133 lines
3.8 KiB
C++
133 lines
3.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <numeric>
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// Became constexpr in C++20
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// template <InputIterator Iter, MoveConstructible T,
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// Callable<auto, const T&, Iter::reference> BinaryOperation>
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// requires HasAssign<T, BinaryOperation::result_type>
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// && CopyConstructible<BinaryOperation>
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// T
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// accumulate(Iter first, Iter last, T init, BinaryOperation binary_op);
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#include <numeric>
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#include <functional>
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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#if TEST_STD_VER > 17
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struct rvalue_addable
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{
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bool correctOperatorUsed = false;
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// make sure the predicate is passed an rvalue and an lvalue (so check that the first argument was moved)
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constexpr rvalue_addable operator()(rvalue_addable&& r, rvalue_addable const&) {
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r.correctOperatorUsed = true;
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return std::move(r);
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}
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};
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constexpr rvalue_addable operator+(rvalue_addable& lhs, rvalue_addable const&)
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{
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lhs.correctOperatorUsed = false;
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return lhs;
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}
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constexpr rvalue_addable operator+(rvalue_addable&& lhs, rvalue_addable const&)
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{
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lhs.correctOperatorUsed = true;
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return std::move(lhs);
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}
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constexpr void
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test_use_move()
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{
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rvalue_addable arr[100];
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auto res1 = std::accumulate(arr, arr + 100, rvalue_addable());
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auto res2 = std::accumulate(arr, arr + 100, rvalue_addable(), /*predicate=*/rvalue_addable());
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assert(res1.correctOperatorUsed);
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assert(res2.correctOperatorUsed);
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}
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#endif // TEST_STD_VER > 17
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// C++20 can use string in constexpr evaluation, but both libc++ and MSVC
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// don't have the support yet. In these cases omit the constexpr test.
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// FIXME Remove constexpr string workaround introduced in D90569
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#if TEST_STD_VER > 17 && \
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(!defined(__cpp_lib_constexpr_string) || __cpp_lib_constexpr_string < 201907L)
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void
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#else
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TEST_CONSTEXPR_CXX20 void
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#endif
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test_string()
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{
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std::string sa[] = {"a", "b", "c"};
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assert(std::accumulate(sa, sa + 3, std::string()) == "abc");
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assert(std::accumulate(sa, sa + 3, std::string(), std::plus<std::string>()) == "abc");
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}
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template <class Iter, class T>
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TEST_CONSTEXPR_CXX20 void
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test(Iter first, Iter last, T init, T x)
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{
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assert(std::accumulate(first, last, init, std::multiplies<T>()) == x);
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}
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template <class Iter>
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TEST_CONSTEXPR_CXX20 void
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test()
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{
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int ia[] = {1, 2, 3, 4, 5, 6};
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unsigned sa = sizeof(ia) / sizeof(ia[0]);
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test(Iter(ia), Iter(ia), 1, 1);
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test(Iter(ia), Iter(ia), 10, 10);
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test(Iter(ia), Iter(ia+1), 1, 1);
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test(Iter(ia), Iter(ia+1), 10, 10);
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test(Iter(ia), Iter(ia+2), 1, 2);
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test(Iter(ia), Iter(ia+2), 10, 20);
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test(Iter(ia), Iter(ia+sa), 1, 720);
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test(Iter(ia), Iter(ia+sa), 10, 7200);
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}
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TEST_CONSTEXPR_CXX20 bool
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test()
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{
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test<cpp17_input_iterator<const int*> >();
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test<forward_iterator<const int*> >();
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test<bidirectional_iterator<const int*> >();
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test<random_access_iterator<const int*> >();
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test<const int*>();
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#if TEST_STD_VER > 17
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test_use_move();
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#endif // TEST_STD_VER > 17
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// C++20 can use string in constexpr evaluation, but both libc++ and MSVC
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// don't have the support yet. In these cases omit the constexpr test.
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// FIXME Remove constexpr string workaround introduced in D90569
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#if TEST_STD_VER > 17 && \
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(!defined(__cpp_lib_constexpr_string) || __cpp_lib_constexpr_string < 201907L)
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if (!std::is_constant_evaluated())
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#endif
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test_string();
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return true;
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}
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int main(int, char**)
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{
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test();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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return 0;
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}
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