Function librocksdb_sys::rocksdb_transaction_begin

pub unsafe extern "C" fn rocksdb_transaction_begin(
    txn_db: *mut rocksdb_transactiondb_t, 
    write_options: *const rocksdb_writeoptions_t, 
    txn_options: *const rocksdb_transaction_options_t, 
    old_txn: *mut rocksdb_transaction_t
) -> *mut rocksdb_transaction_t