set_qdata_full

Description:

public void set_qdata_full (Quark quark, void* data, DestroyNotify destroy)

This function works like set_qdata, but in addition, a `void (*destroy) (gpointer)` function may be specified which is called with data as argument when the this is finalized, or the data is being overwritten by a call to set_qdata with the same quark.

Parameters:

this	the ParamSpec to set store a user data pointer
quark	a Quark, naming the user data pointer
data	an opaque user data pointer
destroy	function to invoke with `data` as argument, when `data` needs to be freed