[Swig-user] What does "SWIGTYPE NOINSTANCE" mean?

[<5k...@in...>]

Hi everyone,

I work on a program that uses swig (which I know nearly nothing of),
namely CDG[1]. When we want to compile the program, we get the following
error:

| cdgtypemaps.i:34: Error: Can't copy typemap (out) SWIGTYPE NOINSTANCE = SWIGTYPE

When running make the second time, everything works fine. With really
old versions of swig, this error doesn't occur.

If I remove the following line 

| %typemap(out) SWIGTYPE = SWIGTYPE NOINSTANCE;

everything works fine on the first run. My only problem is: I really
don't know what this line means, only that it's from 2003 and should
"enable compilation with swig >1.3.x" according to the commit
message.

So, what does this line do? I was unable to find information about this.


For completeness, I've quoted the whole file below:

| typedef double Number;
| 
| #ifdef SWIGPERL5
| %typemap(in) SWIGTYPE *, SWIGTYPE [], SWIGTYPE & { 
|   SWIG_ConvertPtr($input, (void **) &$1, $1_descriptor, 0);
|   /* ignore type check */
| };
| #endif
| 
| #ifdef SWIGTCL
| %typemap(in) SWIGTYPE *, SWIGTYPE &, SWIGTYPE [] {
| /* ignore type check */
| #ifdef OLD_SWIG
|   SWIG_ConvertPtr(interp, $input, (void **) &$1, $1_descriptor, $disown);
| #else
|   SWIG_ConvertPtr($input, (void **) &$1, $1_descriptor, $disown);
| #endif
| };
| 
| %typemap(out) SWIGTYPE = SWIGTYPE NOINSTANCE;
| 
| #endif

Greetings,
  Arne

[1]: https://nats-www.informatik.uni-hamburg.de/view/CDG/WebHome