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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
// class std::ranges::subrange;
#include <ranges>
#include <cassert>
#include <iterator>
#include "test_iterators.h"
#include "type_algorithms.h"
template <class Iterator, class Sentinel>
constexpr bool test() {
using Subrange = std::ranges::subrange<Iterator, Sentinel>;
// Empty subrange
{
int array[10] = {};
Subrange rng(Iterator(std::begin(array)), Sentinel(Iterator(std::begin(array))));
std::same_as<Iterator> decltype(auto) beg = rng.begin();
std::same_as<Sentinel> decltype(auto) end = rng.end();
assert(beg == Iterator(std::begin(array)));
assert(end == Iterator(std::begin(array)));
}
// Non-empty subrange
{
int array[10] = {};
Subrange rng(Iterator(std::begin(array)), Sentinel(Iterator(std::end(array) - 3)));
std::same_as<Iterator> decltype(auto) beg = rng.begin();
std::same_as<Sentinel> decltype(auto) end = rng.end();
assert(beg == Iterator(std::begin(array)));
assert(end == Iterator(std::end(array) - 3));
}
return true;
}
int main(int, char**) {
types::for_each(types::forward_iterator_list<int*>{}, []<class Iterator> {
test<Iterator, sentinel_wrapper<Iterator>>();
static_assert(test<Iterator, sentinel_wrapper<Iterator>>());
});
return 0;
}
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