pkgsrc/devel/libsigc++1/DESCR

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