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