It looks like you have spaces in the token { * } can you try it without,
using this {*} instead?
On Mon, Jun 29, 2020, 1:29 PM Richard Hainsworth <rnhainswo...@gmail.com>
wrote:
> I have several multi methods.
>
> All of them have the same first statement, then differ depending on the
> signature.
>
> proto seems to be a way to factor out the common statement, and there is a
> phrase in the Documentation that * can affect the dispatch, viz:
>
> "You can give the proto a function body, and place the {*} where you want
> the dispatch to be done. This can be useful when you have a "hole" in your
> routine that gives it different behavior depending on the arguments given:"
>
> The docs give and example proto, but unfortunately, not how this works
> with other multi's.
>
> So I tried this:
>
> class NewClass {
> has $.debug is rw = False;
> has $.value is rw = 'Initial value';
>
> proto method handle( |c ) {
> note "value is $.value" if $.debug;
> { * } }
> multi method handle(Str $s) {
> $.value = $s;
> say 'in string' }
> multi method handle(Positional @s) {
> $.value = @s[0];
> say 'in positional' }
> }
> my NewClass $x .= new;
> $x.handle('hello world');$x.handle(<hello world>);$x.debug =
> True;$x.handle('hello world');$x.handle(<hello world>);
>
> #raku test.raku
> #value is Initial value
> #value is Initial value
>
> I am wondering how to use proto and {*}
>
>
