ANSI Common Lisp 11 Packages 11.2 Dictionary of Packages
symbols &optional package
- Arguments and Values:
symbols - a designator for a list of symbols.
package - a package designator.
The default is the current package.
import adds symbol or
symbols to the internals of package, checking for name
conflicts with existing symbols either present in package
or accessible to it. Once the symbols have been
imported, they may be referenced in the importing
package without the use of a package prefix when using the Lisp reader.
A name conflict in import between the
symbol being imported and a symbol inherited from some other package can
be resolved in favor of the
symbol being imported
by making it a shadowing symbol, or in favor
of the symbol already accessible by
not doing the import. A
name conflict in import with a symbol
already present in the
may be resolved by uninterning that symbol, or by not
doing the import.
The imported symbol is
not automatically exported from the current package, but if it is
already present and external, then the fact that it
is external is not changed.
If any symbol to be imported has no home
package (i.e., (symbol-package symbol) nil),
import sets the home package
of the symbol to package.
If the symbol is already present in the importing package,
import has no effect.
(import 'common-lisp::car (make-package 'temp :use nil)) T
(find-symbol "CAR" 'temp) CAR, :INTERNAL
(find-symbol "CDR" 'temp) NIL, NIL
The form (import 'editor:buffer) takes the external symbol named
buffer in the editor package (this symbol was located when the form
was read by the Lisp reader) and adds it to the current package
as an internal symbol. The symbol buffer is then present in
the current package.
- Side Effects:
The package system is modified.
- Affected By:
Current state of the package system.
- Exceptional Situations:
import signals a correctable error of type package-error
if any of the symbols to be imported has the same name
(under string=) as some distinct symbol (under eql)
already accessible in the package, even if the conflict is
with a shadowing symbol of the package.
- See Also:
- Allegro CL Implementation Details: