68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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;
|
|
}
|