libsigc++: libsigc++ (Typesafe callback system for C++)
libsigc++: 
libsigc++: Libsigc++ implements a typesafe callback system for standard C++. It
libsigc++: allows you to define signals and to connect those signals to any
libsigc++: callback function, either global or a member function, regardless of
libsigc++: whether it is static or virtual. It also contains adaptor classes for
libsigc++: connection of dissimilar callbacks and has an ease of use unmatched
libsigc++: by other C++ callback libraries. Libsigc++ is licensed under the GNU
libsigc++: Library General Public License, LGPL.
libsigc++: 
libsigc++: