libcxx/test/std/algorithms/alg.modifying.operations/alg.move/ranges.move_backward.segmented.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 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10
  11 #include <algorithm>
  12 #include <array>
  13 #include <cassert>
  14 #include <concepts>
  15 #include <deque>
  16 #include <ranges>
  17 #include <vector>
  18
  19 #include "test_iterators.h"
  20 #include "type_algorithms.h"
  21
  22 template <class InContainer, class OutContainer>
  23 constexpr void test_containers() {
  24   using InIter  = typename InContainer::iterator;
  25   using OutIter = typename OutContainer::iterator;
  26
  27   {
  28     InContainer in{1, 2, 3, 4};
  29     OutContainer out(4);
  30
  31     std::same_as<std::ranges::in_out_result<InIter, OutIter>> auto ret =
  32         std::ranges::move_backward(in.begin(), in.end(), out.end());
  33     assert(std::ranges::equal(in, out));
  34     assert(ret.in == in.end());
  35     assert(ret.out == out.begin());
  36   }
  37   {
  38     InContainer in{1, 2, 3, 4};
  39     OutContainer out(4);
  40     std::same_as<std::ranges::in_out_result<InIter, OutIter>> auto ret = std::ranges::move_backward(in, out.end());
  41     assert(std::ranges::equal(in, out));
  42     assert(ret.in == in.end());
  43     assert(ret.out == out.begin());
  44   }
  45 }
  46
  47 template <class Iter, class Sent>
  48 constexpr void test_join_view() {
  49   auto to_subranges = std::views::transform([](auto& vec) {
  50     return std::ranges::subrange(Iter(vec.data()), Sent(Iter(vec.data() + vec.size())));
  51   });
  52
  53   { // segmented -> contiguous
  54     std::vector<std::vector<int>> vectors = {};
  55     auto range                            = vectors | to_subranges;
  56     std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
  57     std::array<int, 0> arr;
  58
  59     std::ranges::move_backward(subrange_vector | std::views::join, arr.end());
  60     assert(std::ranges::equal(arr, std::array<int, 0>{}));
  61   }
  62   { // segmented -> contiguous
  63     std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
  64     auto range                            = vectors | to_subranges;
  65     std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
  66     std::array<int, 10> arr;
  67
  68     std::ranges::move_backward(subrange_vector | std::views::join, arr.end());
  69     assert(std::ranges::equal(arr, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
  70   }
  71   { // contiguous -> segmented
  72     std::vector<std::vector<int>> vectors = {{0, 0, 0, 0}, {0, 0}, {0, 0, 0, 0}, {}};
  73     auto range                            = vectors | to_subranges;
  74     std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range.begin(), range.end());
  75     std::array arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  76
  77     std::ranges::move_backward(arr, (subrange_vector | std::views::join).end());
  78     assert(std::ranges::equal(subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
  79   }
  80   { // segmented -> segmented
  81     std::vector<std::vector<int>> vectors = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10}, {}};
  82     auto range1                           = vectors | to_subranges;
  83     std::vector<std::ranges::subrange<Iter, Sent>> subrange_vector(range1.begin(), range1.end());
  84     std::vector<std::vector<int>> to_vectors = {{0, 0, 0, 0}, {0, 0, 0, 0}, {}, {0, 0}};
  85     auto range2                              = to_vectors | to_subranges;
  86     std::vector<std::ranges::subrange<Iter, Sent>> to_subrange_vector(range2.begin(), range2.end());
  87
  88     std::ranges::move_backward(subrange_vector | std::views::join, (to_subrange_vector | std::views::join).end());
  89     assert(std::ranges::equal(to_subrange_vector | std::views::join, std::array{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}));
  90   }
  91 }
  92
  93 constexpr bool test_constexpr() {
  94   test_containers<std::vector<int>, std::vector<int>>();
  95
  96   types::for_each(types::bidirectional_iterator_list<int*>{}, []<class Iter> { test_join_view<Iter, Iter>(); });
  97   return true;
  98 }
  99
 100 int main(int, char**) {
 101   test_containers<std::deque<int>, std::deque<int>>();
 102   test_containers<std::deque<int>, std::vector<int>>();
 103   test_containers<std::vector<int>, std::deque<int>>();
 104
 105   test_constexpr();
 106   static_assert(test_constexpr());
 107
 108   return 0;
 109 }