Re: Reserve_Capacity for Unbounded_String?

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Wed, 25 Jul 2007 23:24:03 -0700, Maciej Sobczak wrote:

> This is what I'm actually doing when typing this post. I append
> characters to what is already there (let's forget correcting typos -
> automated procedures don't have to do this).

You append characters to words, words to sentences and sentences to
paragraphs. String is not the best possible representation for a text.

> It is the language that
> should provide the implementation that is best fitted to how
> programmers express their algorithms. Why do you think Java added
> StringBuilder to its library? Because the immutable String didn't
> quite cut it.

Maybe, but Unbounded_String is not the best way to express algorithms. As
for me I avoid using Unbounded_String. I don't like the design of.

This does not mean that other containers should not have
"accumulation"/"stream" mode. For them I tend to specify the initial size
and the multiplier factor.

Perhaps, one could introduce something like that for Unbounded_String:

   X : Unbounded_String := ...;
   for X'Initial_Size use 1024*8;  -- 1K at least
   for X'Increment_Factor use 1.5; -- Multiply by 1.5 upon expanding


-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de