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#include <unittest/unittest.h>
#include <thrust/pair.h>
#include <thrust/transform.h>
#include <thrust/reduce.h>
struct make_pair_functor
{
template<typename T1, typename T2>
__host__ __device__
thrust::pair<T1,T2> operator()(const T1 &x, const T2 &y)
{
return thrust::make_pair(x,y);
} // end operator()()
}; // end make_pair_functor
struct add_pairs
{
template <typename Pair1, typename Pair2>
__host__ __device__
Pair1 operator()(const Pair1 &x, const Pair2 &y)
{
// Need cast to undo integer promotion, decltype(char{} + char{}) == int
using P1T1 = typename Pair1::first_type;
using P1T2 = typename Pair1::second_type;
return thrust::make_pair(static_cast<P1T1>(x.first + y.first),
static_cast<P1T2>(x.second + y.second));
} // end operator()
}; // end add_pairs
template <typename T>
struct TestPairReduce
{
void operator()(const size_t n)
{
typedef thrust::pair<T,T> P;
thrust::host_vector<T> h_p1 = unittest::random_integers<T>(n);
thrust::host_vector<T> h_p2 = unittest::random_integers<T>(n);
thrust::host_vector<P> h_pairs(n);
// zip up pairs on the host
thrust::transform(h_p1.begin(), h_p1.end(), h_p2.begin(), h_pairs.begin(), make_pair_functor());
thrust::device_vector<T> d_p1 = h_p1;
thrust::device_vector<T> d_p2 = h_p2;
thrust::device_vector<P> d_pairs = h_pairs;
P init = thrust::make_pair(T{13}, T{13});
// reduce on the host
P h_result = thrust::reduce(h_pairs.begin(), h_pairs.end(), init, add_pairs());
// reduce on the device
P d_result = thrust::reduce(d_pairs.begin(), d_pairs.end(), init, add_pairs());
ASSERT_EQUAL_QUIET(h_result, d_result);
}
}; // end TestPairReduce
VariableUnitTest<TestPairReduce, SignedIntegralTypes> TestPairReduceInstance;
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