Re: Assignment operator

[Maett]

Christian Christmann <plfriko@yahoo.de> wrote:

> Hi,
>
> how do I define an assignment operator which is supposed to copy
> all member attributes of one object to another where both objects are
> given as pointers?
>
> Example:
>
>         CLASS_A *source = new CLASS_A;
>         ....
>         CLASS_A *dst = new CLASS_A;
>         dst = source;

This assigns the *pointers*. What you want is to copy the objects the pointers 
point to.
You must dereference the pointers.
> I want that all attributes of object "source" are also assigned to object
> "dst".
>
> My idea was to define the operator in the header file of class CLASS_A:
>
>         class CLASS_A
>         {
>                 public:
>                         void operator=( const CLASS_A & );
>                 ...
>                 private:
>                         int a;
>                 ...
>         }
>
> And in the source code:
>
>         void CLASS_A::operator=( const CLASS_A &dst )
>         {
>                 a = dst.a;
>         }
>
> However, this doesn't work since the operator is never invoked.
>
> What did I wrong?

Write
        *dst = *source;
Now your operator= should be invoked.

> Thank you
>
>
> Chris

Cheers
Maett