On Tue, Sep 15, 2009 at 1:45 PM, John Peterson
<[email protected]> wrote:
> On Tue, Sep 15, 2009 at 12:19 PM, Derek Gaston <[email protected]> wrote:
>>
>> Could we add a counter to the mesh that says the number of times it's
>> changed? And have that counter get incremented every time one of the
>> Thoughts?
>
> I've thought about doing this before, but unfortunately it's very hard
> to get absolutely correct in the library (at least, without a major
> re-design of the Mesh).
Along these lines: the idea would be to have a
class MeshProxy : public MeshBase
{
virtual void clear ();
// etc...
private:
unsigned _version;
Mesh _actual_mesh;
};
MeshProxy is derived from MeshBase so that it's forced to re-implement
all the right interfaces.
The guts of MeshProxy's non-const functions would look something like this:
void MeshBase::clear ()
{
_version++;
_actual_mesh->clear();
}
So, it bumps the internal version whenever a non-const member (or any
other member you want) is called.
There are definitely problems with this approach, for one, MeshBase is
not a true abstract base class due to those data pointers we were
talking about earlier. But this is the idea I had...
--
John
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