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//===----------------------------------------------------------------------===//
//
// 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 subrange() requires default_initializable<I>;
#include <ranges>
#include <cassert>
#include <cstddef>
#include "test_iterators.h"
// An input_or_output_iterator that is not default constructible so we can test
// the `requires` on subrange's default constructor.
struct NoDefaultIterator {
using difference_type = std::ptrdiff_t;
NoDefaultIterator() = delete;
NoDefaultIterator& operator++();
void operator++(int);
int& operator*() const;
friend bool operator==(NoDefaultIterator const&, NoDefaultIterator const&);
};
static_assert(std::input_or_output_iterator<NoDefaultIterator>);
// A sentinel type for the above iterator
struct Sentinel {
friend bool operator==(NoDefaultIterator const&, Sentinel const&);
friend bool operator==(Sentinel const&, NoDefaultIterator const&);
friend bool operator!=(NoDefaultIterator const&, Sentinel const&);
friend bool operator!=(Sentinel const&, NoDefaultIterator const&);
};
constexpr bool test() {
{
static_assert(!std::is_default_constructible_v<std::ranges::subrange<NoDefaultIterator, Sentinel, std::ranges::subrange_kind::sized>>);
static_assert(!std::is_default_constructible_v<std::ranges::subrange<NoDefaultIterator, Sentinel, std::ranges::subrange_kind::unsized>>);
}
{
using Iter = forward_iterator<int*>;
std::ranges::subrange<Iter, Iter, std::ranges::subrange_kind::sized> subrange;
assert(subrange.begin() == Iter());
assert(subrange.end() == Iter());
}
{
using Iter = forward_iterator<int*>;
std::ranges::subrange<Iter, Iter, std::ranges::subrange_kind::unsized> subrange;
assert(subrange.begin() == Iter());
assert(subrange.end() == Iter());
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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