A class that should be included in stream classes for character input.
fundamental-character-input-stream provides default methods for generic functions used for character input, and should therefore be included by stream classes concerned with character input. The user can provide methods for these generic functions specialized on the user-defined class. Methods for other generic functions must be provided by the user.
There is an example in 24.2.1 Defining a new stream class.
LispWorks® User Guide and Reference Manual - 01 Dec 2021 19:31:01