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#include <unittest/unittest.h>
#include <thrust/pair.h>
#include <thrust/sort.h>
#include <thrust/transform.h>
#include <thrust/sequence.h>
#include <thrust/execution_policy.h>
#ifdef THRUST_TEST_DEVICE_SIDE
template<typename ExecutionPolicy, typename Iterator1, typename Iterator2>
__global__
void stable_sort_by_key_kernel(ExecutionPolicy exec, Iterator1 keys_first, Iterator1 keys_last, Iterator2 values_first)
{
thrust::stable_sort_by_key(exec, keys_first, keys_last, values_first);
}
struct make_pair_functor
{
template <typename T1, typename T2>
THRUST_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
template<typename ExecutionPolicy>
void TestPairStableSortByKeyDevice(ExecutionPolicy exec)
{
size_t n = 10000;
typedef thrust::pair<int,int> P;
// host arrays
thrust::host_vector<int> h_p1 = unittest::random_integers<int>(n);
thrust::host_vector<int> h_p2 = unittest::random_integers<int>(n);
thrust::host_vector<P> h_pairs(n);
thrust::host_vector<int> h_values(n);
thrust::sequence(h_values.begin(), h_values.end());
// zip up pairs on the host
thrust::transform(h_p1.begin(), h_p1.end(), h_p2.begin(), h_pairs.begin(), make_pair_functor());
// device arrays
thrust::device_vector<P> d_pairs = h_pairs;
thrust::device_vector<int> d_values = h_values;
// sort on the device
stable_sort_by_key_kernel<<<1,1>>>(exec, d_pairs.begin(), d_pairs.end(), d_values.begin());
cudaError_t const err = cudaDeviceSynchronize();
ASSERT_EQUAL(cudaSuccess, err);
// sort on the host
thrust::stable_sort_by_key(h_pairs.begin(), h_pairs.end(), h_values.begin());
ASSERT_EQUAL_QUIET(h_pairs, d_pairs);
ASSERT_EQUAL(h_values, d_values);
};
void TestPairStableSortByKeyDeviceSeq()
{
TestPairStableSortByKeyDevice(thrust::seq);
}
DECLARE_UNITTEST(TestPairStableSortByKeyDeviceSeq);
void TestPairStableSortByKeyDeviceDevice()
{
TestPairStableSortByKeyDevice(thrust::device);
}
DECLARE_UNITTEST(TestPairStableSortByKeyDeviceDevice);
#endif
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