Use virtual functions instead of type checkingThis tip submitted by Sajan on 2010-07-06 11:45:52. It has been viewed 7903 times.Rating of 8.3 with 71 votes Use virtual functions as part of interfaces instead of type checking with if-else. Suppose in the scenario of creating a phone object based on type
// Psuedo code only
enum PhType { mobile, land };
if(PhType == mobile)
{
// Process mobile phone
}
else if(PhType == land)
{
// Process land phone
}
Above is the structural approach. Instead make use of object-oriented programming OOPS implementation of the approach
// Psuedo code only
class Phone
{
public:
virtual void ProcessPhone();
};
class LandPhone : public Phone
{
public:
void ProcessPhone();
}
class CellPhone : public Phone
{
void ProcessPhone();
}
int main ()
{
Phone *ph = new CellPhone();
ph->ProcessPhone(); // This will invoke the business logic based on the object type..
}
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