cumulate

[Brian Goetz]

It's gone.  (Well, not gone.  Mercurial history is still there.)

I propose this as the replacement:

In Arrays:
   void parallelPrefix(T[], int offset, int length, BinaryOperator<T>);
   void parallelPrefix(int[], int offset, int length, IntBinaryOperator);
   void parallelPrefix(long[], int offset, int length, LongBinaryOperator);
   void parallelPrefix(double[], int offset, int length, 
DoubleBinaryOperator);

plus trampolines for the offset=0, length=array.length case.

Doug already has code that is almost identical to this.  Maybe he will 
contribute it :)




On 12/21/2012 4:14 PM, Remi Forax wrote:
> On 12/21/2012 09:55 PM, Kevin Bourrillion wrote:
>> +1 (of course)
>
> yes, +1 too.
>
> Rémi
>
>>
>>
>> On Fri, Dec 21, 2012 at 12:53 PM, Brian Goetz <brian.goetz at oracle.com
>> <mailto:brian.goetz at oracle.com>> wrote:
>>
>>     After an offline conversation with Doug, we're considering
>>     ditching cumulate from Streams.  Reasons include:
>>
>>     1.  Everybody looks at it and says WTF?  And then has a YAGNI fit
>>     about throwing the kitchen sink into this API.
>>
>>     2.  The form in which cumulation is exposed here -- stream in,
>>     stream out -- is really all that useful to algorithms that need
>>     it.  It would be better to expose as an operation on Arrays instead.
>>
>>
>>
>>
>> --
>> Kevin Bourrillion | Java Librarian | Google, Inc. |kevinb at google.com
>> <mailto:kevinb at google.com>
>