Here is a list of all related documentation pages:

Porting from the 1.2 to 2.0 series of c++-gtk-utils
Namespace Cgu
Memory allocation
GTK versions
Callbacks with C linkage
Using GVariant as an opaque data type
Writing multi-threaded programs using c++-gtk-utils
Using c++-gtk-utils with GtkBuilder
Using c++-gtk-utils with Qt
Compiling with clang++
Deprecated List