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#include <thrust/execution_policy.h>
#include <thrust/functional.h>
#include <thrust/partition.h>
#include <unittest/unittest.h>
#ifdef THRUST_TEST_DEVICE_SIDE
template <typename ExecutionPolicy, typename Iterator1, typename Predicate, typename Iterator2>
__global__ void
partition_point_kernel(ExecutionPolicy exec, Iterator1 first, Iterator1 last, Predicate pred, Iterator2 result)
{
*result = thrust::partition_point(exec, first, last, pred);
}
template <typename T>
struct is_even
{
_CCCL_HOST_DEVICE bool operator()(T x) const
{
return ((int) x % 2) == 0;
}
};
template <typename ExecutionPolicy>
void TestPartitionPointDevice(ExecutionPolicy exec)
{
size_t n = 1000;
thrust::device_vector<int> v = unittest::random_integers<int>(n);
typedef typename thrust::device_vector<int>::iterator iterator;
iterator ref = thrust::stable_partition(v.begin(), v.end(), is_even<int>());
thrust::device_vector<iterator> result(1);
partition_point_kernel<<<1, 1>>>(exec, v.begin(), v.end(), is_even<int>(), result.begin());
cudaError_t const err = cudaDeviceSynchronize();
ASSERT_EQUAL(cudaSuccess, err);
ASSERT_EQUAL(ref - v.begin(), (iterator) result[0] - v.begin());
}
void TestPartitionPointDeviceSeq()
{
TestPartitionPointDevice(thrust::seq);
}
DECLARE_UNITTEST(TestPartitionPointDeviceSeq);
void TestPartitionPointDeviceDevice()
{
TestPartitionPointDevice(thrust::device);
}
DECLARE_UNITTEST(TestPartitionPointDeviceDevice);
#endif
void TestPartitionPointCudaStreams()
{
typedef thrust::device_vector<int> Vector;
typedef Vector::value_type T;
typedef Vector::iterator Iterator;
Vector v(4);
v[0] = 1;
v[1] = 1;
v[2] = 1;
v[3] = 0;
Iterator first = v.begin();
Iterator last = v.begin() + 4;
Iterator ref = first + 3;
cudaStream_t s;
cudaStreamCreate(&s);
ASSERT_EQUAL_QUIET(ref, thrust::partition_point(thrust::cuda::par.on(s), first, last, thrust::identity<T>()));
last = v.begin() + 3;
ref = last;
ASSERT_EQUAL_QUIET(ref, thrust::partition_point(thrust::cuda::par.on(s), first, last, thrust::identity<T>()));
cudaStreamDestroy(s);
}
DECLARE_UNITTEST(TestPartitionPointCudaStreams);
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