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I'm working with CUDA and I have created an int2_ class to deal with complex integer numbers. Class declarations in the ComplexTypes.h file as follows: namespace LibraryNameSpace { class int2_ { public: int x; int y; // Constructors __host__ __device__ int2_(const int,const int); __host__ __device__ int2_(); // etc. // Equalities with other types __host__ __device__ const int2_& operator=(const int); __host__ __device__ const int2_& operator=(const float); // etc. }; } Class implementations in the ComplexTypes.cpp file as follows: #include "ComplexTypes.h" __host__ __device__ LibraryNameSpace::int2_::int2_(const int x_,const int y_) { x=x_; y=y_;} __host__ __device__ LibraryNameSpace::int2_::int2_() {} // etc. __host__ __device__ const LibraryNameSpace::int2_& LibraryNameSpace::int2_::operator=(const int a) { x = a; y = 0.; return *this; } __host__ __device__ const LibraryNameSpace::int2_& LibraryNameSpace::int2_::operator=(const float a) { x = (int)a; y = 0.; return *this; } // etc. Everything works well. In the main (which includes ComplexTypes.h ) I could deal with int2_ numbers. In the CudaMatrix.cu file, I'm now including ComplexTypes.h and defining and properly instantiating the __global__ function: template <class T1, class T2> __global__ void evaluation_matrix(T1* data_, T2* ob, int NumElements) { const int i = blockDim.x * blockIdx.x + threadIdx.x; if(i < NumElements) data_[i] = ob[i]; } template __global__ void evaluation_matrix(LibraryNameSpace::in

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