class Parent
{
public:
Parent();
~Parent();
Update();
};
Parent::Parent(){
}
Parent::~Parent(){
}
Parent::Update(){
// Update X
}
class Child : public Parent
{
public:
Child();
~Child();
Update();
};
Child::Child(){
}
Child::~Child(){
}
Child::Update(){
// Call parent Update() to update X
// Now update y
}
c++ inheritance question
Author
Say I inherit a class but instead of overriding a function, I want to append on to it. Is there a way to call the parent function first from the child class?
example:
You should of course ensure that the parent class has a virtual destructor, and also ensure that any member functions you redefine are virtual too.
is it a rule of thumb that all inherited classes have their respective destructors virtualized? even if they are non-existant or empty?
Quote:Original post by pcxmacWith public inheritance yes (99.5% of cases). With private and protected inheritance it depends.
is it a rule of thumb that all inherited classes have their respective destructors virtualized? even if they are non-existant or empty?
Quote:Original post by tjrr3dAs an alternative to what hplus0603 said, a "template method" may be used:
Say I inherit a class but instead of overriding a function, I want to append on to it. Is there a way to call the parent function first from the child class?
example:
*** Source Snippet Removed ***
class Parent{ public: Parent(); virtual ~Parent(); void Update() { ...code...; doUpdate(); } private: virtual void doUpdate()=0;};And now Child-class just needs to do whatever it wants in doUpdate, and not worry about what else the parent-class's Update is doing. When using the class, you'll actually be calling Update (a public method) instead of doUpdate (a virtual private method).
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