Re: [boost] Re: [boost.variant] It is possible to make a variant LessThanComparable

From: Peter Dimov (pdimov_at_[hidden])
Date: 2003-08-31 09:45:14

David Abrahams wrote:
> "Eric Friedman" <ebf_at_[hidden]> writes:
>
>> Ultimately, I do not believe any ordering scheme will provide
>> meaningful, straightforward semantics. Assuming I am correct, I
>> propose that the variant library offer your ordering scheme -- but
>> only as an explicit comparison function, calling it variant_less.
>> This would allow, for instance:
>>
>>   std::set< my_variant, boost::variant_less<my_variant> >
>>
>> I'd appreciate feedback.
>
> I had the same thought myself, though I'd be inclined to spend a
> little time searching for a better name than "less", since it doesn't
> really mean that.  Maybe "variant_before", using type_info::before as
> a precedent?

If you want a second opinion, I'm in the "just provide operator== and
operator<" camp.