Hi Ertugrul,
I'm not entirely sure what you mean.
I'm intending on using Ogre for GUI - for which there is the Hogre bindings, but after emailing the DEV about it, I didn't get the impression from his advice that I should be using it for production code.  Here is what he suggested:
"It depends, really. Hogre is good for running Ogre from within Haskell, but it has its limitations. The number one thing people have been struggling with is handling input with hogre - there's Hois (Haskell wrapper for OIS) but it's not perfect (it misses input events), and the other option is having to write some C++ glue. Hogre is a solid proof of concept and you can do some demos with it, but if you're e.g. writing a game it might be a bit of a struggle. In the end it's about how much you value being able to write code in Haskell (or how allergic to C++ you are)."
I'm on iOS so I imagine those difficulties are compounded.
I am using several other C++ libraries for which there are no existing bindings and no Haskell alternative packages that are even remotely close.
Are you suggesting it would be better to write all my own FFI bindings for all the needed libraries?
Everything I read suggests that Haskells strengths are in transformation and that interaction is not its strong suit.
I am interested in your thoughts and I am open to whatever, but you are the first to suggest that the mix is a bad idea.
Thanks,
Casey

>> I'm working on a project in Haskell and C++ where the former is the
>> brains and the latter is for UI, interaction etc.

>That's a rather odd choice.  Not exactly answering your question, but
>questioning your project decisions, why would you do UI and interaction
>in C++?  You have the necessary Haskell bindings and libraries to write
>everything cleanly in Haskell.
>
>
>Greets,
>Ertugrul