shadowing-import

ToC

Allegro CL

ANSI Common Lisp

11 Packages

11.2 Dictionary of Packages

11.2.10 shadowing-import

Function

Syntax:

shadowing-import symbols &optional package

Arguments and Values:

symbols - a designator for a list of symbols.

package - a package designator. The default is the current package.

Description:

shadowing-import is like import, but it does not signal an error even if the importation of a symbol would shadow some symbol already accessible in package.

shadowing-import inserts each of symbols into package as an internal symbol, regardless of whether another symbol of the same name is shadowed by this action. If a different symbol of the same name is already present in package, that symbol is first uninterned from package. The new symbol is added to package's shadowing-symbols list.

shadowing-import does name-conflict checking to the extent that it checks whether a distinct existing symbol with the same name is accessible; if so, it is shadowed by the new symbol, which implies that it must be uninterned if it was present in package.

Examples:

 (in-package "COMMON-LISP-USER")  #<PACKAGE "COMMON-LISP-USER">
 (setq sym (intern "CONFLICT"))   CONFLICT
 (intern "CONFLICT" (make-package 'temp))   TEMP::CONFLICT, NIL
 (package-shadowing-symbols 'temp)   NIL
 (shadowing-import sym 'temp)   T 
 (package-shadowing-symbols 'temp)  (CONFLICT)

Side Effects:

shadowing-import changes the state of the package system in such a way that the consistency rules do not hold across the change.

package's shadowing-symbols list is modified.

Affected By:

Current state of the package system.

See Also:

import, unintern, package-shadowing-symbols

Allegro CL Implementation Details:

None.