MPI_Comm_delete_attr_function *comm_delete_fn;
MPI_Type_delete_attr_function *type_delete_fn;
MPI_Win_delete_attr_function *win_delete_fn;
MPI_Comm_delete_attr_function *comm_delete_fn;
MPI_Type_delete_attr_function *type_delete_fn;
MPI_Win_delete_attr_function *win_delete_fn;
MPI_Comm_copy_attr_function *comm_copy_fn;
MPI_Type_copy_attr_function *type_copy_fn;
MPI_Win_copy_attr_function *win_copy_fn;
MPI_Comm_copy_attr_function *comm_copy_fn;
MPI_Type_copy_attr_function *type_copy_fn;
MPI_Win_copy_attr_function *win_copy_fn;
template <typename T> int Keyval::keyval_create(smpi_copy_fn copy_fn, smpi_delete_fn delete_fn, int* keyval, void* extra_state){
template <typename T> int Keyval::keyval_create(smpi_copy_fn copy_fn, smpi_delete_fn delete_fn, int* keyval, void* extra_state){