[Issue 6110] New: std.functional: unaryFun should take an array alias.

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http://d.puremagic.com/issues/show_bug.cgi?id=6110

           Summary: std.functional: unaryFun should take an array alias.
           Product: D
           Version: future
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: timon.gehr at gmx.ch


--- Comment #0 from timon.gehr at gmx.ch 2011-06-05 15:55:36 PDT ---
I find myself writing code similar to the following quite a lot:

auto bbb = new bool[MAX];
auto arr = new int[MAX];
//...
writeln(filter!((a){return bbb[a];})(arr));

I think that it should be possible to do
writeln(filter!bbb(arr));

for the same effect.

It is generally useful to use an array as a function that maps integral indexes
to the element type of the array.

Therefore, I propose to improve unaryFun so that it implements the proposed
semantics.

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