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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
// template<common_with<I> I2>
// friend constexpr bool operator==(
// const counted_iterator& x, const counted_iterator<I2>& y);
// friend constexpr bool operator==(
// const counted_iterator& x, default_sentinel_t);
#include <iterator>
#include "test_macros.h"
#include "test_iterators.h"
// This iterator is common_with forward_iterator but NOT comparable with it.
template <class It>
class CommonWithForwardIter
{
It it_;
public:
typedef std::input_iterator_tag iterator_category;
typedef typename std::iterator_traits<It>::value_type value_type;
typedef typename std::iterator_traits<It>::difference_type difference_type;
typedef It pointer;
typedef typename std::iterator_traits<It>::reference reference;
constexpr It base() const {return it_;}
CommonWithForwardIter() = default;
explicit constexpr CommonWithForwardIter(It it) : it_(it) {}
constexpr CommonWithForwardIter(const forward_iterator<It>& it) : it_(it.base()) {}
constexpr reference operator*() const {return *it_;}
constexpr CommonWithForwardIter& operator++() {++it_; return *this;}
constexpr CommonWithForwardIter operator++(int)
{CommonWithForwardIter tmp(*this); ++(*this); return tmp;}
};
struct InputOrOutputArchetype {
using difference_type = int;
int *ptr;
constexpr int operator*() { return *ptr; }
constexpr void operator++(int) { ++ptr; }
constexpr InputOrOutputArchetype& operator++() { ++ptr; return *this; }
};
constexpr bool test() {
int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
{
{
std::counted_iterator iter1(forward_iterator<int*>(buffer), 8);
std::counted_iterator iter2(CommonWithForwardIter<int*>(buffer), 8);
assert(iter1 == iter2);
assert(iter2 == iter1);
++iter1;
assert(iter1 != iter2);
assert(iter2 != iter1);
}
}
{
{
std::counted_iterator iter(cpp20_input_iterator<int*>(buffer), 8);
assert(iter != std::default_sentinel);
assert(std::default_sentinel == std::ranges::next(std::move(iter), 8));
}
{
std::counted_iterator iter(forward_iterator<int*>(buffer), 8);
assert(iter != std::default_sentinel);
assert(std::default_sentinel == std::ranges::next(iter, 8));
}
{
std::counted_iterator iter(random_access_iterator<int*>(buffer), 8);
assert(iter != std::default_sentinel);
assert(std::default_sentinel == std::ranges::next(iter, 8));
}
{
std::counted_iterator iter(InputOrOutputArchetype{buffer}, 8);
assert(iter != std::default_sentinel);
assert(std::default_sentinel == std::ranges::next(iter, 8));
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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