| //===----------------------------------------------------------------------===// |
| // |
| // 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&, 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; |
| } |