c++ - Copying classes with pointers in CUDA -

i'm trying implement on cuda involves classes have pointers classes inside. found out need copy memory of pointers separately , here's approach

__host__ production * production::allocatetodevice() {    production * productionondevice;    size_t productionsize = sizeof(production);    cudamalloc((void **) &productionondevice, productionsize);    cudamemcpy(productionondevice, this, productionsize, cudamemcpyhosttodevice);     vertex * boundrootondevice;    cudamalloc((void **) &boundrootondevice, boundroot->getmemsize());    cudamemcpy(boundrootondevice, boundroot, boundroot->getmemsize(), cudamemcpyhosttodevice);     size_t boundrootpointersize = sizeof(vertex *);    cudamemcpy(&(productionondevice->boundroot), boundrootondevice, boundrootpointersize, cudamemcpyhosttodevice);     return productionondevice; } 

where

class production {      vertex * boundroot;      public:      production(vertex * root);     __host__ production * allocatetodevice();     __host__ __device__ vertex * getboundnode();     __host__ __device__ void execute();     __host__ __device__ size_t getsize();  }; 

as can see first copy production object itself, it's member vector , @ end i'm copying pointer. yet i'm getting access violation @ penultimate line. doing wrong?

this:

   cudamemcpy(&(productionondevice->boundroot), boundrootondevice,                boundrootpointersize, cudamemcpyhosttodevice); 

is illegal because have passed boundrootondevice (a device pointer) source pointer in host-to-device transfer. result in host attempting perform pointer indirection on device address, resulting in segfault.

presumably want perform device device copy in case.