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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
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: gcc-10
// template<indirectly_swappable<I> I2>
// friend constexpr void
// iter_swap(const counted_iterator& x, const counted_iterator<I2>& y)
// noexcept(noexcept(ranges::iter_swap(x.current, y.current)));
#include <iterator>
#include "test_macros.h"
#include "test_iterators.h"
template<bool IsNoexcept>
class HasNoexceptIterSwap
{
int *it_;
public:
typedef std::input_iterator_tag iterator_category;
typedef int value_type;
typedef typename std::iterator_traits<int *>::difference_type difference_type;
typedef int * pointer;
typedef int & reference;
constexpr int *base() const {return it_;}
HasNoexceptIterSwap() = default;
explicit constexpr HasNoexceptIterSwap(int *it) : it_(it) {}
constexpr reference operator*() const {return *it_;}
constexpr HasNoexceptIterSwap& operator++() {++it_; return *this;}
constexpr HasNoexceptIterSwap operator++(int)
{HasNoexceptIterSwap tmp(*this); ++(*this); return tmp;}
friend void iter_swap(
const HasNoexceptIterSwap&, const HasNoexceptIterSwap&) noexcept(IsNoexcept) {}
};
constexpr bool test() {
int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
{
auto iter1 = cpp17_input_iterator<int*>(buffer);
auto commonIter1 = std::counted_iterator<decltype(iter1)>(iter1, 8);
auto commonIter2 = std::counted_iterator<decltype(iter1)>(iter1, 8);
for (auto i = 0; i < 4; ++i) ++commonIter2;
assert(*commonIter2 == 5);
std::ranges::iter_swap(commonIter1, commonIter2);
assert(*commonIter1 == 5);
assert(*commonIter2 == 1);
std::ranges::iter_swap(commonIter2, commonIter1);
}
{
auto iter1 = forward_iterator<int*>(buffer);
auto commonIter1 = std::counted_iterator<decltype(iter1)>(iter1, 8);
auto commonIter2 = std::counted_iterator<decltype(iter1)>(iter1, 8);
for (auto i = 0; i < 4; ++i) ++commonIter2;
assert(*commonIter2 == 5);
std::ranges::iter_swap(commonIter1, commonIter2);
assert(*commonIter1 == 5);
assert(*commonIter2 == 1);
std::ranges::iter_swap(commonIter2, commonIter1);
}
{
auto iter1 = random_access_iterator<int*>(buffer);
auto commonIter1 = std::counted_iterator<decltype(iter1)>(iter1, 8);
auto commonIter2 = std::counted_iterator<decltype(iter1)>(iter1, 8);
for (auto i = 0; i < 4; ++i) ++commonIter2;
assert(*commonIter2 == 5);
std::ranges::iter_swap(commonIter1, commonIter2);
assert(*commonIter1 == 5);
assert(*commonIter2 == 1);
std::ranges::iter_swap(commonIter2, commonIter1);
}
// Test noexceptness.
{
static_assert( noexcept(std::ranges::iter_swap(
std::declval<std::counted_iterator<HasNoexceptIterSwap<true>>&>(),
std::declval<std::counted_iterator<HasNoexceptIterSwap<true>>&>()
)));
static_assert(!noexcept(std::ranges::iter_swap(
std::declval<std::counted_iterator<HasNoexceptIterSwap<false>>&>(),
std::declval<std::counted_iterator<HasNoexceptIterSwap<false>>&>()
)));
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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