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[REBOL] vargs function (or "r-expression)

From: tim-johnsons::web::com at: 6-May-2007 17:14

Hello Rebolers: NOTE: 'vargs is a "C" term where variable arguments are used and "r-expression" is a take on the lisp term: "s-expression". In lisp, you can have variable argument lists and the function call will be coded something like: (func arg1 arg2 arg3) I have a need for an "r-expression", that is - a class of functions that will be evaluated by 'do as part of a block and can have 0 or more arguments. example: do [vargs "two" 3] do [vargs "two" 3 "four"] do [vargs "two" 3 none "four"] do[vargs] I'm starting with this: vargs: func[arg1[string! unset!] arg2[integer! unset!] arg3[string! logic! none! unset!] arg4[string! logic! none! unset!]][ case/all[ value? 'arg1[?? arg1] value? 'arg2[?? arg2] value? 'arg3[?? arg3] value? 'arg4[?? arg4] ] ] This approach can work for me, I think, but I would welcome any comments, observations or caveats. thanks tim -- Tim Johnson <> Palmer, Alaska, USA