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Showing content from http://www.lispworks.com/documentation/lw70/CLHS/Body/f_mk_syn.htm below:

CLHS: Function MAKE-SYNONYM-STREAM

Syntax:

make-synonym-stream symbol => synonym-stream

Arguments and Values:

symbol---a symbol that names a dynamic variable.

synonym-stream---a synonym stream.

Description:

Returns a synonym stream whose synonym stream symbol is symbol.

Examples:

 (setq a-stream (make-string-input-stream "a-stream")
        b-stream (make-string-input-stream "b-stream"))
=>  #<String Input Stream> 
 (setq s-stream (make-synonym-stream 'c-stream))
=>  #<SYNONYM-STREAM for C-STREAM> 
 (setq c-stream a-stream)
=>  #<String Input Stream> 
 (read s-stream) =>  A-STREAM
 (setq c-stream b-stream)
=>  #<String Input Stream> 
 (read s-stream) =>  B-STREAM

Side Effects: None.

Affected By: None.

Exceptional Situations:

Should signal type-error if its argument is not a symbol.

See Also:

Section 21.1 (Stream Concepts)

Notes: None.

• STREAM-ACCESS:ADD-TYPES-ACCESSORS

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