Returns a BSON reader that returns the result of applying f
on the result of this reader.
Returns a BSON reader that returns the result of applying f
on the result of this reader.
the function to apply
Tries to produce an instance of T from the bson value, returns None if an error occurred.
Tries to produce an instance of T from the bson value.
A reader that produces an instance of
Tfrom a subtype of BSONValue.