For c++, virutal funciton invocation during construction or destruction use virtual funcitons defined in base classes. Here is an example.
#include <iostream>
using namespace std;
class Transaction {
public:
Transaction() {
logTransaction();
}
virtual void logTransaction() {
cout << "Transaction logTransaction" << endl;
}
};
class BuyTransaction: public Transaction {
public:
virtual void logTransaction() const;
};
void BuyTransaction::logTransaction() const {
cout << "BuyTransaction logTransaction" << endl;
}
int main(int argc, const char *argv[])
{
BuyTransaction b;
return 0;
}
For Java, overridable method invocation during construction use method defined in sub class.
import java.util.*;
class Super {
// Broken - constructor invokes an overrided method
public Super() {
overrideMe();
}
public void overrideMe() {
}
}
final class Sub extends Super {
private final Date date; // Blank final, set by constructor
Sub() {
date = new Date();
}
// Overriding method invoked by superclass constructor
@Override
public void overrideMe() {
System.out.println(date);
}
}
public class Foo {
public static void main (String [] args) {
Sub s = new Sub();
}
}
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