Front page | perl.perl5.porters |
Postings from July 2001
01-07-20 02.35, skrev schwern@pobox.com på schwern@pobox.com följande:
>
>> |> clamp() unfortunately violates this. You have to put all your keys in
>> |> the hash before clamping it, so there's effectively no way to
>> |> distinguish between a valid key which has not been set yet and a valid
>> |> key which is set to undef
>>
>> exists()
>
> Here's the problem. How can I have a clamped keyset of 'foo' and
> 'bar' where C<exists $clamped_hash{foo}> is false?
Is this realy a problem, a clamped keyset is all keys in the set, if foo is
in the set it will return true on exists, otherwise false. What you want to
do is to have a prototype for a hash with the keys, that is much slower
since we have to compare against that prototype, and that is the same has
dealing with pseudohashes.
--
Arthur
Thread Previous
|
Thread Next