Source-class {tm} | R Documentation |
A (virtual) class representing a source, e.g., a directory, a connection, et cetera.
Objects can be created by deriving and instantiating subclasses.
DefaultReader
:function
describing a default reader.Encoding
:character
holding the
encoding of the texts delivered by the source.Length
:numeric
denoting the
number of the elements delivered by the source. If the number
cannot be determined in advance it should be set to zero.LoDSupport
:logical
indicating
whether this source supports load on demand.Position
:numeric
indicating
the position in the source.Vectorized
:logical
indicating
the ability for parallel element access.Ingo Feinerer
stepNext
, getElem
, eoi
for
sequential element access, and pGetElem
for parallel
element access.
getSources
to list available sources.