Function parameter order

[David Holmes]

On 7/11/2012 2:58 AM, Kevin Bourrillion wrote:
> It sounds as though we're planning on Function<ReturnType, InputType>.

Yes. This was indicated, somewhat subtly in my view, in the review request:

- The argument lists are structured so that specializations act on the 
first argument(s), so IntMapper<T> is a specialization of Mapper<R,T>, 
and IntBinaryOperator is a specialization of BinaryOperator<T>.


I don't have a general preference other than maintaining consistency and 
given that we have Map<K,V> it seems to me that we have a long standing 
precedent to have the return type last not first.

David
-----

> I'd just like to note that this is going to put codebases that are in
> any stage of migration to JDK types from existing libraries including
> Guava in a really, really bad position.
>
> Every time I see Function<A, B> for /years/, I am going to have to check
> the imports to find out whether that's A->B or B-A.
>
> I'm not saying this consideration should trump all others. Just noting
> that I see this as a very bad problem for my user base.
>
> --
> Kevin Bourrillion | Java Librarian | Google, Inc. |kevinb at google.com
> <mailto:kevinb at google.com>
>