Hello Andreas,
On 10/03/2011 12:13 AM, Andreas Halm wrote:
>> true, once the conversion to boost::function has happened there is not
>> enough type information left to do the comparison. However, the return
>> value from a boost::bind() (before being converted to boost::function) has
>> enough information, so internally we use that to remove functors, e.g.
> from
>> OSGVisitSubTree.cpp:
>>
>> value->addChangedFunctor(
>> boost::bind(&VisitSubTree::rootChanged, this, _1, _2, _3),
>> "");
>>
>> value->subChangedFunctor(
>> boost::bind(&VisitSubTree::rootChanged, this, _1, _2, _3));
>
> *facepalm*
>
> Of course I tried the two-line-approach
>
> OSG::ChangedFunctor objCB = boost::bind(&classname::destinationChanged,
> this, _1, _2);
> pObj->subChangedFunctor(objCB);
>
> Which can't work then. I also overlooked the subChangedFunctor is templated.
> Plus, searching the OpenSG source code did not return any use of
> subChangedFunctor - I don't understand how that could have happened.
>
> Anyway, I still don't really understand how that function can work, since
> the needed information should be lost during add, so it should not be
> possible to find it again.
hmm, I haven't actually looked at the implementation, but the FAQ you
linked to they mention that the problem when comparing two
boost::function objects is which operator== to use. In the
subChangedFunctor() call above on side has not been converted to
boost::function yet - it's still the result of boost::bind - which
probably carries enough type information to decide which operator== to
use. Sorry, I'm somewhat guessing this, it does seem to work though ;)
Cheers,
Carsten
------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2dcopy1
_______________________________________________
Opensg-users mailing list
Opensg-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/opensg-users
