72 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// sentinel() = default;12// constexpr explicit sentinel(sentinel_t<Base> end);13// constexpr sentinel(sentinel<!Const> s)14// requires Const && convertible_to<sentinel_t<V>, sentinel_t<Base>>;15 16#include <ranges>17#include <cassert>18 19#include "test_macros.h"20#include "test_iterators.h"21#include "../types.h"22 23constexpr bool test() {24 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};25 26 {27 // Test the default ctor.28 using TakeView = std::ranges::take_view<MoveOnlyView>;29 using Sentinel = std::ranges::sentinel_t<TakeView>;30 Sentinel s;31 TakeView tv = TakeView(MoveOnlyView(buffer), 4);32 assert(tv.begin() + 4 == s);33 }34 35 {36 // Test the conversion from "sentinel" to "sentinel-to-const".37 using TakeView = std::ranges::take_view<MoveOnlyView>;38 using Sentinel = std::ranges::sentinel_t<TakeView>;39 using ConstSentinel = std::ranges::sentinel_t<const TakeView>;40 static_assert(std::is_convertible_v<Sentinel, ConstSentinel>);41 TakeView tv = TakeView(MoveOnlyView(buffer), 4);42 Sentinel s = tv.end();43 ConstSentinel cs = s;44 cs = s; // test assignment also45 assert(tv.begin() + 4 == s);46 assert(tv.begin() + 4 == cs);47 assert(std::as_const(tv).begin() + 4 == s);48 assert(std::as_const(tv).begin() + 4 == cs);49 }50 51 {52 // Test the constructor from "base-sentinel" to "sentinel".53 using TakeView = std::ranges::take_view<MoveOnlyView>;54 using Sentinel = std::ranges::sentinel_t<TakeView>;55 sentinel_wrapper<int*> sw1 = MoveOnlyView(buffer).end();56 static_assert(std::is_constructible_v<Sentinel, sentinel_wrapper<int*>>);57 static_assert(!std::is_convertible_v<sentinel_wrapper<int*>, Sentinel>);58 auto s = Sentinel(sw1);59 std::same_as<sentinel_wrapper<int*>> auto sw2 = s.base();60 assert(base(sw2) == base(sw1));61 }62 63 return true;64}65 66int main(int, char**) {67 test();68 static_assert(test());69 70 return 0;71}72