Re: Argument scope

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <>
Thu, 02 Dec 2010 18:31:54 -0500
On 02-12-2010 01:42, Stefan Ram wrote:

   Here is an idea for a new scope in Java (could be
   used in other languages as well):

void fill
( final int color
   { final int RED = 1;
     final int GREEN = 2;
     final int BLUE = 3; })
{ /* ... */ }

   Now one can call this as, for example:

fill( GREEN );

   But one does not need to write

fill( Class.GREEN );

   or so anymore.

   The scope of the identifier ?GREEN? is only the
   argument expression corresponding to the parameter
   ?color?. So GREEN is not recognized here:

final int i = GREEN; fill( i ); /* not supported */

   If ?Beta? is an interface, one can also write:

void fill( final int color import Beta ){ /* ... */ }

   , to ?import? the constants of the interface Beta for
   this purpose.

   Or, we could have an import for Enum types:

void test( final enum Day import ){ /* ... */ }

   , so that one then can write

test( MONDAY )

   instead of

test( Day.MONDAY )

There are actually two questions:
1) is this a feature that is useful?
2) is this feature so useful that it is worth adding
    to the complexity of the language?

I would tend to say YES and NO.


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