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Diffstat (limited to 'third_party/lisp/alexandria/definitions.lisp')
| -rw-r--r-- | third_party/lisp/alexandria/definitions.lisp | 37 |
1 files changed, 0 insertions, 37 deletions
diff --git a/third_party/lisp/alexandria/definitions.lisp b/third_party/lisp/alexandria/definitions.lisp deleted file mode 100644 index 863e1f6962..0000000000 --- a/third_party/lisp/alexandria/definitions.lisp +++ /dev/null @@ -1,37 +0,0 @@ -(in-package :alexandria) - -(defun %reevaluate-constant (name value test) - (if (not (boundp name)) - value - (let ((old (symbol-value name)) - (new value)) - (if (not (constantp name)) - (prog1 new - (cerror "Try to redefine the variable as a constant." - "~@<~S is an already bound non-constant variable ~ - whose value is ~S.~:@>" name old)) - (if (funcall test old new) - old - (restart-case - (error "~@<~S is an already defined constant whose value ~ - ~S is not equal to the provided initial value ~S ~ - under ~S.~:@>" name old new test) - (ignore () - :report "Retain the current value." - old) - (continue () - :report "Try to redefine the constant." - new))))))) - -(defmacro define-constant (name initial-value &key (test ''eql) documentation) - "Ensures that the global variable named by NAME is a constant with a value -that is equal under TEST to the result of evaluating INITIAL-VALUE. TEST is a -/function designator/ that defaults to EQL. If DOCUMENTATION is given, it -becomes the documentation string of the constant. - -Signals an error if NAME is already a bound non-constant variable. - -Signals an error if NAME is already a constant variable whose value is not -equal under TEST to result of evaluating INITIAL-VALUE." - `(defconstant ,name (%reevaluate-constant ',name ,initial-value ,test) - ,@(when documentation `(,documentation)))) |