[Cgl] cgl, cpx, mir, error

[Matthew Galati]

> -----Original Message-----
> From: cgl-bounces at list.coin-or.org 
> [mailto:cgl-bounces at list.coin-or.org] On Behalf Of Matthew Galati
> Sent: Sunday, April 15, 2007 7:54 PM
> To: Matthew Saltzman; cgl at list.coin-or.org
> Subject: RE: [Cgl] cgl, cpx, mir, error
> 
> 
> > >> I'll put together a basic empty OSI class this weekend and
> > see how it
> > >> works out with CGL.  I need it for my work anyway.  
> Then, you can 
> > >> choose to include it or no with the current OSI distribution.
> > >
> > > 	Thanks, Matt! This is an idea that deserves a try-out.
> > 
> 
> 
> Here's a first draft. 
>    
> https://coral.ie.lehigh.edu/projects/DECOMP/browser/trunk/Temp
> Fix/OsiNull
> 
> As expected, this brings up a lot of design questions. This 
> probably needs more thought. In particular, do we want this 
> object to manage its own memory? 
> 
> As this is just a "patch" until OSI2 is out, I took the 
> quickest path, which was to use Francois's idea of a data 
> object that just carries const pointers (i.e., OsiData is for 
> the most part, just like CglData). That means, the user is 
> responsible for all memory allocation and freeing. Also, the 
> user must manipulate the data themselves and only pass in 
> pointers (which are const). This means, that many of the Osi 
> methods had to be disabled - like those involving changing 
> the model dynamically. The only non-const members are those 
> needed to make the Cgl generators work. 
> 
> I did not derive all of the pure virtual methods -- just 
> enough to get some of Cgl to work. Methods that "should not 
> be called" from OsiNull will throw an exception/assertion 
> using CoinAssert.
> 
> I have not tested it much - only in the context of my 
> framework. It seems to run fine with CGLs: Knapsack, Flow 
> Cover, Clique and MIRs. It throws an error with Gomory (as expected). 
> 
> For now, it is good enough for my needs -- but, I am not sure 
> how useful it will be to others. Have a look, let me know 
> what you think.
> 
> Matt G

FYI. If you are interested -- this has moved to:
	https://coral.ie.lehigh.edu/projects/DECOMP/browser/trunk/Decomp/src/OsiNullSolverInterface.hpp
      https://coral.ie.lehigh.edu/projects/DECOMP/browser/trunk/Decomp/src/OsiData.hpp