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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, c++20
// ADDITIONAL_COMPILE_FLAGS(has-fconstexpr-steps): -fconstexpr-steps=2000000
// template<forward_iterator I1, sentinel_for<I1> S1,
// forward_iterator I2, sentinel_for<I2> S2, class Proj = identity>
// requires indirectly_comparable<I1, I2, Pred, Proj1, Proj2>
// constexpr bool ranges::contains_subrange(I1 first1, S1 last1, I2 first2, S2 last2,
// Pred pred = {}, Proj1 proj1 = {}, Proj2 proj2 = {}); // since C++23
// template<forward_range R1, forward_range R2,
// class Pred = ranges::equal_to, class Proj1 = identity, class Proj2 = identity>
// requires indirectly_comparable<iterator_t<R1>, iterator_t<R2>, Pred, Proj1, Proj2>
// constexpr bool ranges::contains_subrange(R1&& r1, R2&& r2, Pred pred = {},
// Proj1 proj1 = {}, Proj2 proj2 = {}); // since C++23
#include <algorithm>
#include <array>
#include <cassert>
#include <concepts>
#include <ranges>
#include <utility>
#include "almost_satisfies_types.h"
#include "test_iterators.h"
struct NotEqualityComparable {};
template <class Iter1, class Sent1 = Iter1, class Iter2 = int*, class Sent2 = Iter2>
concept HasContainsSubrangeIt = requires(Iter1 first1, Sent1 last1, Iter2 first2, Sent2 last2) {
std::ranges::contains_subrange(first1, last1, first2, last2);
};
static_assert(HasContainsSubrangeIt<int*>);
static_assert(!HasContainsSubrangeIt<ForwardIteratorNotDerivedFrom>);
static_assert(!HasContainsSubrangeIt<ForwardIteratorNotIncrementable>);
static_assert(!HasContainsSubrangeIt<int*, SentinelForNotSemiregular>);
static_assert(!HasContainsSubrangeIt<int*, int*, int**>); // not indirectly comparable
static_assert(!HasContainsSubrangeIt<int*, SentinelForNotWeaklyEqualityComparableWith>);
static_assert(!HasContainsSubrangeIt<int*, int*, ForwardIteratorNotDerivedFrom>);
static_assert(!HasContainsSubrangeIt<int*, int*, ForwardIteratorNotIncrementable>);
static_assert(!HasContainsSubrangeIt<int*, int*, int*, SentinelForNotSemiregular>);
static_assert(!HasContainsSubrangeIt<int*, int*, int*, SentinelForNotWeaklyEqualityComparableWith>);
template <class Range1, class Range2 = UncheckedRange<int*>>
concept HasContainsSubrangeR = requires(Range1&& range1, Range2&& range2) {
std::ranges::contains_subrange(std::forward<Range1>(range1), std::forward<Range2>(range2));
};
static_assert(HasContainsSubrangeR<UncheckedRange<int*>>);
static_assert(!HasContainsSubrangeR<ForwardRangeNotDerivedFrom>);
static_assert(!HasContainsSubrangeR<ForwardIteratorNotIncrementable>);
static_assert(!HasContainsSubrangeR<ForwardRangeNotSentinelSemiregular>);
static_assert(!HasContainsSubrangeR<ForwardRangeNotSentinelEqualityComparableWith>);
static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, UncheckedRange<int**>>); // not indirectly comparable
static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotDerivedFrom>);
static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotIncrementable>);
static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotSentinelSemiregular>);
static_assert(!HasContainsSubrangeR<UncheckedRange<int*>, ForwardRangeNotSentinelEqualityComparableWith>);
template <class Iter1, class Sent1 = Iter1, class Iter2, class Sent2 = Iter2>
constexpr void test_iterators() {
{ // simple tests
int a[] = {1, 2, 3, 4, 5, 6};
int p[] = {3, 4, 5};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
std::same_as<bool> decltype(auto) ret =
std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(ret);
}
{
std::same_as<bool> decltype(auto) ret = std::ranges::contains_subrange(whole, subrange);
assert(ret);
}
}
{ // no match
int a[] = {1, 2, 3, 4, 5, 6};
int p[] = {3, 4, 2};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(!ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(!ret);
}
}
{ // range consists of just one element
int a[] = {3};
int p[] = {3, 4, 2};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(!ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(!ret);
}
}
{ // subrange consists of just one element
int a[] = {23, 1, 20, 3, 54, 2};
int p[] = {3};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(ret);
}
}
{ // range has zero length
std::array<int, 0> a = {};
int p[] = {3, 4, 2};
auto whole = std::ranges::subrange(Iter1(a.data()), Sent1(Iter1(a.data())));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(!ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(!ret);
}
}
{ // subrange has zero length
int a[] = {3, 4, 2};
std::array<int, 0> p = {};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p.data()), Sent2(Iter2(p.data())));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(ret);
}
}
{ // range and subrange both have zero length
std::array<int, 0> a = {};
std::array<int, 0> p = {};
auto whole = std::ranges::subrange(Iter1(a.data()), Sent1(Iter1(a.data())));
auto subrange = std::ranges::subrange(Iter2(p.data()), Sent2(Iter2(p.data())));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(ret);
}
}
{ // range and subrange are identical
int a[] = {3, 4, 11, 32, 54, 2};
int p[] = {3, 4, 11, 32, 54, 2};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(ret);
}
}
{ // subrange is longer than range
int a[] = {3, 4, 2};
int p[] = {23, 3, 4, 2, 11, 32, 54, 2};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(!ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(!ret);
}
}
{ // subrange is the prefix
int a[] = {3, 43, 5, 100, 433, 278, 6457, 900};
int p[] = {3, 43, 5};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(ret);
}
}
{ // subrange is the suffix
int a[] = {3, 43, 5, 7, 68, 100, 433, 900};
int p[] = {100, 433, 900};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(ret);
}
}
{ // subrange is a subsequence
int a[] = {23, 1, 0, 54, 2};
int p[] = {1, 0, 2};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(!ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(!ret);
}
}
{ // repeated subrange
int a[] = {23, 1, 0, 2, 54, 1, 0, 2, 23, 33};
int p[] = {1, 0, 2};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end());
assert(ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange);
assert(ret);
}
}
{ // check that the predicate is used
int a[] = {23, 81, 61, 0, 42, 25, 1, 2, 1, 29, 2};
int p[] = {-1, -2, -1};
auto pred = [](int l, int r) { return l * -1 == r; };
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
{
bool ret = std::ranges::contains_subrange(whole.begin(), whole.end(), subrange.begin(), subrange.end(), pred);
assert(ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange, pred);
assert(ret);
}
}
{ // check that the projections are used
int a[] = {1, 3, 15, 1, 2, 1, 8};
int p[] = {2, 1, 2};
auto whole = std::ranges::subrange(Iter1(a), Sent1(Iter1(std::end(a))));
auto subrange = std::ranges::subrange(Iter2(p), Sent2(Iter2(std::end(p))));
auto proj1 = [](int i) { return i - 3; };
auto proj2 = [](int i) { return i * -1; };
{
bool ret = std::ranges::contains_subrange(
whole.begin(), whole.end(), subrange.begin(), subrange.end(), {}, proj1, proj2);
assert(ret);
}
{
bool ret = std::ranges::contains_subrange(whole, subrange, {}, proj1, proj2);
assert(ret);
}
}
}
constexpr bool test() {
types::for_each(types::forward_iterator_list<int*>{}, []<class Iter1> {
types::for_each(types::forward_iterator_list<int*>{}, []<class Iter2> {
test_iterators<Iter1, Iter1, Iter2, Iter2>();
test_iterators<Iter1, Iter1, Iter2, sized_sentinel<Iter2>>();
test_iterators<Iter1, sized_sentinel<Iter1>, Iter2, Iter2>();
test_iterators<Iter1, sized_sentinel<Iter1>, Iter2, sized_sentinel<Iter2>>();
});
});
assert(std::ranges::contains_subrange(
std::views::iota(0, 5), std::views::iota(0, 5) | std::views::filter([](int) { return true; })));
assert(!std::ranges::contains_subrange(std::views::iota(0ULL, 42ULL), std::views::iota(0ULL, 1ULL << 32)));
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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