Re: Derived class & Function pointer

Hi everyone

I have a problem that many people probably came across before but I
didn't find an answer on the net yet ...

I have a base class Bass and 2 derived class DerivedA & DerivedB. I
can create an new instance of the DeriveA class but then need to
call a method of the DerivedB class to save the data of the base
class into a specific file format. So I thought of using function
pointer but can seem to figure it out:

class Base
{
public:
  float *data;
 Base() { data = new float[10]; }
 ~Base() { delete [] data; }
 virtual void SaveFormat() = 0;
}

class DerivedA : public Base
{
public:
 void SaveFormat() { // save data in file format A }
}

class DerivedB : public Base
{
public:
 void SaveFormat() { // save data in file format B }
}

int main()
{
 Base *derivedA = new Derived A;
 // now I want to save the data hold in derivedA but by using
SaveFormat from DerivedB ???
 ????
 // this is where I am lost... I tried
 void (Base::*SaveFormatPtrFunc)() = &DerivedB::SaveFormat;
 derivedA->*SaveFormatPtrFunc();
 // but that doesn't compile ;-(
}

Does anybody know what's the best way of doing this ?