Note that although a value of 0 from
also indicates the beginning of a line, there are cases where
can be meaningfully implemented and
cannot. For example, for a window using variable-width characters the column number is not very meaningful, whereas the beginning of a line has a clear meaning.
The default method for
. Therefore, if this is defined to return
, a method should be provided for either
LispWorks User Guide and Reference Manual - 21 Dec 2011