Declaring an Interface
Here is a small sample showing how to declare an interface to a class (called ‘A’):
// Declaration of class A
class A
: public IlvDvInterface
{
public:
void setX(int x) { _x = x; } < /FONT >
int getX() const { return _x; }
protected:
int _x;
};
// Implementation file of A. Use the following macros to
// introspect methods setX, getX, and field _x:
IlvDvBeginInterface(A)
Method1(SetX, setX)
TypedMethod (GetX, getX)
Field(X, _x)
IlvDvEndInterface()
....
// Using an instance of A as an interface, it is possible
// to invoke its methods and to modify its field
// without being aware of class A !!!
A* a = new A;
IlvDvInterface* interf = a;
// First we invoke its methods:
IlvDvValue returnedValue;
interf->callMethod(IlvGetSymbol("SetX"), &returnedValue, 100);
interf->callMethod(IlvGetSymbol("GetX"), &returnedValue);
assert((IlvInt) returnedValue == 100);
// Then, we modify its field directly:
interf->setFieldValue(IlvGetSymbol("X"), 200);
assert((IlvInt)interf->getFieldValue(IlvGetSymbol("X"),
&returnedValue) == 200);
Published date: 05/24/2022
Last modified date: 02/24/2022
