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The defined Gray Stream classes are these:
Class precedence list:
fundamental-stream, standard-object, stream, t
the base class for all Gray streams
Class precedence list:
fundamental-input-stream, fundamental-stream, standard-object, stream, t
a superclass of all Gray input streams
The function input-stream-p will return true of any generalized instance of fundamental-input-stream.
Class precedence list:
fundamental-output-stream, fundamental-stream, standard-object, stream, t
a superclass of all Gray output streams
The function output-stream-p will return true of any generalized instance of fundamental-output-stream.
Class precedence list:
fundamental-binary-stream, fundamental-stream, standard-object, stream, t
a superclass of all Gray streams whose element-type is a subtype of unsigned-byte or signed-byte
Note that instantiable subclasses of fundamental-binary-stream should provide (or inherit) an applicable method for the generic function stream-element-type.
Class precedence list:
fundamental-character-stream, fundamental-stream, standard-object, stream, t
a superclass of all Gray streams whose element-type is a subtype of character
Class precedence list:
fundamental-binary-input-stream, fundamental-input-stream, fundamental-binary-stream, fundamental-stream, standard-object, stream, t
a superclass of all Gray input streams whose element-type is a subtype of unsigned-byte or signed-byte
Class precedence list:
fundamental-binary-output-stream, fundamental-output-stream, fundamental-binary-stream, fundamental-stream, standard-object, stream, t
a superclass of all Gray output streams whose element-type is a subtype of unsigned-byte or signed-byte
Class precedence list:
fundamental-character-input-stream, fundamental-input-stream, fundamental-character-stream, fundamental-stream, standard-object, stream, t
a superclass of all Gray input streams whose element-type is a subtype of character
Class precedence list:
fundamental-character-output-stream, fundamental-output-stream, fundamental-character-stream, fundamental-stream, standard-object, stream, t
a superclass of all Gray output streams whose element-type is a subtype of character