rtti

I've got a little class hierarchy where each class corresponds to a certain TComponent descendent (say base class TDefaultFrobber with descendents TActionFrobber and TMenuItemFrobber, corresponding to TComponent, TCustomAction and TMenuItem, respectively). Now I want a factory (?) function something like this: function CreateFrobber(AComponent: TComponent): IFrobber; begin if AComponent is TCustomAction then Result := TActionFrobber.Create(TCustomAction(AComponent)) else if AComponent is TMenuItem then Result := TMenuItemFrobber.Create(TMenuItem(AComponent)) else Result := TDefaultFrobber

I'm actually trying to use Rtti to implent a generic method invoker. It should work like this: I'll provide the class name, method name, and arguments the invoker will do its work by invoking the specified method of this class So I need the class reference in order to get its Rtti information and seek for the method I want to invoke. Is there any way to do that without implementing a class reference list of the classes I want to be working with? To get the class reference using his name you must use the TRttiContext.FindType function passing the Name of the class and the retrieve the instance

What is runtime type control in C++? Naveen It enables you to identify the dynamic type of a object at run time. For example: class A { virtual ~A(); }; class B : public A { } void f(A* p) { //b will be non-NULL only if dynamic_cast succeeds B* b = dynamic_cast<B*>(p); if(b) //Type of the object is B { } else //type is A { } } int main() { A a; B b; f(&a); f(&b); } It is not just about dynamic_cast, but the entire RTTI is part of it. The best place to learn about RTTI is section 15.4 of the C++ Programming Language by Bjarne Stroustrup sharptooth It's dynamic_cast functionality - your code can

As I understand how RTTI is implemented in various C++ compilers (such as GCC), a pointer to the type_info data is stored in the vtable data of each class. And also as mentioned here , POD type may not have a vtable . But if POD types may not have a vtable then where is the pointer to the type_info stored? I know it is implementation-specific, but it would be better to be aware of a C++ compiler (such as GCC) internals. Nicol Bolas There are two kinds of types (for the purposes of RTTI): polymorphic types and non-polymorphic types. A polymorphic type is a type that has a virtual function, in

I saw one book on C++ mentioning that navigating inheritance hierarchies using static cast is more efficient than using dynamic cast. Example: #include <iostream> #include <typeinfo> using namespace std; class Shape { public: virtual ~Shape() {}; }; class Circle : public Shape {}; class Square : public Shape {}; class Other {}; int main() { Circle c; Shape* s = &c; // Upcast: normal and OK // More explicit but unnecessary: s = static_cast<Shape*>(&c); // (Since upcasting is such a safe and common // operation, the cast becomes cluttering) Circle* cp = 0; Square* sp = 0; // Static Navigation of