Re: [Swig-user] Applying typemaps "on demand"

[Marcelo M. <mm...@ac...>]

Yes, grab the last cvs version and do

%extend  {

void each() {
 static swig_type_info *desc =3D SWIG_TypeQuery(#ELEM " *");
 MyList<ELEM>::ConstIterator i;
 for (i=3Dself->begin(); i!=3Dself->end(); ++i)
    rb_yield(SWIG_NewPointerObj((void *) &(*i), desc, 0));
  }

}

nerochiaro wrote:

>Hello,
>I'm rather new to SWIG and trying to write Ruby bindings for a C++ libra=
ry.
>I have a std::vector-like template class that I have successfully
>wrapped so far.
>The only problem comes when I try to extend it to create a function
>that implements the typical "each" ruby iterator method. For non-ruby
>programmers, what it does is to iterate across all elements of the
>vector and call the ruby API function rb_yield(item) for each one.
>The problem lies in the fact that rb_yield expects a ruby object as
>input parameter (type VALUE).
>The following code works, but has a problem (see below):
>
>template <class ELEM> class MyList
>{
>public:
>	%extend {
>		void each() {
>			MyList<ELEM>::ConstIterator i;
>			for (i=3Dself->begin(); i!=3Dself->end(); ++i)
>					rb_yield(SWIG_NewPointerObj((void *) &(*i), $descriptor(ELEM *), 0)=
);
>		}
>	}
>}
>
>The problem is that if there are typemaps defined for the ELEM type
>they won't get applied by SWIG_NewPointerObj.
>=09
>I could simply provide a different implementation of each() for any
>specialization that have a typemap defined for, but that gets old very
>fast and kind of misses the point of using templates in the first
>place.
>
>So I was wondering if there was a more elegant (=3D=3D automated) way to=
 do it.
>What I'm looking for is something that works like SWIG_NewPointerObj
>but that also applies typemaps.
>Does something like that exist ? If not, can anyone suggest alternatives=
 ?
>
>Thanks in advance.
>
>
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