[Issue 11092] @commutative annotation for commutative functions

[d-bugmail at puremagic.com]

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


bearophile_hugs at eml.cc changed:

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--- Comment #1 from bearophile_hugs at eml.cc 2013-09-22 04:22:47 PDT ---
(In reply to comment #0)
> 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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