[Gimp-user] procedure overloading in scheme / script-fu
Can you point me to the scheme manual that talks about overloading please. As you are talking about variable numbers of arguments, this article seems to explain how it works: http://www.math.grin.edu/~stone/courses/scheme/readings/variable-arity.xhtml And in your example, by replacing foo2 with foo you end up with a second definition of foo which replaces the first, and then calls itself recursively when used - hence your infinite loop. -- paynekj (via gimpusers.com) ___ gimp-user-list mailing list gimp-user-list@gnome.org https://mail.gnome.org/mailman/listinfo/gimp-user-list
Re: [Gimp-user] procedure overloading in scheme / script-fu
On 12-09-18 06:42 PM, Gary Aitken wrote: I assumed from the scheme manual that procedure-overloading (in the form of different numbers of arguments) was permitted, since, for example, there are two versions of string-number. Scheme is not an OOP language so it does not support procedure overloading. If you look closely, you will see that string-number and number-string can take an optional parameter, a radix to use during the conversion. The optional radix parameter is not currently supported for either string-number or number-string. Code to add support for the radix was supplied to the TinyScheme project and is currently being reviewed so radix support may be added soon to Script-Fu. If you take the following code and run it in the script-fu console, it works; but replacing all occurrances of foo2 with foo gets into an infinite loop (I guess; it never returns, in any case). If you changed all foo2 to foo, then foo continually calls itself and the console will appear to hang. -- Cheers! Kevin. http://www.ve3syb.ca/ |Nerds make the shiny things that distract Owner of Elecraft K2 #2172 | the mouth-breathers, and that's why we're | powerful! #include disclaimer/favourite | --Chris Hardwick ___ gimp-user-list mailing list gimp-user-list@gnome.org https://mail.gnome.org/mailman/listinfo/gimp-user-list
[Gimp-user] procedure overloading in scheme / script-fu
I assumed from the scheme manual that procedure-overloading (in the form of different numbers of arguments) was permitted, since, for example, there are two versions of string-number. However, I can't seem to get it to work. Anything special one needs to do to overload? If you take the following code and run it in the script-fu console, it works; but replacing all occurrances of foo2 with foo gets into an infinite loop (I guess; it never returns, in any case). Is this just a user-error mistake, or is there something different needed to overload a procedure definition? I realize the two arg definition had to appear before the one arg definition which used it; if the order is wrong I get the wrong # args error, which makes sense. (define (foo2 arg1 arg2) (string-append arg1 arg2)) (define (foo arg1) (foo2 arg1 def)) (foo abc) foo2fooabcdef Thanks, Gary ___ gimp-user-list mailing list gimp-user-list@gnome.org https://mail.gnome.org/mailman/listinfo/gimp-user-list
