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Carl Shapiro
cmucl
Commits
9fdaa7ca
Commit
9fdaa7ca
authored
34 years ago
by
ram
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Added the REQUIRED-ARGUMENT function for squelching type warnings
about required keyword argument defaults.
parent
45b73335
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code/extensions.lisp
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9fdaa7ca
...
...
@@ -17,7 +17,8 @@
(
export
'
(
letf*
letf
dovector
deletef
indenting-further
file-comment
read-char-no-edit
listen-skip-whitespace
concat-pnames
iterate
once-only
collect
do-anonymous
undefined-value
define-hash-cache
defun-cached
cache-hash-eq
))
required-argument
define-hash-cache
defun-cached
cache-hash-eq
))
(
import
'lisp::whitespace-char-p
)
...
...
@@ -31,6 +32,19 @@
(
defun
undefined-value
()
'%undefined%
)
;;; REQUIRED-ARGUMENT -- Public
;;;
(
proclaim
'
(
ftype
(
function
()
nil
)
required-argument
))
(
defun
required-argument
()
"This function can be used as the default value for keyword arguments that
must be always be supplied. Since it is known by the compiler to never
return, it will avoid any compile-time type warnings that would result from a
default value inconsistent with the declared type. When this function is
called, it signals an error indicating that a required keyword argument was
not supplied. This function is also useful for DEFSTRUCT slot defaults
corresponding to required arguments."
(
error
"A required keyword argument was not supplied."
))
;;; FILE-COMMENT -- Public
;;;
...
...
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