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#pragma once

#include <thrust/detail/config.h>
#include <thrust/system/cuda/detail/guarded_cuda_runtime_api.h>
#include <thrust/system/cuda/detail/execution_policy.h>
#include <thrust/system/cuda/detail/util.h>

#include <thrust/detail/allocator_aware_execution_policy.h>

#if THRUST_CPP_DIALECT >= 2011
#  include <thrust/detail/dependencies_aware_execution_policy.h>
#endif


THRUST_NAMESPACE_BEGIN
namespace cuda_cub {

template <class Derived>
struct execute_on_stream_base : execution_policy<Derived>
{
private:
  cudaStream_t stream;

public:
  __host__ __device__
  execute_on_stream_base(cudaStream_t stream_ = default_stream())
      : stream(stream_) {}

  THRUST_RUNTIME_FUNCTION
  Derived
  on(cudaStream_t const &s) const
  {
    Derived result = derived_cast(*this);
    result.stream  = s;
    return result;
  }

private:
  friend __host__ __device__
  cudaStream_t
  get_stream(const execute_on_stream_base &exec)
  {
    return exec.stream;
  }
};

struct execute_on_stream : execute_on_stream_base<execute_on_stream>
{
  typedef execute_on_stream_base<execute_on_stream> base_t;

  __host__ __device__
  execute_on_stream() : base_t(){};
  __host__ __device__
  execute_on_stream(cudaStream_t stream) : base_t(stream){};
};


struct par_t : execution_policy<par_t>,
  thrust::detail::allocator_aware_execution_policy<
    execute_on_stream_base>
#if THRUST_CPP_DIALECT >= 2011
, thrust::detail::dependencies_aware_execution_policy<
    execute_on_stream_base>
#endif
{
  typedef execution_policy<par_t> base_t;

  __host__ __device__
  constexpr par_t() : base_t() {}

  typedef execute_on_stream stream_attachment_type;

  THRUST_RUNTIME_FUNCTION
  stream_attachment_type
  on(cudaStream_t const &stream) const
  {
    return execute_on_stream(stream);
  }
};

THRUST_INLINE_CONSTANT par_t par;
}    // namespace cuda_

namespace system {
namespace cuda {
  using thrust::cuda_cub::par;
  namespace detail {
    using thrust::cuda_cub::par_t;
  }
} // namesapce cuda
} // namespace system

namespace cuda {
using thrust::cuda_cub::par;
} // namespace cuda

THRUST_NAMESPACE_END