stream-unread-char

Arguments: stream character

Undoes the last call to stream-read-char, as in unread-char. Returns nil. Every subclass of fundamental-character-input-stream must define a method for this function. As with unread-char, only one character may be returned to the builtin stream classes.

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

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Created 2019.8.20.