Signal/slot paradigm in graphics code, libsigc++ dependency

[John W. Eaton]

On 28-Aug-2008, Michael Goffioul wrote:

| I was thinking about implementing a more formal signal/slot paradigm in
| the graphics code to take care of the property/object listeners and builtin
| updaters. While trying to figure the implementation specs, I remembered
| of the libsigc++ library that already provides such complete framework.
| 
| I didn't check everything, but I think it provides everything I'd need. So 
would
| it be acceptable to use it within octave, adding (yet) another dependency?

I don't object to the additional dependency, but can you briefly
explain what this library provides and how it helps?

Also, the license appears to be LGPL v2 (original, 1991 version, and
that version only).  I think that is OK provided that we only want to
link with the library.

Thanks,

jwe