C / C++ / MFC

class A {
public:
   A() { }
   ~A() { }
};
 
class B : public A {
public:
   B() { }
   ~B() { }
};
 
B* b = new B();
delete b; // calls B::~B() and then A::~A() automatically
A* a = new B();
delete a; // calls A::~A() only, leaving stuff initialized by B::B() uninitialized

Jay03 wrote:

A* a = new B();

how can a Pointer to an A object create a new B object?

its like saying

int *a = new double;

void function(A* a) { ... } 

B* b = ...;
function(b);

Instrument* instrument = new Guitarr();
instrument->PlayNote("C");
instrument->PlayNote("F");
instrument->PlayNote("G");

Instrument* instrument = new Organ();
instrument->PlayNote("C");
instrument->PlayNote("F");
instrument->PlayNote("G");

Instrument* orchestra[3];
orchestra[0] = new Guitarr();
orchestra[1] = new Flute();
orchestra[2] = new Organ();
 
for(int i = 0; i < 3; ++i) {
   instrument->PlayNote("C");
   instrument->PlayNote("F");
   instrument->PlayNote("G");
}

Instrument* instrument = new Flute();
instrument->PlayNote("C");

B* b = new A();

class A { 
public:
   virtual void Method() { cout << "A::Method called"; }
};
 
class B : public A {
public:
   virtual void Method2() { cout << "B::Method2 called"; }
};
 
B* b = new A();
b->Method();  // Calls A::Method
b->Method2(); // Calls B::Method2...?

Guitarr* g = new Guitarr();
Flute* f = new Flute();
Organ* o = new Organ();

f-> PlayNote("C");
f-> PlayNote("F");
f-> PlayNote("G");
g-> PlayNote("C");
g-> PlayNote("F");
g-> PlayNote("G");
o-> PlayNote("C");
o-> PlayNote("F");
o-> PlayNote("G");

Maximilien wrote:

is it possible to use VB ( or other script language, like python, ... ) to call functions in our application ?

Maximilien wrote:

Any resources ? links ?

Jay03 wrote:

Im pretty sure Zac Howland knows

Jay03 wrote:

thanks for your help TOXCCT