Re: [boost] discrete_set class

From: Joel de Guzman (djowel_at_[hidden])
Date: 2002-08-27 19:36:25

----- Original Message ----- 
From: "spamjunk" <spamjunk_at_[hidden]>

> I didn't mean dynamic as in dynamically sized.  I meant dynamic as in
> created at run-time.  But now that I think about it, your method could
> interact with non-constant sets and without creating any extra memory.  I
> will look into it.

I also didn't mean dynamically sized. Bitsets can be fixed in terms
of memory, yet dynamic as in mutable. 

--Joel

> ----- Original Message -----
> From: "Joel de Guzman" <djowel_at_[hidden]>
> To: <boost_at_[hidden]>
> Sent: Tuesday, August 27, 2002 7:52 PM
> Subject: Re: [boost] discrete_set class
> 
> 
> >
> > ----- Original Message -----
> > From: "spamjunk" <spamjunk_at_[hidden]>
> >
> >
> > > Yes, but as I said, sooner or later they would have to interact with
> dynamic
> > > sets and have to be converted to actual sets.
> >
> > Perhaps. But not in my case. And, if I really want to
> > interact with dynamic sets, I'll use a bitset or other
> > forms of dynamic sets instead.
> >
> > --Joel
> >
> > > ----- Original Message -----
> > > From: "Joel de Guzman" <djowel_at_[hidden]>
> > > To: <boost_at_[hidden]>
> > > Sent: Tuesday, August 27, 2002 7:11 PM
> > > Subject: Re: [boost] discrete_set class
> > >
> > >
> > > > ----- Original Message -----
> > > > From: "spamjunk" <spamjunk_at_[hidden]>
> > > >
> > > >
> > > > > They aren't always known at compile-time.  You can create sets
> > > dynamically
> > > > > at run-time, using the constructor.  What SetOf allows you to do is,
> if
> > > all
> > > > > the elements are compile-time constants, create the entire set as a
> > > > > compile-time constant.  You could use the same argument for SetOf,
> but
> > > it
> > > > > would still have to be "converted" to an actual set of bits before
> > > > > interacting with other sets, so you wouldn't actually be saving
> > > anything.
> > > >
> > > > No, on the contrary, you can use expression templates to make static
> > > > sets interact with each other. I have an implementation that can
> > > > conceptually hold 256 elements, can do all the set operations (i.e
> > > > negation, union, intersection, difference and xor). I was hoping your
> > > > set would be like this.
> > > >
> > > > --Joel
> > > >
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