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Postings from March 2005
Aldo Calpini wrote:
> 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
What I was trying to do is to prevent using fractional indices in lvalue
context. I.e. my role wouldn't be considered for "@x[0.5] = 2".
> 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.
That's what I'm hoping. Because my code does integer indexing, and I
wouldn't want it to call itself. I guess could be explicit:
$value = @self.Array::postcircumfix«[]»($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
> ...
> }
I don't see why I need the conditional there. If I'm going to copy the
array, I might as well declare up front the that darget does
LinearInterpolation:
sub foo (Num @raw_in)
{
my Num @in does LinearInterpolation = @raw_in;
...
}
Or perhaps even
sub foo (Num @in is copy does LinearInterpolation)
{
...
}
Dave.
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