[boost] Re: Formal Review: Assignment Library

From: Alexander Nasonov (alnsn-mycop_at_[hidden])
Date: 2004-04-06 02:13:57

Thorsten Ottosen wrote:

>>I'd prefer to have on-fly container. Something like this:
>>
>>std::copy( on_fly % 1 % 2 % 3, on_fly_end<int>(), back_inserter<int>(v));
>>
>>Not as cool as v += 1, 2, 3; but might have some advantages.
> 
> What would the advantages be?
This have advantage when the container is not available, only iterators
range.

template<class Iter>
void one_two_three(Iter begin, Iter end)
{
    assert(distance(begin, end) >= 3);
    copy(on_fly % 1 % 2 % 3, on_fly_end<int>(), begin);
}

It has some serious problem, though. For example, in

find(on_fly % 1 % 2 % 3, on_fly_end<int>(), 2);

return value points to temporary.

-- 
Alexander Nasonov
Independent Developer and Consultant