About std::vector::resize().

[Carlo Wood]

On Tue, May 25, 2004 at 12:36:30PM -0600, Martin Sebor wrote:
> Carlo Wood wrote:
> 
> >As far as I know this is implementation dependend and using swap
> >would be allowed (or so I was told not long ago).
> >
> >From a practical point of view this seems a very good idea.
> >One could implement a resize from size m to size n (n > m) as:
> >
> >- Create new vector with size n, using the default constructor
> >  for all elements.
> >- Swap the first m elements.
> >- Destroy the old vector.
> 
> That's not allowed by 23.2.4.2, p5:
> 
>     It is guaranteed that no reallocation takes place during
>     insertions that happen after a call to reserve() until the
>     time when an insertion would make the size of the vector
>     greater than the size specified in the most recent call
>     to reserve().

That seems obvious and I fail to see how this is related with
the subject of interest.

-- 
Carlo Wood <carlo@alinoe.com>