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// constexpr explicit iota_view(W value);12 13#include <cassert>14#include <ranges>15#include <type_traits>16 17#include "test_macros.h"18#include "types.h"19 20struct SomeIntComparable {21 using difference_type = int;22 23 SomeInt value_;24 constexpr SomeIntComparable() : value_(SomeInt(10)) {}25 26 friend constexpr bool operator==(SomeIntComparable lhs, SomeIntComparable rhs) {27 return lhs.value_ == rhs.value_;28 }29 friend constexpr bool operator==(SomeIntComparable lhs, SomeInt rhs) {30 return lhs.value_ == rhs;31 }32 friend constexpr bool operator==(SomeInt lhs, SomeIntComparable rhs) {33 return lhs == rhs.value_;34 }35 36 friend constexpr difference_type operator-(SomeIntComparable lhs, SomeIntComparable rhs) {37 return lhs.value_ - rhs.value_;38 }39 40 constexpr SomeIntComparable& operator++() { ++value_; return *this; }41 constexpr SomeIntComparable operator++(int) { auto tmp = *this; ++value_; return tmp; }42 constexpr SomeIntComparable operator--() { --value_; return *this; }43};44 45constexpr bool test() {46 {47 std::ranges::iota_view<SomeInt> io(SomeInt(42));48 assert((*io.begin()).value_ == 42);49 // Check that end returns std::unreachable_sentinel.50 assert(io.end() != io.begin());51 static_assert(std::same_as<decltype(io.end()), std::unreachable_sentinel_t>);52 }53 54 {55 std::ranges::iota_view<SomeInt, SomeIntComparable> io(SomeInt(0));56 assert(std::ranges::next(io.begin(), 10) == io.end());57 }58 {59 static_assert(!std::is_convertible_v<std::ranges::iota_view<SomeInt>, SomeInt>);60 static_assert( std::is_constructible_v<std::ranges::iota_view<SomeInt>, SomeInt>);61 }62 63 return true;64}65 66int main(int, char**) {67 test();68 static_assert(test());69 70 return 0;71}72