stream-line-column

Arguments: stream

This function returns the column number where the next character will be written, or nil if that is not meaningful for stream. The first column on a line is numbered 0. This function is used in the implementation of the pretty printer and the format ~T directive. For every character output stream class that is defined, a method must be defined for this function, although it is permissible for it to always return nil.

Beginning with version 6.1, simple-streams now implement stream-line-column as a part of the standard interface, rather than as a simple call to charpos when the :gray-compat module is loaded. For simple-streams, stream-line-column is setfable. See the discussion of charpos and stream-line-column in Details of stream-line-column and charpos in streams.htm.

See also streams.htm for general information on streams in Allegro CL.

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Created 2015.5.21.