Description A GCache allows sharing of complex data structures, in order to save system resources. GTK+ uses caches for GtkStyles and GdkGCs. These consume a lot of resources, so a GCache is used to see if a GtkStyle or GdkGC with the required properties already exists. If it does, then the existing object is used instead of creating a new one. GCache uses keys and values. A GCache key describes the properties of a particular resource. A GCache value is the actual resource.