Swig C++ ->C# operator problem

[Giorgio S]

I'm porting a big C++ library to either Python and C#.
In Python the wrapping of C++ operators is just some lines of %rename.

But in C#, SWIG does not accept:
     %rename(operator =) *::operator =

(which is basically what I need).

What I do now is:
    %rename(some_dummy_name) *::operator =
and
    %typemap(cscode) ClassName %{ .... }%

for each class (and they are a lot!) and for each operator (=, ==, +,
+=, [], () etc etc).
I could have used SWIGTYPE (instead of ClassName) in %typemap, but
not all classes supports all operators (take for example std::vector).
Is there a better way to make this process automatic?
I'm looking for something which can replace all occurences of one
operator, possibily parameterized by class_name.
Thanks.



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[David Piepgrass]

> I'm porting a big C++ library to either Python and C#.
> In Python the wrapping of C++ operators is just some lines of %rename.
>
> But in C#, SWIG does not accept:
>      %rename(operator =) *::operator =
>
> (which is basically what I need).
>
> What I do now is:
>     %rename(some_dummy_name) *::operator =
> and
>     %typemap(cscode) ClassName %{ .... }%
>
> for each class (and they are a lot!) and for each operator (=, ==, +,
> +=, [], () etc etc).
> I could have used SWIGTYPE (instead of ClassName) in %typemap, but
> not all classes supports all operators (take for example std::vector).
> Is there a better way to make this process automatic?

I don't think there is a better way. In Python it works because SWIG doesn't have to do anything special (e.g. SWIG is not aware what __add__ means), but in C# SWIG would have to transform a non-static member function into a static member function, and it is not programmed to know how to do so. Besides that, it might not understand that "operator =" is a valid C# identifier.

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