Re: [Swig-devel] [MATLAB] How to manipulate wrappers for constructor?

[William S F. <ws...@fu...>]

On 29 August 2015 at 11:56, Joel Andersson <j.a...@gm...> wrote:
> Hi!
>
> I'm back working on the MATLAB module. Thanks to everybody's help, I think
> we are very close to having an essentially feature complete module. After
> debugging the existing features and writing documentation, we should be
> ready for a code review.
>
> I'm now trying to wrap up the support for multiple modules (lots of cred
> goes to Don Bigler) and clean up the handling of pointers.
>
> An issue I have is that the wrapped constructor of a class is called from
> the constructor of the MATLAB proxy class. That is, when calling the
> constructor, the proxy class has already been created. But, as it works now,
> the wrapped constructor will try to return a new proxy class instance.
>
> Another way to explain it: Currently, the wrapper of the constructor will
> work something like:
>
> foo_proxy = _wrap_new_Foo(constructor_arguments)

I'm pretty sure all the language modules work like this, ie a new
proxy is created for every pointer obtained from C/C++, so it is quite
possible to have multiple proxy classes for one underlying C/C++
object.

> But instead I want the proxy class to look like:
>
> _wrap_new_Foo(foo_proxy, constructor_arguments)
>
> How can I change the wrapping of constructors this way?
>
Not possible atm. What are you planning on doing and how will it work?
It sounds like some fundamental changes to the SWIG runtime.

William