libsigc++-2.0-dev - 2.12.0-1 main

This library implements a full callback system for use in widget
libraries, abstract interfaces, and general programming. It provides
the ability to connect an abstract callback to a class method,
function, or function object, and contains adaptor classes for the
connection of dissimilar callbacks.
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These are the development files for libsigc++, needed only if you
wish to write software which uses it.