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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>
// template<InputIterator Iter1, InputIterator Iter2>
// requires HasEqualTo<Iter1::value_type, Iter2::value_type>
// constexpr bool // constexpr after c++17
// equal(Iter1 first1, Iter1 last1, Iter2 first2);
//
// Introduced in C++14:
// template<InputIterator Iter1, InputIterator Iter2>
// constexpr bool // constexpr after c++17
// equal(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2);
// We test the cartesian product, so we sometimes compare differently signed types
// ADDITIONAL_COMPILE_FLAGS(gcc-style-warnings): -Wno-sign-compare
// MSVC warning C4242: 'argument': conversion from 'int' to 'const _Ty', possible loss of data
// MSVC warning C4244: 'argument': conversion from 'wchar_t' to 'const _Ty', possible loss of data
// MSVC warning C4389: '==': signed/unsigned mismatch
// ADDITIONAL_COMPILE_FLAGS(cl-style-warnings): /wd4242 /wd4244 /wd4389
#include <algorithm>
#include <cassert>
#include <functional>
#include "test_iterators.h"
#include "test_macros.h"
#include "type_algorithms.h"
template <class UnderlyingType, class Iter1>
struct Test {
template <class Iter2>
TEST_CONSTEXPR_CXX20 void operator()() {
UnderlyingType a[] = {0, 1, 2, 3, 4, 5};
const unsigned s = sizeof(a) / sizeof(a[0]);
UnderlyingType b[s] = {0, 1, 2, 5, 4, 5};
assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a)));
assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b)));
#if TEST_STD_VER >= 14
assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a), std::equal_to<>()));
assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b), std::equal_to<>()));
assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s)));
assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s - 1)));
assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b), Iter2(b + s)));
assert(std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s), std::equal_to<>()));
assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(a), Iter2(a + s - 1), std::equal_to<>()));
assert(!std::equal(Iter1(a), Iter1(a + s), Iter2(b), Iter2(b + s), std::equal_to<>()));
#endif
}
};
struct TestNarrowingEqualTo {
template <class UnderlyingType>
TEST_CONSTEXPR_CXX20 void operator()() {
TEST_DIAGNOSTIC_PUSH
// MSVC warning C4310: cast truncates constant value
TEST_MSVC_DIAGNOSTIC_IGNORED(4310)
UnderlyingType a[] = {
UnderlyingType(0x1000),
UnderlyingType(0x1001),
UnderlyingType(0x1002),
UnderlyingType(0x1003),
UnderlyingType(0x1004)};
UnderlyingType b[] = {
UnderlyingType(0x1600),
UnderlyingType(0x1601),
UnderlyingType(0x1602),
UnderlyingType(0x1603),
UnderlyingType(0x1604)};
TEST_DIAGNOSTIC_POP
assert(std::equal(a, a + 5, b, std::equal_to<char>()));
#if TEST_STD_VER >= 14
assert(std::equal(a, a + 5, b, b + 5, std::equal_to<char>()));
#endif
}
};
template <class UnderlyingType, class TypeList>
struct TestIter2 {
template <class Iter1>
TEST_CONSTEXPR_CXX20 void operator()() {
types::for_each(TypeList(), Test<UnderlyingType, Iter1>());
}
};
struct AddressCompare {
int i = 0;
TEST_CONSTEXPR_CXX20 AddressCompare(int) {}
operator char() { return static_cast<char>(i); }
friend TEST_CONSTEXPR_CXX20 bool operator==(const AddressCompare& lhs, const AddressCompare& rhs) {
return &lhs == &rhs;
}
friend TEST_CONSTEXPR_CXX20 bool operator!=(const AddressCompare& lhs, const AddressCompare& rhs) {
return &lhs != &rhs;
}
};
#if TEST_STD_VER >= 20
class trivially_equality_comparable {
public:
constexpr trivially_equality_comparable(int i) : i_(i) {}
bool operator==(const trivially_equality_comparable&) const = default;
private:
int i_;
};
#endif
TEST_CONSTEXPR_CXX20 bool test() {
types::for_each(types::cpp17_input_iterator_list<int*>(), TestIter2<int, types::cpp17_input_iterator_list<int*> >());
types::for_each(
types::cpp17_input_iterator_list<char*>(), TestIter2<char, types::cpp17_input_iterator_list<char*> >());
types::for_each(types::cpp17_input_iterator_list<AddressCompare*>(),
TestIter2<AddressCompare, types::cpp17_input_iterator_list<AddressCompare*> >());
types::for_each(types::integral_types(), TestNarrowingEqualTo());
#if TEST_STD_VER >= 20
types::for_each(
types::cpp17_input_iterator_list<trivially_equality_comparable*>{},
TestIter2<trivially_equality_comparable, types::cpp17_input_iterator_list<trivially_equality_comparable*>>{});
#endif
return true;
}
struct Base {};
struct Derived : virtual Base {};
struct TestTypes {
template <class T>
struct Test {
template <class U>
void operator()() {
T a[] = {1, 2, 3, 4, 5, 6};
U b[] = {1, 2, 3, 4, 5, 6};
assert(std::equal(a, a + 6, b));
}
};
template <class T>
void operator()() {
types::for_each(types::integer_types(), Test<T>());
}
};
int main(int, char**) {
test();
#if TEST_STD_VER >= 20
static_assert(test());
#endif
types::for_each(types::integer_types(), TestTypes());
types::for_each(types::as_pointers<types::cv_qualified_versions<int> >(),
TestIter2<int, types::as_pointers<types::cv_qualified_versions<int> > >());
types::for_each(types::as_pointers<types::cv_qualified_versions<char> >(),
TestIter2<char, types::as_pointers<types::cv_qualified_versions<char> > >());
{
Derived d;
Derived* a[] = {&d, nullptr};
Base* b[] = {&d, nullptr};
assert(std::equal(a, a + 2, b));
#if TEST_STD_VER >= 14
assert(std::equal(a, a + 2, b, b + 2));
#endif
}
return 0;
}
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