cuda - how to cast thrust::device_vector<int> to raw pointer

Question

I have a thrust device_vector. I want to cast it to a raw pointer so that I can pass it to a kernel. How can I do so?

thrust::device_vector<int> dv(10);
//CAST TO RAW
kernel<<<bl,tpb>>>(pass raw)

Answer 1

You can do this using thrust::raw_pointer_cast. The device vector class has a member function data which will return a thrust::device_ptr to the memory held by the vector, which can be cast, something like this:

thrust::device_vector<int> dv(10);

int * dv_ptr = thrust::raw_pointer_cast(dv.data());

kernel<<<bl,tpb>>>(dv_ptr)

(disclaimer: written in browser, never compiled, never tested). There is a full working example of this included with thrust: unwrap_pointer.cu