a patch for new default methods in Map + more

Vitaly Davidovich vitalyd at gmail.com
Fri Jan 4 11:30:09 PST 2013

Once compiler kicks in and inlines (I'm assuming it will) Objects.equals,
shouldn't the profile information get propagated into the caller? Avoiding
small util methods just to preserve profile info would imply that the
compiler is suboptimal, no?

Sent from my phone
On Jan 4, 2013 2:11 PM, "Remi Forax" <forax at univ-mlv.fr> wrote:

> On 01/04/2013 07:09 PM, Doug Lea wrote:
> > On 01/04/13 12:11, Peter Levart wrote:
> >> Hi,
> >>
> >> I propose a patch for some new default methods in j.u.Map and some more:
> >>
> >> http://dl.dropbox.com/u/101777488/jdk8-lambda/Map/webrev.02/index.html
> >>
> > Thanks for redoing these as a webrev!
> Peter, you should not add Objects.equals() here, you can use it if you
> know that a key will be null,
> but not if you don't know. You have to write the null check in the
> method and let the VM do the profiling.
> With that, users that never use a HashMap with null key may not pay the
> extra cost of the null check.
> If you use Objects.equals, because it will be also used in a method with
> a value that is null, the VM will always do the check.
> Rémi

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