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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>
// 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
TEST_CONSTEXPR_CXX20 void 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<cpp17_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
test_string();
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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