text: /*
   *  Copyright 2008-2012 NVIDIA Corporation
   *
   *  Licensed under the Apache License, Version 2.0 (the "License");
   *  you may not use this file except in compliance with the License.
   *  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  
  #pragma once
  
  #include <thrust/detail/config.h>
  #include <thrust/system/cuda/detail/trivial_copy.h>
  #include <thrust/system/cuda/detail/guarded_cuda_runtime_api.h>
  #include <thrust/system_error.h>
  #include <thrust/system/cuda/error.h>
  #include <thrust/iterator/iterator_traits.h>
  #include <thrust/system/cpp/detail/execution_policy.h>
  #include <thrust/detail/raw_pointer_cast.h>
  
  namespace thrust
  {
  namespace system
  {
  namespace cuda
  {
  namespace detail
  {
  
  namespace trivial_copy_detail
  {
  
  inline void checked_cudaMemcpy(void *dst, const void *src, size_t count, enum cudaMemcpyKind kind)
  {
    cudaError_t error = cudaMemcpy(dst,src,count,kind);
    if(error)
    {
      throw thrust::system_error(error, thrust::cuda_category());
    } // end error
  } // end checked_cudaMemcpy()
  
  
  template<typename System1,
           typename System2>
    cudaMemcpyKind cuda_memcpy_kind(const thrust::cuda::execution_policy<System1> &,
                                    const thrust::cpp::execution_policy<System2> &)
  {
    return cudaMemcpyDeviceToHost;
  } // end cuda_memcpy_kind()
  
  
  template<typename System1,
           typename System2>
    cudaMemcpyKind cuda_memcpy_kind(const thrust::cpp::execution_policy<System1> &,
                                    const thrust::cuda::execution_policy<System2> &)
  {
    return cudaMemcpyHostToDevice;
  } // end cuda_memcpy_kind()
  
  
  } // end namespace trivial_copy_detail
  
  
  template<typename DerivedPolicy,
           typename RandomAccessIterator1,
           typename Size,
           typename RandomAccessIterator2>
    void trivial_copy_n(execution_policy<DerivedPolicy> &exec,
                        RandomAccessIterator1 first,
                        Size n,
                        RandomAccessIterator2 result)
  {
    typedef typename thrust::iterator_value<RandomAccessIterator1>::type T;
  
    void *dst = thrust::raw_pointer_cast(&*result);
    const void *src = thrust::raw_pointer_cast(&*first);
  
    trivial_copy_detail::checked_cudaMemcpy(dst, src, n * sizeof(T), cudaMemcpyDeviceToDevice);
  }
  
  
  template<typename System1,
           typename System2,
           typename RandomAccessIterator1,
           typename Size,
           typename RandomAccessIterator2>
    void trivial_copy_n(cross_system<System1,System2> &systems,
                        RandomAccessIterator1 first,
                        Size n,
                        RandomAccessIterator2 result)
  {
    typedef typename thrust::iterator_value<RandomAccessIterator1>::type T;
  
    void *dst = thrust::raw_pointer_cast(&*result);
    const void *src = thrust::raw_pointer_cast(&*first);
  
    cudaMemcpyKind kind = trivial_copy_detail::cuda_memcpy_kind(thrust::detail::derived_cast(systems.system1), thrust::detail::derived_cast(systems.system2));
  
    trivial_copy_detail::checked_cudaMemcpy(dst, src, n * sizeof(T), kind);
  }
  
  
  } // end namespace detail
  } // end namespace cuda
  } // end namespace system
  } // end namespace thrust
  
  