12.1.4 Writer Implementations
Three implementations of the writer object interface are provided as
examples by this module. Most applications will need to derive new
writer classes from the NullWriter class.
A writer which only provides the interface definition; no actions are
taken on any methods. This should be the base class for all writers
which do not need to inherit any implementation methods.
A writer which can be used in debugging formatters, but not much
else. Each method simply announces itself by printing its name and
arguments on standard output.
Simple writer class which writes output on the file object passed in
as file or, if file is omitted, on standard output. The
output is simply word-wrapped to the number of columns specified by
maxcol. This class is suitable for reflowing a sequence of
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