110 lines · 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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 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 22template <class InContainer, class OutContainer>23constexpr 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 47template <class Iter, class Sent>48constexpr 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 -> contiguous54 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 -> contiguous63 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 -> segmented72 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 -> segmented81 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 93constexpr 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 100int 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}110