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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
// 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 <vector>
#include <cstdio>
#include "test_iterators.h"
#include "type_algorithms.h"
template <class Iter1, class Iter2>
TEST_CONSTEXPR_CXX20 void test_iterators() {
using Expected = std::ranges::swap_ranges_result<Iter1, Iter2>;
{ // Basic test case: swapping three elements between two arrays
int a[3] = {1, 2, 3};
int b[3] = {4, 5, 6};
std::same_as<Expected> auto r =
std::ranges::swap_ranges(Iter1(a), sentinel_wrapper(Iter1(a + 3)), Iter2(b), sentinel_wrapper(Iter2(b + 3)));
assert(base(r.in1) == a + 3);
assert(base(r.in2) == b + 3);
assert(std::ranges::equal(a, std::array{4, 5, 6}));
assert(std::ranges::equal(b, std::array{1, 2, 3}));
}
{ // Large-scale test: swapping 100 elements between two different containers
const int N = 100;
std::array<int, N> a;
std::vector<int> b(N + 2, 42);
b.front() = 1;
b.back() = -1;
for (int i = 0; i < N; ++i)
a[i] = i * i + 1;
std::same_as<Expected> auto r = std::ranges::swap_ranges(
Iter1(a.data()),
sentinel_wrapper(Iter1(a.data() + N)),
Iter2(b.data() + 1),
sentinel_wrapper(Iter2(b.data() + b.size())));
assert(base(r.in1) == a.data() + N);
assert(base(r.in2) == b.data() + N + 1);
assert(b.front() == 1); // Ensure that the unswapped portion remains unchanged
assert(b.back() == -1);
for (int i = 0; i < N; ++i) {
assert(a[i] == 42);
assert(b[i + 1] == i * i + 1);
}
}
}
template <std::size_t N>
constexpr void test_vector_bool() {
{ // Test swap_ranges() with aligned bytes
std::vector<bool> f(N, false), t(N, true);
std::ranges::swap_ranges(f, t);
assert(std::all_of(f.begin(), f.end(), [](bool b) { return b; }));
assert(std::all_of(t.begin(), t.end(), [](bool b) { return !b; }));
}
{ // Test swap_ranges() with unaligned bytes
std::vector<bool> f(N, false), t(N + 8, true);
std::ranges::swap_ranges(f.begin(), f.end(), t.begin() + 4, t.end() - 4);
assert(std::all_of(f.begin(), f.end(), [](bool b) { return b; }));
assert(std::all_of(t.begin() + 4, t.end() - 4, [](bool b) { return !b; }));
}
}
constexpr bool test() {
{ // Validate swapping ranges directly
std::array r1 = {1, 2, 3};
std::array r2 = {4, 5, 6};
std::same_as<std::ranges::in_in_result<std::array<int, 3>::iterator, std::array<int, 3>::iterator>> 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}));
}
{ // Validate swapping ranges using iterator and sentinels
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(std::ranges::equal(i, std::array{4, 5, 6}));
assert(std::ranges::equal(j, std::array{1, 2, 3}));
}
{ // Validate swapping ranges of 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(std::ranges::equal(i, std::array{4, 2, 3}));
assert(std::ranges::equal(j, std::array{1}));
std::same_as<Expected> auto r2 = std::ranges::swap_ranges(i, j);
assert(r2.in1 == i + 1);
assert(r2.in2 == j + 1);
assert(std::ranges::equal(i, std::array{1, 2, 3}));
assert(std::ranges::equal(j, std::array{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(std::ranges::equal(i, std::array{4, 2, 3}));
assert(std::ranges::equal(j, std::array{1}));
std::same_as<Expected> auto r4 = std::ranges::swap_ranges(j, i);
assert(r4.in1 == j + 1);
assert(r4.in2 == i + 1);
assert(std::ranges::equal(i, std::array{1, 2, 3}));
assert(std::ranges::equal(j, std::array{4}));
}
{ // Validate swapping when one or both are borrowed input ranges (views)
{
int r1[] = {1, 2, 3};
int r2[] = {4, 5, 6};
std::ranges::swap_ranges(std::views::all(r1), r2);
assert(std::ranges::equal(r1, std::array{4, 5, 6}));
assert(std::ranges::equal(r2, std::array{1, 2, 3}));
}
{
int r1[] = {1, 2, 3};
int r2[] = {4, 5, 6};
std::ranges::swap_ranges(r1, std::views::all(r2));
assert(std::ranges::equal(r1, std::array{4, 5, 6}));
assert(std::ranges::equal(r2, std::array{1, 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(std::ranges::equal(r1, std::array{4, 5, 6}));
assert(std::ranges::equal(r2, std::array{1, 2, 3}));
}
}
{ // Validate swapping involving rvalue ranges
{
using Expected = std::ranges::swap_ranges_result<std::array<int, 3>::iterator, 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, std::array<int, 3>::iterator>;
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);
}
}
types::for_each(types::cpp20_input_iterator_list<int*>(), []<class Iter1>() {
types::for_each(types::cpp20_input_iterator_list<int*>(), []<class Iter2>() {
test_iterators<Iter1, Iter2>();
test_iterators<ProxyIterator<Iter1>, ProxyIterator<Iter2>>();
});
});
{ // Test vector<bool>::iterator optimization
test_vector_bool<8>();
test_vector_bool<19>();
test_vector_bool<32>();
test_vector_bool<49>();
test_vector_bool<64>();
test_vector_bool<199>();
test_vector_bool<256>();
}
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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