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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 counted_iterator operator+(iter_difference_t<I> n) const
// requires random_access_iterator<I>;
// friend constexpr counted_iterator operator+(
// iter_difference_t<I> n, const counted_iterator& x)
// requires random_access_iterator<I>;
// constexpr counted_iterator& operator+=(iter_difference_t<I> n)
// requires random_access_iterator<I>;
#include <iterator>
#include "test_macros.h"
#include "test_iterators.h"
template<class Iter>
concept PlusEnabled = requires(Iter& iter) {
iter + 1;
};
template<class Iter>
concept PlusEqEnabled = requires(Iter& iter) {
iter += 1;
};
constexpr bool test() {
int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
{
{
using Counted = std::counted_iterator<random_access_iterator<int*>>;
std::counted_iterator iter(random_access_iterator<int*>{buffer}, 8);
assert(iter + 2 == Counted(random_access_iterator<int*>{buffer + 2}, 6));
assert(iter + 0 == Counted(random_access_iterator<int*>{buffer}, 8));
ASSERT_SAME_TYPE(decltype(iter + 2), Counted);
}
{
using Counted = const std::counted_iterator<random_access_iterator<int*>>;
const std::counted_iterator iter(random_access_iterator<int*>{buffer}, 8);
assert(iter + 8 == Counted(random_access_iterator<int*>{buffer + 8}, 0));
assert(iter + 0 == Counted(random_access_iterator<int*>{buffer}, 8));
ASSERT_SAME_TYPE(decltype(iter + 2), std::remove_const_t<Counted>);
}
}
{
{
using Counted = std::counted_iterator<random_access_iterator<int*>>;
std::counted_iterator iter(random_access_iterator<int*>{buffer}, 8);
assert(2 + iter == Counted(random_access_iterator<int*>{buffer + 2}, 6));
assert(0 + iter == Counted(random_access_iterator<int*>{buffer}, 8));
ASSERT_SAME_TYPE(decltype(iter + 2), Counted);
}
{
using Counted = const std::counted_iterator<random_access_iterator<int*>>;
const std::counted_iterator iter(random_access_iterator<int*>{buffer}, 8);
assert(8 + iter == Counted(random_access_iterator<int*>{buffer + 8}, 0));
assert(0 + iter == Counted(random_access_iterator<int*>{buffer}, 8));
ASSERT_SAME_TYPE(decltype(iter + 2), std::remove_const_t<Counted>);
}
}
{
{
using Counted = std::counted_iterator<random_access_iterator<int*>>;
std::counted_iterator iter(random_access_iterator<int*>{buffer}, 8);
assert((iter += 2) == Counted(random_access_iterator<int*>{buffer + 2}, 6));
assert((iter += 0) == Counted(random_access_iterator<int*>{buffer + 2}, 6));
ASSERT_SAME_TYPE(decltype(iter += 2), Counted&);
}
{
using Counted = std::counted_iterator<contiguous_iterator<int*>>;
std::counted_iterator iter(contiguous_iterator<int*>{buffer}, 8);
assert((iter += 8) == Counted(contiguous_iterator<int*>{buffer + 8}, 0));
assert((iter += 0) == Counted(contiguous_iterator<int*>{buffer + 8}, 0));
ASSERT_SAME_TYPE(decltype(iter += 2), Counted&);
}
{
static_assert( PlusEnabled<std::counted_iterator<random_access_iterator<int*>>>);
static_assert(!PlusEnabled<std::counted_iterator<bidirectional_iterator<int*>>>);
static_assert( PlusEqEnabled< std::counted_iterator<random_access_iterator<int*>>>);
static_assert(!PlusEqEnabled<const std::counted_iterator<random_access_iterator<int*>>>);
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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