CLHS: Function COPY-SYMBOL

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Function COPY-SYMBOL

Syntax:

copy-symbol symbol `&optional` copy-properties => new-symbol

Arguments and Values:

symbol---a symbol.

copy-properties---a generalized boolean. The default is false.

new-symbol---a fresh, uninterned symbol.

Description:

copy-symbol returns a fresh, uninterned symbol, the name of which is string= to and possibly the same as the name of the given symbol.

If copy-properties is false, the new-symbol is neither bound nor fbound and has a null property list. If copy-properties is true, then the initial value of new-symbol is the value of symbol, the initial function definition of new-symbol is the functional value of symbol, and the property list of new-symbol is a copy[2] of the property list of symbol.

Examples:

     (setq fred 'fred-smith) =>  FRED-SMITH
     (setf (symbol-value fred) 3) =>  3
     (setq fred-clone-1a (copy-symbol fred nil)) =>  #:FRED-SMITH
     (setq fred-clone-1b (copy-symbol fred nil)) =>  #:FRED-SMITH
     (setq fred-clone-2a (copy-symbol fred t))   =>  #:FRED-SMITH
     (setq fred-clone-2b (copy-symbol fred t))   =>  #:FRED-SMITH
     (eq fred fred-clone-1a) =>  false
     (eq fred-clone-1a fred-clone-1b) =>  false
     (eq fred-clone-2a fred-clone-2b) =>  false
     (eq fred-clone-1a fred-clone-2a) =>  false
     (symbol-value fred) =>  3
     (boundp fred-clone-1a) =>  false
     (symbol-value fred-clone-2a) =>  3
     (setf (symbol-value fred-clone-2a) 4) =>  4
     (symbol-value fred) =>  3
     (symbol-value fred-clone-2a) =>  4
     (symbol-value fred-clone-2b) =>  3
     (boundp fred-clone-1a) =>  false
     (setf (symbol-function fred) #'(lambda (x) x)) =>  #<FUNCTION anonymous>
     (fboundp fred) =>  true
     (fboundp fred-clone-1a) =>  false
     (fboundp fred-clone-2a) =>  false

Side Effects: None.

Affected By: None.

Exceptional Situations:

Should signal an error of type type-error if symbol is not a symbol.

See Also:

make-symbol

Notes:

Implementors are encouraged not to copy the string which is the symbol's name unnecessarily. Unless there is a good reason to do so, the normal implementation strategy is for the new-symbol's name to be identical to the given symbol's name.

The following X3J13 cleanup issues, not part of the specification, apply to this section:

- COPY-SYMBOL-COPY-PLIST:COPY-LIST
- COPY-SYMBOL-PRINT-NAME:EQUAL

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