| //===----------------------------------------------------------------------===// |
| // |
| // 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 Iter, MoveConstructible T, |
| // Callable<auto, const T&, Iter::reference> BinaryOperation> |
| // requires HasAssign<T, BinaryOperation::result_type> |
| // && CopyConstructible<BinaryOperation> |
| // T |
| // accumulate(Iter first, Iter last, T init, 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() |
| { |
| rvalue_addable arr[100]; |
| auto res1 = std::accumulate(arr, arr + 100, rvalue_addable()); |
| auto res2 = std::accumulate(arr, arr + 100, rvalue_addable(), /*predicate=*/rvalue_addable()); |
| assert(res1.correctOperatorUsed); |
| assert(res2.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"}; |
| assert(std::accumulate(sa, sa + 3, std::string()) == "abc"); |
| assert(std::accumulate(sa, sa + 3, std::string(), std::plus<std::string>()) == "abc"); |
| } |
| |
| template <class Iter, class T> |
| TEST_CONSTEXPR_CXX20 void |
| test(Iter first, Iter last, T init, T x) |
| { |
| assert(std::accumulate(first, last, init, std::multiplies<T>()) == x); |
| } |
| |
| template <class Iter> |
| TEST_CONSTEXPR_CXX20 void |
| test() |
| { |
| int ia[] = {1, 2, 3, 4, 5, 6}; |
| unsigned sa = sizeof(ia) / sizeof(ia[0]); |
| test(Iter(ia), Iter(ia), 1, 1); |
| test(Iter(ia), Iter(ia), 10, 10); |
| test(Iter(ia), Iter(ia+1), 1, 1); |
| test(Iter(ia), Iter(ia+1), 10, 10); |
| test(Iter(ia), Iter(ia+2), 1, 2); |
| test(Iter(ia), Iter(ia+2), 10, 20); |
| test(Iter(ia), Iter(ia+sa), 1, 720); |
| test(Iter(ia), Iter(ia+sa), 10, 7200); |
| } |
| |
| TEST_CONSTEXPR_CXX20 bool |
| test() |
| { |
| test<input_iterator<const int*> >(); |
| test<forward_iterator<const int*> >(); |
| test<bidirectional_iterator<const int*> >(); |
| test<random_access_iterator<const int*> >(); |
| test<const 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; |
| } |