The glibmm package is a set of C++ bindings for Glib. It provides non-UI API that is not available in standard C++ and makes it possible for gtkmm to wrap GObject-based APIs.
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Documentation for libsigc++20, includes full API docs
This package contains the full API documentation for libsigc++20.
The glibmm24-help package contains the full API documentation for glibmm24.