import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.lang.IllegalStateException;
import java.io.IOException;
import java.io.DataInput;


public class TdApi {
    public abstract static class Object {
        public native String toString();

        public abstract int getConstructor();

        public byte[] serialize() throws IOException {
            try(var baos = new ByteArrayOutputStream()) {
                try(var out = new DataOutputStream(baos)) {
                    serialize(out);
                    return baos.toByteArray();
                }
            }
        }

        public abstract void serialize(DataOutputStream out) throws IOException;
    }

    public abstract static class Function extends Object {
        public native String toString();
    }