[Coin-discuss] C# interface to OSI (CLP)
Jan-Willem Goossens
j.goossens at t75.nl
Mon Mar 20 07:24:28 EST 2006
I tend to agree. Also, it's not very clear to the user when functions that
logically return a simple "true/false", return an integer. However, does
this outweigh Laszlo's points?
My tests show that the problem (virtual) bool bug is indeed fixed in VS2005.
On a similar note, COIN-OR might consider providing .NET interfacing
functionaly, starting with OSI, as a separate project. This is not rocket
science, but it's not that trivial either.
Jan-Willem
> Personally, I'd rather not introduce an ifdef condition for a
> platform-specific problem where the vendor already ackd the problem
> and will ship a fix soon. Just leave the answer in the list and have
> users fix it themselves. But it isn't my project...
>
> Cheers,
> Leo.
>
> On 3/19/06, Jan-Willem Goossens <j.goossens at t75.nl> wrote:
>> Appart from the fact that my VS2003 code would fail to work as-is, I'd
>> say
>> let's give it a try to see how your approach works.
>> Can you change the code and send me a link to a tarball so I can test
>> it? Or
>> can you build with VS2003 yourself?
>>
>> The FAQ approach is a good think to do anyway.
>>
>> 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 21:37
>> Subject: Re: [Coin-discuss] C# interface to OSI (CLP)
>>
>>
>> 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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>
>
> --
> ========================================================================
> 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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