Client-defined metadata that can be associated with some objects like C4Database. More...
Client-defined metadata that can be associated with some objects like C4Database.
(See c4db_setExtraInfo, c4db_getExtraInfo.) For example, if you have your own "Database" class, you could store a pointer to it in the ExtraInfo of the corresponding C4Database so you can map from it back to your object.
The destructor callback is optional, but gives you a chance to clean up (e.g. release) your own object when the containing C4 object is freed.
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