[gstreamer-bugs] [Bug 518934] Facilitating wrapping of GstTagList by glibmm

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gstreamer (core) | Ver: HEAD CVS




------- Comment #3 from José Alburquerque  2008-02-27 00:11 UTC -------
Thanks for your attention.  I will definitely pay attention to appropriately
submitting patches when I do.  I'll elaborate below as to why I'm requesting
this change:

To generate the C++ API, we run source files (*.hg and *.ccg) files through a
glibmm script called gmmproc which then generates the *.h and *.cc files for
the wrapper library.  In this case, the source files TagList.hg and TagList.ccg
are processed to produce TagList.h and TagList.cc.

Presently, gmmproc assumes that structs are declared in the header files as
"typedef struct _ExampleStructure ExampleStructure" and thus in this case it
inserts the following lines at the top of the generated header files:

#ifndef DOXYGEN_SHOULD_SKIP_THIS
extern "C" { typedef struct _GstTagList GstTagList; }
#endif

This produces a type mismatch compilation error.  gmmproc has been pre-written
and it is really a fine helper and I don't see how it can be changed to work on
a case by case basis so I thought that this change might be easy to do for
gstreamer.

To get a sense of what I'm explaining please see the Unable to predeclare
structs in the Problems in C API section
(http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/aphs06.html) of
Appendix H (http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/aph.html) of
the Programming with gtkmm online book
(http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/index.html).

If this is acceptable, it would be a great help in this gstreamermm wrapping
process of your fine software.  Many C++ programmers will benefit and be
thankful. :-)

With your permission, I'm also attaching a more appropriate patch.  I hope I've
answered your questions.


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