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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
//
//===----------------------------------------------------------------------===//
// <numeric>
// UNSUPPORTED: clang-8
// Became constexpr in C++20
// template <InputIterator InIter,
// OutputIterator<auto, const InIter::value_type&> OutIter,
// Callable<auto, const InIter::value_type&, const InIter::value_type&> BinaryOperation>
// requires Constructible<InIter::value_type, InIter::reference>
// && OutputIterator<OutIter, BinaryOperation::result_type>
// && MoveAssignable<InIter::value_type>
// && CopyConstructible<BinaryOperation>
// OutIter
// adjacent_difference(InIter first, InIter last, OutIter result, BinaryOperation binary_op);
#include <numeric>
#include <functional>
#include <string>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
struct rvalue_subtractable
{
bool correctOperatorUsed = false;
// make sure the predicate is passed an rvalue and an lvalue (so check that the first argument was moved)
constexpr rvalue_subtractable operator()(rvalue_subtractable const&, rvalue_subtractable&& r) {
r.correctOperatorUsed = true;
return std::move(r);
}
};
constexpr rvalue_subtractable operator-(rvalue_subtractable const&, rvalue_subtractable& rhs)
{
rhs.correctOperatorUsed = false;
return rhs;
}
constexpr rvalue_subtractable operator-(rvalue_subtractable const&, rvalue_subtractable&& rhs)
{
rhs.correctOperatorUsed = true;
return std::move(rhs);
}
constexpr void
test_use_move()
{
const std::size_t size = 100;
rvalue_subtractable arr[size];
rvalue_subtractable res1[size];
rvalue_subtractable res2[size];
std::adjacent_difference(arr, arr + size, res1);
std::adjacent_difference(arr, arr + size, res2, /*predicate=*/rvalue_subtractable());
// start at 1 because the first element is not moved
for (unsigned i = 1; i < size; ++i) assert(res1[i].correctOperatorUsed);
for (unsigned i = 1; i < size; ++i) assert(res2[i].correctOperatorUsed);
}
#endif // TEST_STD_VER > 17
// C++20 can use string in constexpr evaluation, but both libc++ and MSVC
// don't have the support yet. In these cases omit the constexpr test.
// FIXME Remove constexpr string workaround introduced in D90569
#if TEST_STD_VER > 17 && \
(!defined(__cpp_lib_constexpr_string) || __cpp_lib_constexpr_string < 201907L)
void
#else
TEST_CONSTEXPR_CXX20 void
#endif
test_string()
{
std::string sa[] = {"a", "b", "c"};
std::string sr[] = {"a", "ba", "cb"};
std::string output[3];
std::adjacent_difference(sa, sa + 3, output, std::plus<std::string>());
for (unsigned i = 0; i < 3; ++i) assert(output[i] == sr[i]);
}
template <class InIter, class OutIter>
TEST_CONSTEXPR_CXX20 void
test()
{
int ia[] = {15, 10, 6, 3, 1};
int ir[] = {15, 25, 16, 9, 4};
const unsigned s = sizeof(ia) / sizeof(ia[0]);
int ib[s] = {0};
OutIter r = std::adjacent_difference(InIter(ia), InIter(ia+s), OutIter(ib),
std::plus<int>());
assert(base(r) == ib + s);
for (unsigned i = 0; i < s; ++i)
assert(ib[i] == ir[i]);
}
#if TEST_STD_VER >= 11
class Y;
class X
{
int i_;
TEST_CONSTEXPR_CXX20 X& operator=(const X&);
public:
TEST_CONSTEXPR_CXX20 explicit X(int i) : i_(i) {}
TEST_CONSTEXPR_CXX20 X(const X& x) : i_(x.i_) {}
TEST_CONSTEXPR_CXX20 X& operator=(X&& x)
{
i_ = x.i_;
x.i_ = -1;
return *this;
}
TEST_CONSTEXPR_CXX20 friend X operator-(const X& x, const X& y) {return X(x.i_ - y.i_);}
friend class Y;
};
class Y
{
int i_;
TEST_CONSTEXPR_CXX20 Y& operator=(const Y&);
public:
TEST_CONSTEXPR_CXX20 explicit Y(int i) : i_(i) {}
TEST_CONSTEXPR_CXX20 Y(const Y& y) : i_(y.i_) {}
TEST_CONSTEXPR_CXX20 void operator=(const X& x) {i_ = x.i_;}
};
#endif
TEST_CONSTEXPR_CXX20 bool
test()
{
test<input_iterator<const int*>, output_iterator<int*> >();
test<input_iterator<const int*>, forward_iterator<int*> >();
test<input_iterator<const int*>, bidirectional_iterator<int*> >();
test<input_iterator<const int*>, random_access_iterator<int*> >();
test<input_iterator<const int*>, int*>();
test<forward_iterator<const int*>, output_iterator<int*> >();
test<forward_iterator<const int*>, forward_iterator<int*> >();
test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
test<forward_iterator<const int*>, random_access_iterator<int*> >();
test<forward_iterator<const int*>, int*>();
test<bidirectional_iterator<const int*>, output_iterator<int*> >();
test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
test<bidirectional_iterator<const int*>, int*>();
test<random_access_iterator<const int*>, output_iterator<int*> >();
test<random_access_iterator<const int*>, forward_iterator<int*> >();
test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
test<random_access_iterator<const int*>, random_access_iterator<int*> >();
test<random_access_iterator<const int*>, int*>();
test<const int*, output_iterator<int*> >();
test<const int*, forward_iterator<int*> >();
test<const int*, bidirectional_iterator<int*> >();
test<const int*, random_access_iterator<int*> >();
test<const int*, int*>();
#if TEST_STD_VER >= 11
X x[3] = {X(1), X(2), X(3)};
Y y[3] = {Y(1), Y(2), Y(3)};
std::adjacent_difference(x, x+3, y, std::minus<X>());
#endif
#if TEST_STD_VER > 17
test_use_move();
#endif // TEST_STD_VER > 17
// C++20 can use string in constexpr evaluation, but both libc++ and MSVC
// don't have the support yet. In these cases omit the constexpr test.
// FIXME Remove constexpr string workaround introduced in D90569
#if TEST_STD_VER > 17 && \
(!defined(__cpp_lib_constexpr_string) || __cpp_lib_constexpr_string < 201907L)
if (!std::is_constant_evaluated())
#endif
test_string();
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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