Quoteing (e-mail address removed), on Sun, Nov 14, 2004 at 06:43:32PM +0900:
In message "Re: [DOCBUG] Proc#arity"
|> An inconsistency in the docs for Proc#arity ? Here's what ri says:
|>
|> arguments. A +proc+ with no argument declarations returns -1, as it
|> can accept (and ignore) an arbitrary number of parameters.
| * eval.c (proc_arity): arity is now defined as number of
| parameters that would not be ignored. i.e. Proc.new{}.arity
| returns zero. update test suites too.
And lambda{}.call(1) should have made to raise exception. I will fix
this. Could somebody update the document?
If I understand this correctly, the docs should now say something like
the below?
Cheers,
Sam
Index: eval.c
===================================================================
RCS file: /src/ruby/eval.c,v
retrieving revision 1.616.2.68
diff -u -r1.616.2.68 eval.c
--- eval.c 12 Nov 2004 06:06:12 -0000 1.616.2.68
+++ eval.c 14 Nov 2004 16:26:35 -0000
@@ -8207,15 +8207,14 @@
* call-seq:
* prc.arity -> fixnum
*
- * Returns the number of arguments required by the block. If the block
+ * Returns the number of arguments that would not be ignored. If the block
* is declared to take no arguments, returns 0. If the block is known
* to take exactly n arguments, returns n. If the block has optional
* arguments, return -n-1, where n is the number of mandatory
- * arguments. A <code>proc</code> with no argument declarations
- * returns -1, as it can accept (and ignore) an arbitrary number of
- * parameters.
+ * arguments. A <code>proc</code> with no argument declarations
+ * is handled like a block declaring <code>||</code> as its arguments.
*
- * Proc.new {}.arity #=> -1
+ * Proc.new {}.arity #=> 0
* Proc.new {||}.arity #=> 0
* Proc.new {|a|}.arity #=> 1
* Proc.new {|a,b|}.arity #=> 2
