0a4aa8a122
Reviewed By: ldionne, #libc, #libc_abi Spies: #libc_vendors, smeenai, libcxx-commits Differential Revision: https://reviews.llvm.org/D145320
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// constexpr explicit iota_view(W value);
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#include <cassert>
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#include <ranges>
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#include <type_traits>
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#include "test_macros.h"
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#include "types.h"
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struct SomeIntComparable {
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using difference_type = int;
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SomeInt value_;
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constexpr SomeIntComparable() : value_(SomeInt(10)) {}
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friend constexpr bool operator==(SomeIntComparable lhs, SomeIntComparable rhs) {
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return lhs.value_ == rhs.value_;
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}
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friend constexpr bool operator==(SomeIntComparable lhs, SomeInt rhs) {
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return lhs.value_ == rhs;
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}
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friend constexpr bool operator==(SomeInt lhs, SomeIntComparable rhs) {
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return lhs == rhs.value_;
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}
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friend constexpr difference_type operator-(SomeIntComparable lhs, SomeIntComparable rhs) {
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return lhs.value_ - rhs.value_;
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}
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constexpr SomeIntComparable& operator++() { ++value_; return *this; }
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constexpr SomeIntComparable operator++(int) { auto tmp = *this; ++value_; return tmp; }
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constexpr SomeIntComparable operator--() { --value_; return *this; }
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};
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constexpr bool test() {
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{
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std::ranges::iota_view<SomeInt> io(SomeInt(42));
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assert((*io.begin()).value_ == 42);
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// Check that end returns std::unreachable_sentinel.
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assert(io.end() != io.begin());
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static_assert(std::same_as<decltype(io.end()), std::unreachable_sentinel_t>);
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}
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{
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std::ranges::iota_view<SomeInt, SomeIntComparable> io(SomeInt(0));
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assert(std::ranges::next(io.begin(), 10) == io.end());
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}
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{
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static_assert(!std::is_convertible_v<std::ranges::iota_view<SomeInt>, SomeInt>);
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static_assert( std::is_constructible_v<std::ranges::iota_view<SomeInt>, SomeInt>);
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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