C++ (Cpp) vector_slice::begin Exemples

Exemple #1

Fichier : vector_proxy.hpp Projet : GnsP/viennacl-dev

  void copy(vector_slice<vector<SCALARTYPE> > const & gpu_vector_slice,
            VectorType & cpu_vector)
  {
    assert(gpu_vector_slice.end() - gpu_vector_slice.begin() >= 0 && bool("Range must have nonnegative length!"));

    if (gpu_vector_slice.end() - gpu_vector_slice.begin() > 0)
    {
      std::vector<SCALARTYPE> temp_buffer(gpu_vector_slice.stride() * gpu_vector_slice.size());
      viennacl::backend::memory_read(gpu_vector_slice.handle(), sizeof(SCALARTYPE)*gpu_vector_slice.start(), sizeof(SCALARTYPE)*temp_buffer.size(), &(temp_buffer[0]));

      for (vcl_size_t i=0; i<cpu_vector.size(); ++i)
        cpu_vector[i] = temp_buffer[i * gpu_vector_slice.stride()];
    }
  }