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From Gary Gregory <garydgreg...@gmail.com>
Subject Re: ImmutablePair and compareTo()
Date Sun, 26 Mar 2017 05:27:22 GMT
On Fri, Mar 3, 2017 at 8:05 AM, Matt Sicker <boards@gmail.com> wrote:

> So would a further specialization be useful here for an immutable pair of
> immutable objects?



Hi Matt,

But how would you guarantee that aside from using a marker interface to
denote an object as being immutable? Are you talking about specializing for
primitives or known JRE immutables like String and Integer? Curious...

Gary

In my own applications, I tend to embrace immutability
> everywhere (except for certain performance-intensive areas involving byte
> buffers and encoding/decoding), so being able to make assumptions about the
> underlying objects would be nice.
>
> On 3 March 2017 at 09:58, Jörg Schaible <joerg.schaible@bpm-inspire.com>
> wrote:
>
> > Hi Matt,
> >
> > Matt Sicker wrote:
> >
> > > I took a look at this yesterday and forgot to reply. Anyways, I agree
> > that
> > > ImmutablePair should override compareTo() since it can rely on its own
> > > values not changing, whereas the implementation in Pair isn't as crazy
> > > since it's mutable.
> >
> > ImmutablePair is only immutable concerning the referenced objects, it
> > cannot
> > make any assumptions about those objects' immutability.
> >
> > StringBuilder builder = new StringBuilder();
> > ImmutablePair<String, StringBuilder> = new ImmutablePair<>("key",
> builder);
> > builder.append("a");
> >
> > ImmutablePair just guarantees here that you will always have the same
> > StringBuilder instance.
> >
> > Cheers,
> > Jörg
> >
> >
> >
> > ---------------------------------------------------------------------
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> >
> >
>
>
> --
> Matt Sicker <boards@gmail.com>
>



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