Re: [boost] Interest in an 'either' library?

Subject: Re: [boost] Interest in an 'either' library?
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2013-06-23 08:12:22

On 23/06/13 13:45, Mateusz Loskot wrote:
> On 21 Jun 2013 17:36, "David Sankel" <camior_at_[hidden]> wrote:
>>
>> **Use 2**: A lightweight alternative to boost::variant when only 2
>> components are required (either relates to variant in a similar way that
>> pair relates to tuple ).
>> (...)
>>
>> either<A,B> eitherAOrB;
>>
>> if( eitherAOrB.is_left() )
>>    std::cout << "A: " << eitherAOrB.left();
>> else
>>    std::cout << "B: " << eitherAOrB.right();
>
> Is there any particular reason not to follow std::pair naming
> and use first() and second() members?

first()/second() implies a sequence with at least two elements.