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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&, InIter::reference> BinaryOperation>
// requires HasAssign<InIter::value_type, BinaryOperation::result_type>
// && Constructible<InIter::value_type, InIter::reference>
// && CopyConstructible<BinaryOperation>
// OutIter
// partial_sum(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_addable
{
bool correctOperatorUsed = false;
// make sure the predicate is passed an rvalue and an lvalue (so check that the first argument was moved)
constexpr rvalue_addable operator()(rvalue_addable&& r, rvalue_addable const&) {
r.correctOperatorUsed = true;
return std::move(r);
}
};
constexpr rvalue_addable operator+(rvalue_addable& lhs, rvalue_addable const&)
{
lhs.correctOperatorUsed = false;
return lhs;
}
constexpr rvalue_addable operator+(rvalue_addable&& lhs, rvalue_addable const&)
{
lhs.correctOperatorUsed = true;
return std::move(lhs);
}
constexpr void
test_use_move()
{
const std::size_t size = 100;
rvalue_addable arr[size];
rvalue_addable res1[size];
rvalue_addable res2[size];
std::partial_sum(arr, arr + size, res1);
std::partial_sum(arr, arr + size, res2, /*predicate=*/rvalue_addable());
// 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[] = {1, 2, 3, 4, 5};
int ir[] = {1, -1, -4, -8, -13};
const unsigned s = sizeof(ia) / sizeof(ia[0]);
int ib[s] = {0};
OutIter r = std::partial_sum(InIter(ia), InIter(ia+s), OutIter(ib), std::minus<int>());
assert(base(r) == ib + s);
for (unsigned i = 0; i < s; ++i)
assert(ib[i] == ir[i]);
}
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 > 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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