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 {*}
