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

Subject: Re: [boost] [utility] new auto_buffer class --- RFC
From: Felipe Magno de Almeida (felipe.m.almeida_at_[hidden])
Date: 2009-03-02 13:29:55

On Mon, Mar 2, 2009 at 3:19 PM, Thorsten Ottosen
<thorsten.ottosen_at_[hidden]> wrote:
> Thorsten Ottosen skrev:
>>

[snip]

> I guess your case above should be implemented as
>
> for # of rows
>   v.clear();
>   v.resize( n );
>   for each element read e
>      v.push_back_unchecked(e)
>   process( v.begin(), v.end() )
>
> where v.resize() should never actually shrink the buffer.
> (Do we need another function that does that?), or should we simply
> rename v.resize(n) to v.ensure_capacity(n).
>
> But as the example above shows, we do not need a growing push_back()
> here.

Nor we would for std::vector if we use it the way you suggest.

> If the name push_back() is problematic, then I'm all for just calling
> it something else.

How is the usage you shown faster than a growing push_back?

> But I don't like adding a growing push_back() unless we have a use-case.

The use-case seems obvious to me. A vector that can use stack-allocation
for >90% of the cases for an application. As someone pointed out, signals2
uses one in a detail namespace.

> -Thorsten

Regards,
-- 
Felipe Magno de Almeida