Adding Unicode operators to D [use cases]

[KennyTM~]

KennyTM~ wrote:
> bearophile wrote:
>> Sergey Gromov:
>>> I'd use dot "⋅" and cross "×" products for 3D, union "∪" and
>>> intersection "∩", subset "⊂" and superset "⊃" and their 
>>> negative forms.
>>>  I don't think I'd use anything else.
>>
>> I just want to note that the whole thread is almost unreadable on the 
>> digitalmars.com/webnews/, because it doesn't digest unicode chars at 
>> all. So adding unicode to D will give problems to show code.
>>
>> Unrelated to the unicode, but related on those opSubset, opSuperset, etc:
>> while implementing a set() class with the same API of the Python sets, 
>> I have seen there are the following operators/methods too:
>>
>> issubset(other) set <= other Test whether every element in the set is 
>> in other.
>>
>> set < other Test whether the set is a true subset of other, that is, 
>> set <= other and set != other.
>>
>> issuperset(other) set >= other Test whether every element in other is 
>> in the set.
>>
>> set > other Test whether the set is a true superset of other, that is, 
>> set >= other and set != other.
>>
>> A full opCmp can't be defined on sets, so I think in D1 we can't 
>> overload <= >= among sets... I think this is a problem has to be 
>> solved in D2, because sets are important enough.
>>
>> Bye,
>> bearophile
> 
> If the two sets are incomparable, just return NaN... We need an opCmp 
> that returns a float :)

Actually I've made a working solution. Even the exotic operators like 
!<= (not a subset of, ⊈) works too. It's designed for demonstration, not 
performance, though.
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