Returns a BSONReader that returns the result of applying f
on the result of this reader.
Returns a BSONReader 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,
returns None
if an error occurred.
Tries to produce an instance of T
from the bson
value.
Tries to produce an instance of T
from the bson
value.
Widen this read for compatible type U
.
Widen this read for compatible type U
.