[Coin-discuss] C# interface to OSI (CLP)

[Laszlo Ladanyi]

There aren't that many places to change, so it's not a big change. It can even
be done with a 'typedef int BOOL_RETURN_TYPE;' fashion, so on other
platforms/compilers we could stick to bool. When VC++6 was the dominant, we
had a similar problem: it did not support templated member functions, while
VC++7 did. So in most of COIN there are no templeted member functions. Also,
while you may be able to apply a hotfix/service pack, others (esp. in
industry) may not have that luxury. The bigger a company the more throughly
they test each patch before allowing employees to apply them. So even if SP1
is really released in April and if VS2005 is correct, many COIN users may be
stuck with this bug for quite a bit longer.

Of course, the easiest for us is just to phrase your post in a FAQ item, so if
someone is in the same situation they'd find the answer easier :-).

--Laci

On Sat, 18 Mar 2006, Jan-Willem Goossens wrote:

> Hi Laszlo,
> 
> Well, I dont know. Changing the COIN sources (a lot) to work around a known 
> MS bug doesnt feel right to me, even as a windows user.. According to
> 
> http://support.microsoft.com/default.aspx?scid=kb;en-us;823071
> 
> MS identified the problem, made a hotfix for VS2003, but hasnt gotten around 
> to releasing an official service pack for VS2003. ("VS 2003 SP1 is scheduled 
> for April 2006.  We have done much of the work for this release already, and 
> are anxious to get it to you.")
> 
> I also read that supposedly this has been fixed in VisualStudio 2005. I'll 
> try to get around to testing that on monday.
> 
> Since I'm using CLP through OSI, and there are only about half a dozen OSI 
> functions that return a boolean, I didnt have to use the workaround a lot.
> 
> On a different note: wouldnt it be nice to be able to Search through the 
> COIN mailing lists archives? It took me some time to find my own post back..
> 
> Regards,
> 
> Jan-Willem
> 
> ----- Original Message ----- 
> From: "Laszlo Ladanyi" <ladanyi at us.ibm.com>
> To: "Discussions about open source software for Operations Research" 
> <coin-discuss at list.coin-or.org>
> Sent: Saturday, March 18, 2006 18:23
> Subject: Re: [Coin-discuss] C# interface to OSI (CLP)
> 
> 
> Hi Jan-Willem,
> 
> Another option is never to return a bool, always return an int instead (0 
> for
> false, 1 for true). Only the method definitions need to be changed, not the
> code, since int can be auto-converted to bool. The libraries probably would
> not suffer an enormous performance loss :-).
> 
> Could you try to modify a virtual bool method to be an int and see whether 
> it
> works? If so we can do the change everywhere. I guess Windows is an 
> important
> enough platform to try to work around compiler quirks...
> 
> --Laci
> 
> On Sat, 18 Mar 2006, Jan-Willem Goossens wrote:
> 
> > Hi,
> >
> > I'm using CLP (via Osi) in .NET, for example C#, as well.
> > What I did was to make a .NET managed C++ DLL that interfaces between the
> > classic C++ used in the COIN sources, and the managed .NET world.
> > Once that's done, you can use this .NET DLL as a normal .NET Reference, 
> > for
> > example in a C# of VN.NET solution.
> >
> > Just be aware of the "virtual bool bug"  that I posted on
> > http://list.coin-or.org/pipermail/coin-discuss/2005-October/001677.html
> >
> >
> > Good luck,
> >
> > Jan-Willem
> >
> >
> >
> >
> >
> > ----- Original Message ----- 
> > From: "Leo Lopes" <leo at sie.arizona.edu>
> > To: "Discussions about open source software for Operations Research"
> > <coin-discuss at list.coin-or.org>
> > Sent: Friday, March 17, 2006 17:59
> > Subject: Re: [Coin-discuss] C# interface to OSI (CLP)
> >
> >
> > How hard is it to create a .net library from a Visual C++ project?
> > That seems like the easiest way.
> >
> > On 3/17/06, allmail <allmail at michalkaut.net> wrote:
> > > Hello,
> > >
> > > we want to use CLP in a project that is written in C#.
> > > Is there some C# interface to OSI?
> > > Or, if not, does anyone have any experiences/ideas with calling OSI from
> > > C#?
> > >
> > > Thanks a lot in advance.
> > >
> > > Regards,
> > > Michal Kaut
> > >
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> >
> >
> > --
> > ========================================================================
> > Leonardo B. Lopes                                    leo at sie.arizona.edu
> > Assistant Professor                                        (520)621-2342
> > SIE - University of Arizona  http://www.sie.arizona.edu/faculty/leolopes
> >
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