Casts?

  
class Foo
{
public:
   virtual ~Foo()
   {
   }
};

class Bar : public Foo
{
};

class Baz : public Foo
{
};

class Qux
{
};

int main()
{
   Foo* pFoo = new Bar();
   // Related type cast of the actual type.

   Bar* pDynamicBar = dynamic_cast<Bar*>(pFoo); // Safe: Returns pointer to Bar object.

   Bar* pStaticBar = static_cast<Bar*>(pFoo); // Safe: Returns pointer to Bar object.

   Bar* pReinterpretBar = reinterpret_cast<Bar*>(pFoo); // Safe: Returns pointer to Bar object.

   // Related type cast.

   Baz* pDynamicBaz = dynamic_cast<Baz*>(pFoo); // Safe: Returns 0.

   Baz* pStaticBaz = static_cast<Baz*>(pFoo); // Unsafe: Returns pointer to Bar object.

   Baz* pReinterpretBaz = reinterpret_cast<Baz*>(pFoo); // Unsafe: Returns pointer to Bar object.

   // Unrelated type cast.

   Qux* pDynamicQux = dynamic_cast<Qux*>(pFoo); // Safe: Returns 0.

   Qux* pStaticQux = static_cast<Qux*>(pFoo); // Compiler error: cannot convert from ''Foo*'' to ''Qux*''.

   Qux* pReinterpretQux = reinterpret_cast<Qux*>(pFoo); // Unsafe: Returns pointer to Bar object.

}