62 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 explicit reverse_view(V r);12 13#include <ranges>14 15#include <cassert>16#include <type_traits>17#include <utility>18 19#include "types.h"20 21constexpr bool test() {22 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};23 24 {25 BidirRange r{buffer, buffer + 8};26 std::ranges::reverse_view<BidirRange> rev(r);27 assert(rev.base().begin_ == buffer);28 assert(rev.base().end_ == buffer + 8);29 }30 {31 const BidirRange r{buffer, buffer + 8};32 const std::ranges::reverse_view<BidirRange> rev(r);33 assert(rev.base().begin_ == buffer);34 assert(rev.base().end_ == buffer + 8);35 }36 {37 std::ranges::reverse_view<BidirSentRange<MoveOnly>> rev(BidirSentRange<MoveOnly>{buffer, buffer + 8});38 auto moved = std::move(rev).base();39 assert(moved.begin_ == buffer);40 assert(moved.end_ == buffer + 8);41 }42 {43 const std::ranges::reverse_view<BidirSentRange<Copyable>> rev(BidirSentRange<Copyable>{buffer, buffer + 8});44 assert(rev.base().begin_ == buffer);45 assert(rev.base().end_ == buffer + 8);46 }47 {48 // Make sure this ctor is marked as "explicit".49 static_assert( std::is_constructible_v<std::ranges::reverse_view<BidirRange>, BidirRange>);50 static_assert(!std::is_convertible_v<std::ranges::reverse_view<BidirRange>, BidirRange>);51 }52 53 return true;54}55 56int main(int, char**) {57 test();58 static_assert(test());59 60 return 0;61}62