From: Robert Klemme <shortcutter@...>
Date: 2007-12-28T07:19:59+09:00
Subject: Re: C++ Functors and Ruby extensions

On 27.12.2007 15:46, Jason Roelofs wrote:
> [Note:  parts of this message were removed to make it a legal post.]
> 
> On Dec 27, 2007 7:36 AM, Robert Klemme <shortcutter@googlemail.com> wrote:
> 
>> 2007/12/27, Jason Roelofs <jameskilton@gmail.com>:
>>> SWIG does not handle nested classes, a *serious* defect to what I'm
>> trying
>>> to do. I've looked into helping add this feature, but the amount of work
>>> required makes it more feasible to build a better, Ruby-specific wrapper
>>> system.
>> I'm not too familiar with Boost.  So could you quickly summarize what
>> is it that you expect to gain from creating a Boost Ruby integration?
>>
>> Kind regards
>>
>> robert
>>
>>
>> --
>> use.inject do |as, often| as.you_can - without end
>>
>>
> Boost.Python and luabind are libraries built to make it extremely easy to
> build interfaces into the target language from C++. It's not really about
> integration with Boost, Boost just provides some very, very useful
> constructs and a powerful meta-programming subsystem that makes this library
> feasible in such a strict language. Here's what you're able to do:
> 
> Wrap this:
> 
> class A {
>   public:
>     A();
>     A(int, int);
> 
>     void doSomething();
>     int getSomethingBack();
> };
> 
> Like this:
> 
> class_<A>("A")
>    .def(initialize<int, int>())
>    .def("do_something", &A::doSomething)
>    .def("get_something_back", &A::getSomethingBack);
> 
> and in Ruby
> 
> a1 = A.new
> a = A.new(1,2)
> 
> a.do_something
> a.get_something_back

Thanks for taking the time to explain!  I was not aware that something 
like this is part of Boost.

> For those of you pushing SWIG, trust me, I've spent many, many hours trying
> different ways to make nested classes work in a way that won't require me to
> re-write a full quarter of the headers that I'm trying to wrap (Ogre
> rendering engine, for the record). Nested classes are *not* supported in
> SWIG, there are hacks to make it look so, hacks that do not work all of the
> time.

Kind regards

	robert