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ANSI Common Lisp  11 Packages 11.2 Dictionary of Packages
| 11.2.18 use-package |
Function |
- Syntax:
-
use-package
packages-to-use &optional package
 t
- Arguments and Values:
-
packages-to-use - a designator for
a list of package designators.
The keyword package may not be supplied.
package - a package designator.
The default is the current package.
The package cannot be the keyword package.
- Description:
-
use-package causes package to inherit all the
external symbols of packages-to-use.
The inherited symbols become accessible as
internal symbols of package.
Packages-to-use are added to the use list of package
if they are not there already. All external symbols in
packages-to-use become accessible in package
as internal symbols.
use-package does not cause any new symbols to be present
in package but only makes them accessible by inheritance.
use-package checks for
name conflicts between the newly imported symbols and those already
accessible in package.
A name conflict in use-package
between two external symbols inherited
by package from packages-to-use may be resolved in favor of
either symbol
by importing one of them into package and making it a
shadowing symbol.
- Examples:
-
(export (intern "LAND-FILL" (make-package 'trash)) 'trash) T
(find-symbol "LAND-FILL" (make-package 'temp)) NIL, NIL
(package-use-list 'temp) (#<PACKAGE "TEMP">)
(use-package 'trash 'temp) T
(package-use-list 'temp) (#<PACKAGE "TEMP"> #<PACKAGE "TRASH">)
(find-symbol "LAND-FILL" 'temp) TRASH:LAND-FILL, :INHERITED
- Side Effects:
-
The use list of package may be modified.
- See Also:
-
unuse-package,
package-use-list,
Section 11.1 Package Concepts
- Notes:
-
It is permissible for a package P1
to use a package P2
even if P2 already uses P1.
The using of packages is not transitive,
so no problem results from the apparent circularity.
- Allegro CL Implementation Details:
-
None.
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