[MOAB-dev] Q on initializing MOAB iMesh interface

[Tim Tautges]

Hmm, good point.  The singletons in CGM don't allow multiple of those to exist, but maybe with a C++ version of iGeom 
multiple ones of those could; or, is this just another form of a multiplexer?

- tim

On 01/08/2011 03:08 PM, Iulian Grindeanu wrote:
> Hello,
> Yes, I think this would be better. It should continue to allow multiple iMesh instances.
>
> Also, iGeom implementation in MOAB should be changed in a similar way.
>
> Currently only one iGeom instance is possible; a similar class is needed, that contains the
> global variables defined in iGeom_MOAB.cpp, and a pointer to Core (or MBiMesh?)
>
> Thanks,
> Iulian
>
> ----- Original Message -----
>> Hi all,
>> Currently in MOAB's iMesh implementation, the class structure looks
>> like:
>>
>> class MBiMesh : public Core
>> {...}
>>
>> It's done this way because the iMesh implementation needs to keep some
>> member data that Core doesn't need. However, it
>> also makes it impossible to construct an iMesh object from an existing
>> Core object. I'd like to change that. What I'd
>> like to do is change MBiMesh from "isA" to "hasA", i.e. to make
>> MBiMesh point to an Interface object. The MBiMesh
>> object would keep track of whether it constructed MOAB or was passed
>> one, so it would know whether it could destroy it
>> in iMesh_dtor. I'd also like to enable the Interface::query_interface
>> method to return an iMesh instance, consistent
>> with other interfaces it already handles. The net effect of all this
>> would that applications could gain access to an
>> iMesh interface on a transient basis, e.g. if they wanted to call a
>> service implemented in iMesh but not MOAB.
>>
>> Does anybody see any problem with this approach, or think I should do
>> it differently?
>>
>> - tim
>>
>> --
>> ================================================================
>> "You will keep in perfect peace him whose mind is
>> steadfast, because he trusts in you." Isaiah 26:3
>>
>> Tim Tautges Argonne National Laboratory
>> (tautges at mcs.anl.gov) (telecommuting from UW-Madison)
>> phone: (608) 263-8485 1500 Engineering Dr.
>> fax: (608) 263-4499 Madison, WI 53706
>

-- 
================================================================
"You will keep in perfect peace him whose mind is
   steadfast, because he trusts in you."               Isaiah 26:3

              Tim Tautges            Argonne National Laboratory
          (tautges at mcs.anl.gov)      (telecommuting from UW-Madison)
          phone: (608) 263-8485      1500 Engineering Dr.
            fax: (608) 263-4499      Madison, WI 53706