• d-bugmail puremagic.com (19/19) Sep 22 2013 http://d.puremagic.com/issues/show_bug.cgi?id=11092
• d-bugmail puremagic.com (22/23) Sep 22 2013 http://d.puremagic.com/issues/show_bug.cgi?id=11092

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=11092

           Summary:  commutative annotation for commutative functions
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: druntime
        AssignedTo: nobody puremagic.com
        ReportedBy: daniel350 bigpond.com



The title should be self-expressive, for heavily constrained functions, it
would be nice to just be able to tag them as commutative rather than spam the
identical function prototype with a redirect to original.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=11092


bearophile_hugs eml.cc changed:

           What    |Removed                     |Added
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                 CC|                            |bearophile_hugs eml.cc




 The title should be self-expressive,

This is an enhancement request, so the title is never self-expressive:
- What are some use cases?
- What are the limits?
- Do you mean just functions with two arguments?
- What if one, the other or both arguments have a default value?
- What about testing. QuickCheck-like tools for D would enjoy to know what
functions are annotated with such  commutative, to test at run-time they are
actually commutative. For this std.traits.functionAttributes will need to take
into account  commutative functions too.

More notes:
- std.functional.memoize could detect a  commutative function and sometimes
reduce the memory usage of its associative array.

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