From: "Gonzalo Garramuño" <ggarra@...>
Date: 2007-12-27T17:14:12+09:00
Subject: Re: C++ Functors and Ruby extensions

Gonzalo Garramu�o wrote:
> Jason Roelofs wrote:
>>
>>
>> SWIG does not handle nested classes, a *serious* defect to what I'm 
>> trying to do. 
> 
> Which is partially not true.  SWIG supports nested classes just fine but 
> you need to provide more glue code to expose the class as the swig 
> *parser* will not automatically parse them for you.  The amount of code 
> you need to write is probably less than the equivalent of boost python.
> 
> Here's a simple dummy example.

Actually, just looking at the swig internals, the typedef is unneeded 
and the code can be simplified to just:

%module nested

// this is what's in your .h file
%inline {

   class A
   {
   public:
     A()  {}
     ~A() {}

     class B
     {
     public:
       B()  {}
       ~B() {}
     };

   };

}

// We rename the nested class to something valid
%rename("A__B") A::B;

// the glue code--- we copy the B definition here and call it A::B
class A::B
{
public:
   B()  {}
   ~B() {}
};

%init {
   // we define a constant inside A so we can invoke A::B.new()
   rb_define_const(cA.klass, "B", cA__B.klass );
  }


-- 
Gonzalo Garramu�o
ggarra@advancedsl.com.ar

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