82 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// constexpr auto size() requires sized_range<V>;12// constexpr auto size() const requires sized_range<const V>;13 14#include <ranges>15 16#include <cassert>17#include <utility>18 19#include "test_macros.h"20#include "types.h"21 22// end - begin = 8, but size may return something else.23template<CopyCategory CC>24struct BidirSizedRange : std::ranges::view_base {25 int *ptr_;26 std::size_t size_;27 28 constexpr BidirSizedRange(int *ptr, std::size_t size) : ptr_(ptr), size_(size) {}29 constexpr BidirSizedRange(const BidirSizedRange &) requires (CC == Copyable) = default;30 constexpr BidirSizedRange(BidirSizedRange &&) requires (CC == MoveOnly) = default;31 constexpr BidirSizedRange& operator=(const BidirSizedRange &) requires (CC == Copyable) = default;32 constexpr BidirSizedRange& operator=(BidirSizedRange &&) requires (CC == MoveOnly) = default;33 34 constexpr bidirectional_iterator<int*> begin() { return bidirectional_iterator<int*>{ptr_}; }35 constexpr bidirectional_iterator<const int*> begin() const { return bidirectional_iterator<const int*>{ptr_}; }36 constexpr bidirectional_iterator<int*> end() { return bidirectional_iterator<int*>{ptr_ + 8}; }37 constexpr bidirectional_iterator<const int*> end() const { return bidirectional_iterator<const int*>{ptr_ + 8}; }38 39 constexpr std::size_t size() const { return size_; }40};41 42constexpr bool test() {43 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};44 45 // Non-common, non-const bidirectional range.46 {47 auto rev = std::ranges::reverse_view(BidirSizedRange<Copyable>{buffer, 4});48 assert(std::ranges::size(rev) == 4);49 assert(rev.size() == 4);50 assert(std::move(rev).size() == 4);51 52 ASSERT_SAME_TYPE(decltype(rev.size()), std::size_t);53 ASSERT_SAME_TYPE(decltype(std::move(rev).size()), std::size_t);54 }55 // Non-common, const bidirectional range.56 {57 const auto rev = std::ranges::reverse_view(BidirSizedRange<Copyable>{buffer, 4});58 assert(std::ranges::size(rev) == 4);59 assert(rev.size() == 4);60 assert(std::move(rev).size() == 4);61 62 ASSERT_SAME_TYPE(decltype(rev.size()), std::size_t);63 ASSERT_SAME_TYPE(decltype(std::move(rev).size()), std::size_t);64 }65 // Non-common, non-const (move only) bidirectional range.66 {67 auto rev = std::ranges::reverse_view(BidirSizedRange<MoveOnly>{buffer, 4});68 assert(std::move(rev).size() == 4);69 70 ASSERT_SAME_TYPE(decltype(std::move(rev).size()), std::size_t);71 }72 73 return true;74}75 76int main(int, char**) {77 test();78 static_assert(test());79 80 return 0;81}82