| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // UNSUPPORTED: gcc-9 |
| |
| // 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; |
| } |