libsigc++: libsigc++ libsigc++: libsigc++: This library implements a full callback system for use in widget libsigc++: libraries, abstract interfaces, and general programming. Originally libsigc++: part of the GTK-- widget set, libsigc++ is now a separate library to libsigc++: provide for more general use. It is the most complete library of its libsigc++: kind with the ability to connect an abstract callback to a class libsigc++: method, function, or function object. It contains adaptor classes for libsigc++: connection of dissimilar callbacks and has an ease of use unmatched libsigc++: by other C++ callback libraries. libsigc++: