Re: Dispatch function (for function overloading) does not use typemap s

On Nov 27, 2003, at 3:50 AM, Sluis, Minto van der wrote:

> Hi,
>
> I use swig 1.3.19 to create a Tcl wrapper for my C++ libaries.
>
> However When I combine overloaded functions and typemaps the wrapper 
> does
> not work properly. I am not sure whether this is bug or not.
>
> I have a C++ class to represent an ID (sample code snippet follows 
> below).
> Typemaps convert references to this class to plain strings in Tcl. The
> typemaps I use are pretty straight forward.
>
> %typemap(in) ID {
>     $1 = ID(Tcl_GetStringFromObj($input,NULL));
> }
>
> %typemap(in) const ID & (ID temp) {
>     temp = ID(Tcl_GetStringFromObj($input,NULL));
>     $1 = &temp;
> }

[ snip ]

If you are going to use typemaps and overloading together, you need to 
be aware that there is an additional typemap that is used to perform 
the typechecking needed during dispatch.   In the case of the example 
above, you can probably insert something like this into your program:

%typecheck(SWIG_TYPECHECK_STRING) ID, ID & = char *;

Take a look at the file Lib/tcl/tcl8.swg for more examples of using 
%typecheck.

This doesn't appear to be documented very well (if at all) in 1.3.19.  
I'm going to take a look at the pending 1.3.20 release to make sure 
this is described.

Cheers,
Dave

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