Graphics properties as objects

[Michael Goffioul]

On 1/8/08, John W. Eaton <jwe at bevo.che.wisc.edu> wrote:
> On  8-Jan-2008, Michael Goffioul wrote:
>
> | On 1/8/08, John W. Eaton <jwe at bevo.che.wisc.edu> wrote:
> |
> | > I'm surprised to see the property argument above not be a reference or
> | > pointer.  Doesn't this cause a copy to be made when insert_property is
> | > called?
> |
> | It just increases the reference counting of the underlying base_property
> | object.
>
> But won't the count be decremented again when the destructor for the
> local value in the insert_property function is called when the end of
> the function is reached?

Yes, but in the meantime, you'll have another reference stored in the
map. So the internal object will not be deleted.

Michael.