//===----------------------------------------------------------------------===//
//
// 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,
// class Pred = ranges::equal_to, class Proj1 = identity, class Proj2 = identity>
// requires indirectly_comparable<I1, I2, Pred, Proj1, Proj2>
// constexpr bool ranges::equal(I1 first1, S1 last1, I2 first2, S2 last2,
// Pred pred = {},
// Proj1 proj1 = {}, Proj2 proj2 = {});
// template<input_range R1, input_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::equal(R1&& r1, R2&& r2, Pred pred = {},
// Proj1 proj1 = {}, Proj2 proj2 = {});
#include <algorithm>
#include <array>
#include <cassert>
#include <concepts>
#include <functional>
#include <ranges>
#include "almost_satisfies_types.h"
#include "test_iterators.h"
template <class Iter1, class Sent1 = sentinel_wrapper<Iter1>,
class Iter2 = Iter1, class Sent2 = sentinel_wrapper<Iter2>>
concept HasEqualIt = requires (Iter1 first1, Sent1 last1, Iter2 first2, Sent2 last2) {
std::ranges::equal(first1, last1, first2, last2);
};
static_assert(HasEqualIt<int*>);
static_assert(!HasEqualIt<InputIteratorNotDerivedFrom>);
static_assert(!HasEqualIt<InputIteratorNotIndirectlyReadable>);
static_assert(!HasEqualIt<InputIteratorNotInputOrOutputIterator>);
static_assert(!HasEqualIt<int*, int*, InputIteratorNotDerivedFrom>);
static_assert(!HasEqualIt<int*, int*, InputIteratorNotIndirectlyReadable>);
static_assert(!HasEqualIt<int*, int*, InputIteratorNotInputOrOutputIterator>);
static_assert(!HasEqualIt<int*, SentinelForNotSemiregular>);
static_assert(!HasEqualIt<int*, SentinelForNotWeaklyEqualityComparableWith>);
static_assert(!HasEqualIt<int*, int*, int*, SentinelForNotSemiregular>);
static_assert(!HasEqualIt<int*, int*, int*, SentinelForNotWeaklyEqualityComparableWith>);
static_assert(!HasEqualIt<int*, int*, int**>);
template <class Range1, class Range2>
concept HasEqualR = requires (Range1 range1, Range2 range2) {
std::ranges::equal(range1, range2);
};
static_assert(HasEqualR<UncheckedRange<int*>, UncheckedRange<int*>>);
static_assert(!HasEqualR<InputRangeNotDerivedFrom, UncheckedRange<int*>>);
static_assert(!HasEqualR<InputRangeNotIndirectlyReadable, UncheckedRange<int*>>);
static_assert(!HasEqualR<InputRangeNotInputOrOutputIterator, UncheckedRange<int*>>);
static_assert(!HasEqualR<InputRangeNotSentinelSemiregular, UncheckedRange<int*>>);
static_assert(!HasEqualR<InputRangeNotSentinelEqualityComparableWith, UncheckedRange<int*>>);
static_assert(!HasEqualR<UncheckedRange<int*>, InputRangeNotDerivedFrom>);
static_assert(!HasEqualR<UncheckedRange<int*>, InputRangeNotIndirectlyReadable>);
static_assert(!HasEqualR<UncheckedRange<int*>, InputRangeNotInputOrOutputIterator>);
static_assert(!HasEqualR<UncheckedRange<int*>, InputRangeNotSentinelSemiregular>);
static_assert(!HasEqualR<UncheckedRange<int*>, InputRangeNotSentinelEqualityComparableWith>);
static_assert(!HasEqualR<UncheckedRange<int*>, UncheckedRange<int**>>);
template <class Iter1, class Sent1, class Iter2, class Sent2 = Iter2>
constexpr void test_iterators() {
{ // simple test
{
int a[] = {1, 2, 3, 4};
int b[] = {1, 2, 3, 4};
std::same_as<bool> decltype(auto) ret = std::ranges::equal(Iter1(a), Sent1(Iter1(a + 4)),
Iter2(b), Sent2(Iter2(b + 4)));
assert(ret);
}
{
int a[] = {1, 2, 3, 4};
int b[] = {1, 2, 3, 4};
auto range1 = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 4)));
auto range2 = std::ranges::subrange(Iter2(b), Sent2(Iter2(b + 4)));
std::same_as<bool> decltype(auto) ret = std::ranges::equal(range1, range2);
assert(ret);
}
}
{ // check that false is returned for non-equal ranges
{
int a[] = {1, 2, 3, 4};
int b[] = {1, 2, 4, 4};
assert(!std::ranges::equal(Iter1(a), Sent1(Iter1(a + 4)), Iter2(b), Sent2(Iter2(b + 4))));
}
{
int a[] = {1, 2, 3, 4};
int b[] = {1, 2, 4, 4};
auto range1 = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 4)));
auto range2 = std::ranges::subrange(Iter2(b), Sent2(Iter2(b + 4)));
assert(!std::ranges::equal(range1, range2));
}
}
{ // check that the predicate is used (return true)
{
int a[] = {1, 2, 3, 4};
int b[] = {2, 3, 4, 5};
auto ret = std::ranges::equal(Iter1(a), Sent1(Iter1(a + 4)), Iter2(b), Sent2(Iter2(b + 4)),
[](int l, int r) { return l != r; });
assert(ret);
}
{
int a[] = {1, 2, 3, 4};
int b[] = {2, 3, 4, 5};
auto range1 = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 4)));
auto range2 = std::ranges::subrange(Iter2(b), Sent2(Iter2(b + 4)));
auto ret = std::ranges::equal(range1, range2, [](int l, int r) { return l != r; });
assert(ret);
}
}
{ // check that the predicate is used (return false)
{
int a[] = {1, 2, 3, 4};
int b[] = {2, 3, 3, 5};
auto ret = std::ranges::equal(Iter1(a), Sent1(Iter1(a + 4)), Iter2(b), Sent2(Iter2(b + 4)),
[](int l, int r) { return l != r; });
assert(!ret);
}
{
int a[] = {1, 2, 3, 4};
int b[] = {2, 3, 3, 5};
auto range1 = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 4)));
auto range2 = std::ranges::subrange(Iter2(b), Sent2(Iter2(b + 4)));
auto ret = std::ranges::equal(range1, range2, [](int l, int r) { return l != r; });
assert(!ret);
}
}
{ // check that the projections are used
{
int a[] = {1, 2, 3, 4, 5};
int b[] = {6, 10, 14, 18, 22};
auto ret = std::ranges::equal(Iter1(a), Sent1(Iter1(a + 5)),
Iter2(b), Sent2(Iter2(b + 5)),
{},
[](int i) { return i * 4; },
[](int i) { return i - 2; });
assert(ret);
}
{
int a[] = {1, 2, 3, 4, 5};
int b[] = {6, 10, 14, 18, 22};
auto range1 = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 5)));
auto range2 = std::ranges::subrange(Iter2(b), Sent2(Iter2(b + 5)));
auto ret = std::ranges::equal(range1,
range2,
{},
[](int i) { return i * 4; },
[](int i) { return i - 2; });
assert(ret);
}
}
{ // check that different sized ranges work
{
int a[] = {4, 3, 2, 1};
int b[] = {4, 3, 2, 1, 5, 6, 7};
auto ret = std::ranges::equal(Iter1(a), Sent1(Iter1(a + 4)), Iter2(b), Sent2(Iter2(b + 7)));
assert(!ret);
}
{
int a[] = {4, 3, 2, 1};
int b[] = {4, 3, 2, 1, 5, 6, 7};
auto range1 = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 4)));
auto range2 = std::ranges::subrange(Iter2(b), Sent2(Iter2(b + 7)));
auto ret = std::ranges::equal(range1, range2);
assert(!ret);
}
}
{ // check that two ranges with the same size but different values are different
{
int a[] = {4, 6, 34, 76, 5};
int b[] = {4, 6, 34, 67, 5};
auto ret = std::ranges::equal(Iter1(a), Sent1(Iter1(a + 5)), Iter2(b), Sent2(Iter2(b + 5)));
assert(!ret);
}
{
int a[] = {4, 6, 34, 76, 5};
int b[] = {4, 6, 34, 67, 5};
auto range1 = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 5)));
auto range2 = std::ranges::subrange(Iter2(b), Sent2(Iter2(b + 5)));
auto ret = std::ranges::equal(range1, range2);
assert(!ret);
}
}
{ // check that two empty ranges work
{
std::array<int, 0> a = {};
std::array<int, 0> b = {};
auto ret = std::ranges::equal(Iter1(a.data()), Sent1(Iter1(a.data())), Iter2(b.data()), Sent2(Iter2(b.data())));
assert(ret);
}
{
std::array<int, 0> a = {};
std::array<int, 0> b = {};
auto range1 = std::ranges::subrange(Iter1(a.data()), Sent1(Iter1(a.data())));
auto range2 = std::ranges::subrange(Iter2(b.data()), Sent2(Iter2(b.data())));
auto ret = std::ranges::equal(range1, range2);
assert(ret);
}
}
{ // check that it works with the first range empty
{
std::array<int, 0> a = {};
int b[] = {1, 2};
auto ret = std::ranges::equal(Iter1(a.data()), Sent1(Iter1(a.data())), Iter2(b), Sent2(Iter2(b + 2)));
assert(!ret);
}
{
std::array<int, 0> a = {};
int b[] = {1, 2};
auto range1 = std::ranges::subrange(Iter1(a.data()), Sent1(Iter1(a.data())));
auto range2 = std::ranges::subrange(Iter2(b), Sent2(Iter2(b + 2)));
auto ret = std::ranges::equal(range1, range2);
assert(!ret);
}
}
{ // check that it works with the second range empty
{
int a[] = {1, 2};
std::array<int, 0> b = {};
auto ret = std::ranges::equal(Iter1(a), Sent1(Iter1(a + 2)), Iter2(b.data()), Sent2(Iter2(b.data())));
assert(!ret);
}
{
int a[] = {1, 2};
std::array<int, 0> b = {};
auto range1 = std::ranges::subrange(Iter1(a), Sent1(Iter1(a + 2)));
auto range2 = std::ranges::subrange(Iter2(b.data()), Sent2(Iter2(b.data())));
auto ret = std::ranges::equal(range1, range2);
assert(!ret);
}
}
}
template<class Iter1, class Sent1 = Iter1>
constexpr void test_iterators2() {
test_iterators<Iter1, Sent1, cpp17_input_iterator<int*>, sentinel_wrapper<cpp17_input_iterator<int*>>>();
test_iterators<Iter1, Sent1, cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>();
test_iterators<Iter1, Sent1, forward_iterator<int*>>();
test_iterators<Iter1, Sent1, bidirectional_iterator<int*>>();
test_iterators<Iter1, Sent1, random_access_iterator<int*>>();
test_iterators<Iter1, Sent1, contiguous_iterator<int*>>();
test_iterators<Iter1, Sent1, int*>();
test_iterators<Iter1, Sent1, const int*>();
}
constexpr bool test() {
test_iterators2<cpp17_input_iterator<int*>, sentinel_wrapper<cpp17_input_iterator<int*>>>();
test_iterators2<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>();
test_iterators2<forward_iterator<int*>>();
test_iterators2<bidirectional_iterator<int*>>();
test_iterators2<random_access_iterator<int*>>();
test_iterators2<contiguous_iterator<int*>>();
test_iterators2<int*>();
test_iterators2<const int*>();
{ // check that std::invoke is used
struct S {
constexpr S(int i_) : i(i_) {}
constexpr bool equal(int o) { return i == o; }
constexpr S& identity() { return *this; }
int i;
};
{
S a[] = {7, 8, 9};
S b[] = {7, 8, 9};
auto ret = std::ranges::equal(a, a + 3, b, b + 3, &S::equal, &S::identity, &S::i);
assert(ret);
}
{
S a[] = {7, 8, 9};
S b[] = {7, 8, 9};
auto ret = std::ranges::equal(a, b, &S::equal, &S::identity, &S::i);
assert(ret);
}
}
{ // check that the complexity requirements are met
{ // different size
{
int a[] = {1, 2, 3};
int b[] = {1, 2, 3, 4};
int predCount = 0;
int projCount = 0;
auto pred = [&](int l, int r) { ++predCount; return l == r; };
auto proj = [&](int i) { ++projCount; return i; };
auto ret = std::ranges::equal(a, a + 3, b, b + 4, pred, proj, proj);
assert(!ret);
assert(predCount == 0);
assert(projCount == 0);
}
{
int a[] = {1, 2, 3};
int b[] = {1, 2, 3, 4};
int predCount = 0;
int projCount = 0;
auto pred = [&](int l, int r) { ++predCount; return l == r; };
auto proj = [&](int i) { ++projCount; return i; };
auto ret = std::ranges::equal(a, b, pred, proj, proj);
assert(!ret);
assert(predCount == 0);
assert(projCount == 0);
}
}
{ // not a sized sentinel
{
int a[] = {1, 2, 3};
int b[] = {1, 2, 3, 4};
int predCount = 0;
int projCount = 0;
auto pred = [&](int l, int r) { ++predCount; return l == r; };
auto proj = [&](int i) { ++projCount; return i; };
auto ret = std::ranges::equal(a, sentinel_wrapper(a + 3), b, sentinel_wrapper(b + 4), pred, proj, proj);
assert(!ret);
assert(predCount <= 4);
assert(projCount <= 7);
}
{
int a[] = {1, 2, 3};
int b[] = {1, 2, 3, 4};
int predCount = 0;
int projCount = 0;
auto pred = [&](int l, int r) { ++predCount; return l == r; };
auto proj = [&](int i) { ++projCount; return i; };
auto range1 = std::ranges::subrange(a, sentinel_wrapper(a + 3));
auto range2 = std::ranges::subrange(b, sentinel_wrapper(b + 4));
auto ret = std::ranges::equal(range1, range2, pred, proj, proj);
assert(!ret);
assert(predCount <= 4);
assert(projCount <= 7);
}
}
{ // same size
{
int a[] = {1, 2, 3};
int b[] = {1, 2, 3};
int predCount = 0;
int projCount = 0;
auto pred = [&](int l, int r) { ++predCount; return l == r; };
auto proj = [&](int i) { ++projCount; return i; };
auto ret = std::ranges::equal(a, a + 3, b, b + 3, pred, proj, proj);
assert(ret);
assert(predCount == 3);
assert(projCount == 6);
}
{
int a[] = {1, 2, 3};
int b[] = {1, 2, 3};
int predCount = 0;
int projCount = 0;
auto pred = [&](int l, int r) { ++predCount; return l == r; };
auto proj = [&](int i) { ++projCount; return i; };
auto ret = std::ranges::equal(a, b, pred, proj, proj);
assert(ret);
assert(predCount == 3);
assert(projCount == 6);
}
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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