Re: compiler not enforcing const rules

"Bo Persson" <>
18 Jan 2007 16:54:45 -0500
kwijibo28 wrote:

Hi everyone,

I've got this piece of code which compile fine on my compiler but
I'm sure it shouldn't.
As you can see in the main() function I'm calling the const member
function TestB. And this function call TestA. But TestA is NOT a
const member function so the compiler should return error?

Am I missing somehing here?

Yes, that the A used is not a member of B.

By the way I'm using .NET 2003.


class A
   virtual ~A();
   virtual void TestA() = 0;
   int m_a;

class ChildA : public A
   ChildA() {m_a = 0;}
   void TestA() {m_a = 1;}

class B
   B() {a = new ChildA;}
   ~B() {delete a;}
   void TestB() const {a->TestA();}
   A * a;

Here a points to a ChildA which is not const. If it were, it would be "A
const* a".

So, TestB() being const says that it cannot modify the B object it is a
member of. It doesn't say that it cannot modify other non-const objects.

Bo Persson

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