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 libsigc++: of whether it is static or virtual. libsigc++: libsigc++: libsigc++: libsigc++: libsigc++: