Dave Storrs writes:
> On Fri, Nov 15, 2002 at 11:50:52PM +0200, [EMAIL PROTECTED] wrote:
> > Michael Lazzaro writes:
> > depending on WYW . or the casting may be let to happen in two stages
> > : string -> num -> specific num type ,e.g. uint16
>
> How about if we got adverbial on the problem:
>
> my $str = "0xff";
> my $i = num $str;
> my $i = num $str : uint16;
> my $i = num "1.0_731e3" : float;
> my $i = num "1.0_898_798_798_794e7" : double;
>
> And this makes an interesting corner case:
>
> my $i = num "10_000" : byte; # value too large for 1 byte
>
what I dont understand, is how *syntactically* float and company is
passed to "num" method/subroutine . if num is *just* another
method/subroutine then I would spell your examples like that
> my $str = "0xff";
> my $i = num $str;
> my $i = num $str : "uint16" ; #or "format"=>"uint16"
Ah, but now I see , uint16 *is not a bare word* -- it is class obgect
.. so -- now I see how you examples would work . num can accept a class
object as argument. But then it have to be predeclard . I heard in the
previous discussions that it may happen that to use uint16 and friends
one will have to say "use ..."
so we can have :
class str{
method num(Class $c) { ... }
method num(str $format) { ... }
.....
}
> I can see two ways to handle this--we can have a compile-time warning,
> or we could store it to the smallest type that will hold the value and
> issue a warning.
>
>
> > > (4) -- We want to be able to output numbers to strings according to
> > > specific formatting rules. One way to do this (aside from using
> > > sprintf) is to use sprintf-style formatting strings, perhaps as
> > > properties to tie them to individual instances:
> > >
> > > my int $i = literal "0xff" but as_string('%02x');
>
> Actually, this would be a good reason to have a function called
> "literal" -- if it went both ways. So, I could do this:
>
> print literal(200+55):hex; # == print "0xff";
> print literal("0xff)); # == print 255;
why not str ?
> print str( 200+55 :"format"=>"hex"); # == print "0xff";
> print str("0xff"); # == print 255;
only that here one haveto use "hex" because hex is not a type or class.
>
> --Dks
>
>
arcadi
