Casting class : Casting « Class « Visual C++ .NET

1. Visual C++ .NET
2. Class
3. Casting

Casting class

 
#include "stdafx.h"
using namespace System;

ref class A {};
ref class B : public A {};
ref class C {};

void main()
{
    Object ^v1 = gcnew A();              
    Object ^v2 = gcnew B();           
    Object ^v3 = gcnew C();         

    A ^a1 = gcnew A();               
    A ^a2 = gcnew B();
    A ^a3 = dynamic_cast<A^>(v1);  // downcast
    A ^a4 = dynamic_cast<A^>(v2);  // downcast

    B ^b1 = gcnew B();
    B ^b2 = dynamic_cast<B^>(v2);  // downcast
    B ^b4 = dynamic_cast<B^>(a2);  // downcast
    
    C ^c1 = gcnew C();
    C ^c2 = dynamic_cast<C^>(v1);  // Fails c2 = null. Miss match classes
    C ^c3 = static_cast<C^>(v2);   // c3 has invalid value of type B class
    C ^c4 = safe_cast<C^>(v3);     // downcast

    C ^c5 = (C^)(v3);              // downcast
} 

   
  

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