Front page | perl.perl6.language |
Postings from March 2005
Dave Whipp wrote:
> Does defining the invocant as "Num @self is constant" constrain the application
> of the role to read-only uses of indices?
I don't think you need "is constant". arguments are readonly by default,
unless you give them the "is rw" trait. I guess that "is constant" means
that you can specify the index only using a literal, not a variable, eg:
@test[1]; # ok, 1 is a costant
my $idx = 1;
@test[$idx]; # nok, $idx is not a constant
but I may be wrong.
> Does the explicit indexing by an "int" typed value ensure that
> it'll be non-recursive under MMD?
you mean "Num" typed value? if so, I guess using an explicitly
non-integer index would make it win under MMD. on the other hand, your
method could even not be called at all with an integer index.
> If I later decare a sub as
>
> sub foo ( @in does LinearInterpolation ) { ... }
>
> Would I be able to pass a normal (non-interpolating) array to this sub,
> and then access it using non-integer indices (i.e. is the data in the
> array independent of the interface through wich it is accessed).
I don't think so. I'm afraid you have to do something like:
sub foo (@in) {
my @_in = @in;
if(! @in.does(LinearInterpolation) ) {
@_in does LinearInterpolation;
}
# go ahead using @_in
...
}
cheers,
Aldo
Thread Previous
|
Thread Next