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Groups > comp.lang.java.programmer > #13428

Re: diamond operator

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On 4/5/2012 4:11 AM, Arivald wrote:
> It will be better to provide "auto" type detector, like in C++.
> For example, instead of:
> Map<Integer, List<String>> map = new HashMap<Integer, List<String>>();
> use:
> auto map = new HashMap<Integer, List<String>>();
>
> ...and "map" variable will be resolved at compile time to
> HashMap<Integer, List<String>>.
>
> This allow very handy construct, like:
>
> auto data = SomeService.getProviders();
>
> In this case type of "data" will be deducted from return type of
> SomeService.getProviders().
>
> This will save lot of typing. And save refactoring time in case if
> getProviders return type changes. And will auto-adapt to changes in
> libraries.

Scala does that. And so does most other new functional languages.

But I am somewhat concerned about readability.

In the example the reader may not remember what getProviders()
return and therefor not know what type data is without looking
it up.

Arne

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diamond operator Roedy Green <see_website@mindprod.com.invalid> - 2012-04-03 18:54 -0700
  Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-04-03 22:06 -0400
  Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-04 13:12 +0200
    Re: diamond operator David Lamb <dalamb@cs.queensu.ca> - 2012-04-04 08:23 -0400
      Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-04 15:40 +0200
      Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-04-04 19:41 -0400
        Re: diamond operator David Lamb <dalamb@cs.queensu.ca> - 2012-04-05 08:03 -0400
  Re: diamond operator Jim Janney <jjanney@shell.xmission.com> - 2012-04-04 10:23 -0600
    Re: diamond operator Lew <lewbloch@gmail.com> - 2012-04-04 18:15 -0700
      Re: diamond operator David Lamb <dalamb@cs.queensu.ca> - 2012-04-05 15:44 -0400
        Re: diamond operator Jim Janney <jjanney@shell.xmission.com> - 2012-04-05 14:54 -0600
    Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-06 12:06 +0200
      Re: diamond operator Lew <lewbloch@gmail.com> - 2012-04-06 10:53 -0700
        Re: diamond operator Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-04-06 21:35 -0500
          Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-05-05 20:07 -0400
      Re: diamond operator Jim Janney <jjanney@shell.xmission.com> - 2012-04-06 19:56 -0600
        Re: diamond operator Jim Janney <jjanney@shell.xmission.com> - 2012-04-06 20:02 -0600
  Re: diamond operator Arivald <NOSPAMarivald@interia.pl> - 2012-04-05 10:11 +0200
    Re: diamond operator Lew <lewbloch@gmail.com> - 2012-04-05 11:34 -0700
      Re: diamond operator Arivald <NOSPAMarivald@interia.pl> - 2012-04-05 22:02 +0200
        Re: diamond operator ObeseeExpen <ObeseeExpen.5ibto0@no-mx.forums.yourdomain.com.au> - 2012-09-03 12:39 -0400
      Re: diamond operator Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-04-05 18:18 -0500
      Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-04-05 19:38 -0400
      Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-06 17:07 +0200
        Re: diamond operator Thufir <hawat.thufir@gmail.com> - 2012-04-06 08:51 -0700
          Re: diamond operator Silvio Bierman <silvio@moc.com> - 2012-04-08 15:12 +0200
    Re: diamond operator Arne Vajhøj <arne@vajhoej.dk> - 2012-04-05 19:41 -0400

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