Re: [boost] [utility] new auto_buffer class --- RFC

Subject: Re: [boost] [utility] new auto_buffer class --- RFC
From: Christopher Jefferson (chris_at_[hidden])
Date: 2009-03-02 16:26:24

On 2 Mar 2009, at 20:12, Thorsten Ottosen wrote:

> Frank Mori Hess skrev:
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>> On Monday 02 March 2009, Thorsten Ottosen wrote:
>>> Ok, but can you determine the size of the buffer in advance, so  
>>> you can
>>> call reserve?
>> Yes.  If you're proposing adding the ability to grow an  
>> auto_buffer's capacity after it is constructed via a reserve()  
>> call, I could live with that.
>
> No, I was actually advocating the that push_back should not grow.
>
> But as pointed out in another part of this thread, we need both cases.
>
> push_back()
> push_back_unchecked()
>
> you will be able to use the latter, which is more efficient.

You could make exactly the same argument about pushing back into a  
vector, why not have a push_back_unchecked that doesn't check if  
reallocation must occur. I did once experiment with this and got no  
measurable speed improvement.

Chris