User info in each object
User info in each object. An object of this class is stored in each \ref{NstTree} object. This allows to store user information in each object.
If this pointer is not NULL, the function custom_unparse is called
instead of the usual unparse function of the object. This allows the user
to completely customize its output.
int user1
int user2
int user3
void* info
(*custom_unparse)(ostream& s, const NstTree& t)
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