Function cusparseXcsrgeam2Nnz 

pub unsafe extern "C" fn cusparseXcsrgeam2Nnz(
    handle: cusparseHandle_t,
    m: c_int,
    n: c_int,
    descrA: cusparseMatDescr_t,
    nnzA: c_int,
    csrSortedRowPtrA: *const c_int,
    csrSortedColIndA: *const c_int,
    descrB: cusparseMatDescr_t,
    nnzB: c_int,
    csrSortedRowPtrB: *const c_int,
    csrSortedColIndB: *const c_int,
    descrC: cusparseMatDescr_t,
    csrSortedRowPtrC: *mut c_int,
    nnzTotalDevHostPtr: *mut c_int,
    workspace: *mut c_void,
) -> cusparseStatus_t