[Swig-user] Fwd: Updates on Template with nested structure

[Build M. <akb...@gm...>]

Forgot to reply to the list instead of the user that answered my question.

---------- Forwarded message ----------
From: Build Master <akb...@gm...>
Date: Fri, May 18, 2012 at 5:31 PM
Subject: Re: [Swig-user] Updates on Template with nested structure
To: David Piepgrass <dpi...@me...>


I attached an example.

Say on Windows,
put the two files under same folder, e.g., "C:\MyTest"

and assume SWIG folder is at "C:\MyTest\SWIG"

Run this command:

SWIG\swig.exe -oMyWrapper_wrap.cxx  -c++ -csharp hello_template.swig

You will see the errors that I posted.

If you comment out all the namespaces in both the .swig file and .h file,
the example works perfectly.

K



On Fri, May 18, 2012 at 4:56 PM, David Piepgrass
<dpi...@me...>wrote:

> What namespace is MyArray in? Try qualifying with that namespace (or
> ::MyArray if no namespace). Also, I noticed the args were “aCustomType
> const &” in one place and “const aCustomType &” in another... better make
> it the same in both places, just in case.****
>
> ****
>
> If you need further help, I suggest you reduce the problem to a simple,
> complete, compilable example that exhibits the problem.****
>
> ** **
>
> *From:* Build Master [mailto:akb...@gm...]
> *Sent:* Friday, May 18, 2012 2:44 PM
> *To:* swi...@li...
> *Subject:* [Swig-user] Updates on Template with nested structure****
>
> ** **
>
> Hello,
>
> Here is an update about my earlier post today (see below the original)
> I've narrowed down the problem.
> My original problem was that the generated C# subclass
> CustomList turned out to be inherited from IDisposal (default) instead of
> its true parent MyArray.
>
> I found that this has nothing to do with the nested Iterator struct, but
> with the fact that
> the C++ class CustomList was defined in nested namespaces like this
>
> namespace Name1
> {
>     namespace Name2
>     {
>            class CustomList : public MyArray<aCustomType, const
> aCustomType&, anotherCustomType, 4>
>            {
>                          ....
>            }
>     }
>
> }
>
> With the namespace, I got these errors
> > 1>HeaderBlob.h(3397) : Warning 401: Nothing known about base class
> > 'MyArray< aCustomType, aCustomType const &, anotherCustomType, 4 >'.
> > Ignored.
> > 1>HeaderBlob.h(3397) : Warning 401: Maybe you forgot to instantiate
> > 'MyArray< aCustomType, aCustomType const &, anotherCustomType,4 >'
> > using %template.
> >
>
> Even after defined this class with namespaces in my SWIG interface like
> this:
> namespace AK
> {
>     namespace SoundEngine
>     {
>         namespace DynamicDialogue
>         {
>             %template(AkPlaylist) Playlist<PlaylistItem, PlaylistItem
> const &, ArrayPoolDefault, 4>;
>         }
>     }
> }
>
> I still got the same errors.
>
> Any help would be appreciated.
>
> K
>
>
> ======================
> Original question
> ======================
> Hello,
>
> I'm generating C# bindings for C++ that need to expose templates.
> Now I'm having errors related to nested structures in template class.
>
> I read from SWIG doc that SWIG has only limited support to nested
> structures.
> I now have to expose a template class that contains a nest struct,
> something looking like this
>
> // MyArray.h
> template <class T, class T1, class T2, unsigned long P> class MyArray {
> public:
>
>     MyArray() ....{}
>
>     struct Iterator
>     {
>            T* pItem;
>            Iterator& operator++() { ... }
>            Iterator& operator--() { ... }
>            .....
>     }
>
>     Iterator Begin() const { ... }
>     Iterator End() const { ... }
>
>     ...
> }
>
>
> Then in my interface I have this statement based on this class:
>
> > %include <MyArray.h>
> > %template(CustomArray) MyArray<aCustomType, aCustomType const &,
> > anotherCustomType, 4>;
> >
> > %include <HeaderBlob.h>
> >
>
> In HeaderBlob.h, I have classes that looks like:
>
> > class CustomList : public MyArray<aCustomType, const aCustomType&,
> > anotherCustomType, 4>
> >
>
>
> When using SWIG to generate bindings, I'm getting these errors:
>
> 1>MyArray.h(84) : Warning 325: Nested struct not currently supported
> > (Iterator ignored)
> > 1>HeaderBlob.h(3397) : Warning 401: Nothing known about base class
> > 'MyArray< aCustomType, aCustomType const &, anotherCustomType, 4 >'.
> > Ignored.
> > 1>HeaderBlob.h(3397) : Warning 401: Maybe you forgot to instantiate
> > 'MyArray< aCustomType, aCustomType const &, anotherCustomType,4 >'
> > using %template.
> >
>
> SWIG generates CustomList, aCustomType C# class and CustomArray C# class
> that have no connections.
>
> Also two orphan types are generated
>
> >
> > SWIGTYPE_p_MyArrayT_aCustomType_aCustomType_const_R_anotherCustomeType
> > _4_t__Iteratorcs
> > SWIGTYPE_p_aCustomType.cs
> >
>
> I wonder if this is due to the nested Iterator struct, or the fact that
> I'm missing some required typemaps or other SWIG constructs??
>
> Regards,
> K****
>