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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
//
//===----------------------------------------------------------------------===//
// <algorithm>
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// template<input_iterator I1, sentinel_for<I1> S1, input_iterator I2, sentinel_for<I2> S2>
// requires indirectly_swappable<I1, I2>
// constexpr ranges::swap_ranges_result<I1, I2>
// ranges::swap_ranges(I1 first1, S1 last1, I2 first2, S2 last2);
// template<input_range R1, input_range R2>
// requires indirectly_swappable<iterator_t<R1>, iterator_t<R2>>
// constexpr ranges::swap_ranges_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>>
// ranges::swap_ranges(R1&& r1, R2&& r2);
#include <algorithm>
#include <array>
#include <cassert>
#include <ranges>
#include "test_iterators.h"
constexpr void test_different_lengths() {
using Expected = std::ranges::swap_ranges_result<int*, int*>;
int i[3] = {1, 2, 3};
int j[1] = {4};
std::same_as<Expected> auto r = std::ranges::swap_ranges(i, i + 3, j, j + 1);
assert(r.in1 == i + 1);
assert(r.in2 == j + 1);
assert(i[0] == 4);
assert(i[1] == 2);
assert(i[2] == 3);
assert(j[0] == 1);
std::same_as<Expected> auto r2 = std::ranges::swap_ranges(i, j);
assert(r2.in1 == i + 1);
assert(r2.in2 == j + 1);
assert(i[0] == 1);
assert(i[1] == 2);
assert(i[2] == 3);
assert(j[0] == 4);
std::same_as<Expected> auto r3 = std::ranges::swap_ranges(j, j + 1, i, i + 3);
assert(r3.in1 == j + 1);
assert(r3.in2 == i + 1);
assert(i[0] == 4);
assert(i[1] == 2);
assert(i[2] == 3);
assert(j[0] == 1);
std::same_as<Expected> auto r4 = std::ranges::swap_ranges(j, i);
assert(r4.in1 == j + 1);
assert(r4.in2 == i + 1);
assert(i[0] == 1);
assert(i[1] == 2);
assert(i[2] == 3);
assert(j[0] == 4);
}
constexpr void test_range() {
std::array r1 = {1, 2, 3};
std::array r2 = {4, 5, 6};
std::same_as<std::ranges::in_in_result<int*, int*>> auto r = std::ranges::swap_ranges(r1, r2);
assert(r.in1 == r1.end());
assert(r.in2 == r2.end());
assert((r1 == std::array{4, 5, 6}));
assert((r2 == std::array{1, 2, 3}));
}
constexpr void test_borrowed_input_range() {
{
int r1[] = {1, 2, 3};
int r2[] = {4, 5, 6};
std::ranges::swap_ranges(std::views::all(r1), r2);
assert(r1[0] == 4);
assert(r1[1] == 5);
assert(r1[2] == 6);
assert(r2[0] == 1);
assert(r2[1] == 2);
assert(r2[2] == 3);
}
{
int r1[] = {1, 2, 3};
int r2[] = {4, 5, 6};
std::ranges::swap_ranges(r1, std::views::all(r2));
assert(r1[0] == 4);
assert(r1[1] == 5);
assert(r1[2] == 6);
assert(r2[0] == 1);
assert(r2[1] == 2);
assert(r2[2] == 3);
}
{
int r1[] = {1, 2, 3};
int r2[] = {4, 5, 6};
std::ranges::swap_ranges(std::views::all(r1), std::views::all(r2));
assert(r1[0] == 4);
assert(r1[1] == 5);
assert(r1[2] == 6);
assert(r2[0] == 1);
assert(r2[1] == 2);
assert(r2[2] == 3);
}
}
constexpr void test_sentinel() {
int i[3] = {1, 2, 3};
int j[3] = {4, 5, 6};
using It = cpp17_input_iterator<int*>;
using Sent = sentinel_wrapper<It>;
using Expected = std::ranges::swap_ranges_result<It, It>;
std::same_as<Expected> auto r =
std::ranges::swap_ranges(It(i), Sent(It(i + 3)), It(j), Sent(It(j + 3)));
assert(base(r.in1) == i + 3);
assert(base(r.in2) == j + 3);
assert(i[0] == 4);
assert(i[1] == 5);
assert(i[2] == 6);
assert(j[0] == 1);
assert(j[1] == 2);
assert(j[2] == 3);
}
template <class Iter1, class Iter2>
constexpr void test_iterators() {
using Expected = std::ranges::swap_ranges_result<Iter1, Iter2>;
int i[3] = {1, 2, 3};
int j[3] = {4, 5, 6};
std::same_as<Expected> auto r =
std::ranges::swap_ranges(Iter1(i), sentinel_wrapper(Iter1(i + 3)), Iter2(j), sentinel_wrapper(Iter2(j + 3)));
assert(base(r.in1) == i + 3);
assert(base(r.in2) == j + 3);
assert(i[0] == 4);
assert(i[1] == 5);
assert(i[2] == 6);
assert(j[0] == 1);
assert(j[1] == 2);
assert(j[2] == 3);
}
constexpr void test_rval_range() {
{
using Expected = std::ranges::swap_ranges_result<int*, std::ranges::dangling>;
std::array<int, 3> r = {1, 2, 3};
std::same_as<Expected> auto a = std::ranges::swap_ranges(r, std::array{4, 5, 6});
assert((r == std::array{4, 5, 6}));
assert(a.in1 == r.begin() + 3);
}
{
std::array<int, 3> r = {1, 2, 3};
using Expected = std::ranges::swap_ranges_result<std::ranges::dangling, int*>;
std::same_as<Expected> auto b = std::ranges::swap_ranges(std::array{4, 5, 6}, r);
assert((r == std::array{4, 5, 6}));
assert(b.in2 == r.begin() + 3);
}
}
template <class Out>
constexpr void test_proxy_in_iterators() {
test_iterators<ProxyIterator<cpp20_input_iterator<int*>>, Out>();
test_iterators<ProxyIterator<forward_iterator<int*>>, Out>();
test_iterators<ProxyIterator<bidirectional_iterator<int*>>, Out>();
test_iterators<ProxyIterator<random_access_iterator<int*>>, Out>();
test_iterators<ProxyIterator<contiguous_iterator<int*>>, Out>();
}
constexpr bool test() {
test_range();
test_iterators<cpp20_input_iterator<int*>, cpp20_input_iterator<int*>>();
test_iterators<cpp20_input_iterator<int*>, forward_iterator<int*>>();
test_iterators<cpp20_input_iterator<int*>, bidirectional_iterator<int*>>();
test_iterators<cpp20_input_iterator<int*>, random_access_iterator<int*>>();
test_iterators<cpp20_input_iterator<int*>, int*>();
test_iterators<forward_iterator<int*>, cpp20_input_iterator<int*>>();
test_iterators<forward_iterator<int*>, forward_iterator<int*>>();
test_iterators<forward_iterator<int*>, bidirectional_iterator<int*>>();
test_iterators<forward_iterator<int*>, random_access_iterator<int*>>();
test_iterators<forward_iterator<int*>, int*>();
test_iterators<bidirectional_iterator<int*>, cpp20_input_iterator<int*>>();
test_iterators<bidirectional_iterator<int*>, forward_iterator<int*>>();
test_iterators<bidirectional_iterator<int*>, bidirectional_iterator<int*>>();
test_iterators<bidirectional_iterator<int*>, random_access_iterator<int*>>();
test_iterators<bidirectional_iterator<int*>, int*>();
test_iterators<random_access_iterator<int*>, cpp20_input_iterator<int*>>();
test_iterators<random_access_iterator<int*>, forward_iterator<int*>>();
test_iterators<random_access_iterator<int*>, bidirectional_iterator<int*>>();
test_iterators<random_access_iterator<int*>, random_access_iterator<int*>>();
test_iterators<random_access_iterator<int*>, int*>();
test_iterators<int*, cpp20_input_iterator<int*>>();
test_iterators<int*, forward_iterator<int*>>();
test_iterators<int*, bidirectional_iterator<int*>>();
test_iterators<int*, random_access_iterator<int*>>();
test_iterators<int*, int*>();
test_proxy_in_iterators<ProxyIterator<cpp20_input_iterator<int*>>>();
test_proxy_in_iterators<ProxyIterator<forward_iterator<int*>>>();
test_proxy_in_iterators<ProxyIterator<bidirectional_iterator<int*>>>();
test_proxy_in_iterators<ProxyIterator<random_access_iterator<int*>>>();
test_proxy_in_iterators<ProxyIterator<contiguous_iterator<int*>>>();
test_sentinel();
test_different_lengths();
test_borrowed_input_range();
test_rval_range();
return true;
}
static_assert(std::same_as<std::ranges::swap_ranges_result<int, char>, std::ranges::in_in_result<int, char>>);
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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