[boost] Re: tuple - pair interoperability

From: David Abrahams (dave_at_[hidden])
Date: 2004-05-05 13:26:02

Jaakko Jarvi <jajarvi_at_[hidden]> writes:

> On May 4, 2004, at 7:56 PM, Fredrik Blomqvist wrote:
>
>> I think it would be convenient if one could treat std::pair as a boost
>> two-tuple.
>> Both tuples::tie and tuple assignment already work with std::pair
>> but I've
>> noticed that the get<> accessor doesn't.
>>
>> So, I propose a simple extension to tuples::get<> with the obvious
>> semantics:
>> boost::get<0>(p) == p.first
>> boost::get<1>(p) == p.second
>>
>
> The trouble with get is that pairs live in namespace std, so if pair
> get's are not
> in std, they won't get found by ADL. But if we are willing to live
> with not having ADL,
> adding gets for pairs would be fine.

Isn't there another problem?  Are references legal arguments for std::pair?
-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com