Re: [pygccxml-development] Template type instances as default values

[Roman Y. <rom...@gm...>]

On Sat, Mar 29, 2008 at 9:28 PM, Matthias Baas <mat...@gm...> wrote:
> Hi,

Hello

>  I have a problem wrapping a template class whose member functions have
>  default values that are objects of a template type... well, what I mean
>  is best shown on an example:
>
>  class A
>  {
>      public:
>      int v;
>  };
>
>  template<class T>
>  class B
>  {
>      T value;
>      public:
>      B(T a=T()) : value(a) {}
>
>      void foo(T a=T()) {}
>  };
>
>  inline void instantiation()
>  {
>      B<A> b;
>  }
>
>
>  When I create bindings for classes A and B, Py++ produces source code
>  that doesn't compile.
>  The problem is the default value in the constructor of B and the foo()
>  method. The values are instances of template class T which should be A
>  in the above example. But Py++ actually writes "T()" into the source
>  code which, of course, is not declared and produces a compile error.
>  I suppose in a case like this Py++ should recognize that the expression
>  for the default value uses a template type and replace it with the
>  actual type that was used in the instantiation.
>  I don't know if this is easy to do, but I could imagine that it is not
>  quite trivial...
>
>  So what do you think, could Py++ handle this all alone or do I have to
>  replace the default value myself somehow?

Py++ couldn't handle this :-(. I suggest you to read this
thread(http://www.gccxml.org/pipermail/gccxml/2008-February/001059.html).

-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/