[Haskell-cafe] Feedback on FFI bindings for C++ library

[Alp Mestanogullari]

The simplest way generally is to make make a C binding and then bind
Haskell from there. You may indeed want to take a look at wxWidgets'
binding or SFML's (https://github.com/jeannekamikaze/SFML).


On Fri, Jan 18, 2013 at 1:05 AM, kudah <kudahkukarek at gmail.com> wrote:

> I'd suggest to first look at how other C++-bindings for haskell are
> implemented. e.g. wxHaskell is the most mature Haskell C++ binding out
> there. hogre tries to generate bindings from headers. And a number of
> (rather minimal) bindings to some libs were made as part of Nikki and
> the Robots.
>
> On Thu, 17 Jan 2013 18:48:02 +0100 Nathan Hüsken
> <nathan.huesken at posteo.de> wrote:
>
> > Hey,
> >
> > I would like to write FII bindings in haskell for cocos2d-x
> > (http://www.cocos2d-x.org/), which is a C++ library.
> >
> > Since I have little experience with this, I would like some feedback
> > before I discover that concept is bad half way.
> >
> > In cocos2d there is a base class with much functionality: CCNode
> > Many classes derive from it (i.E. CCLayer) and use the virtual
> > functions of CCNode (i.E. setPosition).
> >
> > How do I map this to haskell?
> >
> > The general Idea:
> >
> > I have a typeclass, in which everything that is derived from CCNode is
> > an instance:
> >
> >     class NodeDerived a where
> >       toNode :: a -> Node
> >
> >       setPosition :: a -> (Double,Double) -> IO ()
> >       setPosition a pos = setNodePosition (toNode a) pos
> >
> >     instane NodeDerived Layer where
> >       toNode = layerToNode
> >
> > and layerToNode :: Layer -> Node would be implemented in C++ as:
> >
> >     CCNode* layerToNode(CCLayer* l) { return
> > dynamic_cast<CCNode*>(l); }
> >
> > This way I would have only to implement toNode for every class derived
> > from CCNode and get all the functions CCNode defines.
> >
> > What do you think if this Idea?
> > How would you do it?
> >
> > Thanks!
> > Nathan
> >
> > _______________________________________________
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>
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-- 
Alp Mestanogullari
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