXPR bool operator()(const int& i) const {return i & 1;}
  27 };
  28
  29 #if TEST_STD_VER > 17
  30 TEST_CONSTEXPR bool test_constexpr() {
  31     int ia[] = {1, 3, 5, 2, 4, 6};
  32     int r1[10] = {0};
  33     int r2[10] = {0};
  34
  35     auto p = std::partition_copy(std::begin(ia), std::end(ia),
  36                     std::begin(r1), std::begin(r2), is_odd());
  37
  38     return std::all_of(std::begin(r1), p.first, is_odd())
  39         && std::all_of(p.first, std::end(r1), [](int a){return a == 0;})
  40         && std::none_of(std::begin(r2), p.second, is_odd())
  41         && std::all_of(p.second, std::end(r2), [](int a){return a == 0;})
  42            ;
  43     }
  44 #endif
  45
  46 int main(int, char**)
  47 {
  48     {
  49         const int ia[] = {1, 2, 3, 4, 6, 8, 5, 7};
  50         int r1[10] = {0};
  51         int r2[10] = {0};
  52         typedef std::pair<cpp17_output_iterator<int*>,  int*> P;
  53         P p = std::partition_copy(cpp17_input_iterator<const int*>(std::begin(ia)),
  54                                   cpp17_input_iterator<const int*>(std::end(ia)),
  55                                   cpp17_output_iterator<int*>(r1), r2, is_odd());
  56         assert(base(p.first) == r1 + 4);
  57         assert(r1[0] == 1);
  58         assert(r1[1] == 3);
  59         assert(r1[2] == 5);
  60         assert(r1[3] == 7);
  61         assert(p.second == r2 + 4);
  62         assert(r2[0] == 2);
  63         assert(r2[1] == 4);
  64         assert(r2[2] == 6);
  65         assert(r2[3] == 8);
  66     }
  67
  68 #if TEST_STD_VER > 17
  69     static_assert(test_constexpr());
  70 #endif
  71
  72   return 0;
  73 }