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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>
// UNSUPPORTED: c++03, c++11, c++14
// UNSUPPORTED: clang-8
// Became constexpr in C++20
// template <class InputIterator1, class InputIterator2, class T,
// class BinaryOperation1, class BinaryOperation2>
// T transform_reduce(InputIterator1 first1, InputIterator1 last1,
// InputIterator2 first2, T init,
// BinaryOperation1 binary_op1, BinaryOperation2 binary_op2);
//
#include <numeric>
#include <cassert>
#include <iterator>
#include "test_macros.h"
#include "MoveOnly.h"
#include "test_iterators.h"
template <class Iter1, class Iter2, class T, class Op1, class Op2>
TEST_CONSTEXPR_CXX20 void
test(Iter1 first1, Iter1 last1, Iter2 first2, T init, Op1 op1, Op2 op2, T x)
{
static_assert( std::is_same_v<T,
decltype(std::transform_reduce(first1, last1, first2, init, op1, op2))> );
assert(std::transform_reduce(first1, last1, first2, init, op1, op2) == x);
}
template <class SIter, class UIter>
TEST_CONSTEXPR_CXX20 void
test()
{
int ia[] = {1, 2, 3, 4, 5, 6};
unsigned int ua[] = {2, 4, 6, 8, 10,12};
unsigned sa = sizeof(ia) / sizeof(ia[0]);
assert(sa == sizeof(ua) / sizeof(ua[0])); // just to be sure
test(SIter(ia), SIter(ia), UIter(ua), 0, std::plus<>(), std::multiplies<>(), 0);
test(UIter(ua), UIter(ua), SIter(ia), 1, std::multiplies<>(), std::plus<>(), 1);
test(SIter(ia), SIter(ia+1), UIter(ua), 0, std::multiplies<>(), std::plus<>(), 0);
test(UIter(ua), UIter(ua+1), SIter(ia), 2, std::plus<>(), std::multiplies<>(), 4);
test(SIter(ia), SIter(ia+2), UIter(ua), 0, std::plus<>(), std::multiplies<>(), 10);
test(UIter(ua), UIter(ua+2), SIter(ia), 3, std::multiplies<>(), std::plus<>(), 54);
test(SIter(ia), SIter(ia+sa), UIter(ua), 4, std::multiplies<>(), std::plus<>(), 2099520);
test(UIter(ua), UIter(ua+sa), SIter(ia), 4, std::plus<>(), std::multiplies<>(), 186);
}
template <typename T, typename Init>
TEST_CONSTEXPR_CXX20 void
test_return_type()
{
T *p = nullptr;
static_assert( std::is_same_v<Init,
decltype(std::transform_reduce(p, p, p, Init{}, std::plus<>(), std::multiplies<>()))> );
}
TEST_CONSTEXPR_CXX20 void
test_move_only_types()
{
MoveOnly ia[] = {{1}, {2}, {3}};
MoveOnly ib[] = {{1}, {2}, {3}};
assert(14 ==
std::transform_reduce(std::begin(ia), std::end(ia), std::begin(ib), MoveOnly{0},
[](const MoveOnly& lhs, const MoveOnly& rhs) { return MoveOnly{lhs.get() + rhs.get()}; },
[](const MoveOnly& lhs, const MoveOnly& rhs) { return MoveOnly{lhs.get() * rhs.get()}; }).get());
}
TEST_CONSTEXPR_CXX20 bool
test()
{
test_return_type<char, int>();
test_return_type<int, int>();
test_return_type<int, unsigned long>();
test_return_type<float, int>();
test_return_type<short, float>();
test_return_type<double, char>();
test_return_type<char, double>();
// All the iterator categories
test<input_iterator <const int*>, input_iterator <const unsigned int*> >();
test<input_iterator <const int*>, forward_iterator <const unsigned int*> >();
test<input_iterator <const int*>, bidirectional_iterator<const unsigned int*> >();
test<input_iterator <const int*>, random_access_iterator<const unsigned int*> >();
test<forward_iterator <const int*>, input_iterator <const unsigned int*> >();
test<forward_iterator <const int*>, forward_iterator <const unsigned int*> >();
test<forward_iterator <const int*>, bidirectional_iterator<const unsigned int*> >();
test<forward_iterator <const int*>, random_access_iterator<const unsigned int*> >();
test<bidirectional_iterator<const int*>, input_iterator <const unsigned int*> >();
test<bidirectional_iterator<const int*>, forward_iterator <const unsigned int*> >();
test<bidirectional_iterator<const int*>, bidirectional_iterator<const unsigned int*> >();
test<bidirectional_iterator<const int*>, random_access_iterator<const unsigned int*> >();
test<random_access_iterator<const int*>, input_iterator <const unsigned int*> >();
test<random_access_iterator<const int*>, forward_iterator <const unsigned int*> >();
test<random_access_iterator<const int*>, bidirectional_iterator<const unsigned int*> >();
test<random_access_iterator<const int*>, random_access_iterator<const unsigned int*> >();
// just plain pointers (const vs. non-const, too)
test<const int*, const unsigned int *>();
test<const int*, unsigned int *>();
test< int*, const unsigned int *>();
test< int*, unsigned int *>();
test_move_only_types();
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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