Re: ada.strings.unbounded "free" and "String_Access"

[Ted Dennison <dennison@telepath.com>]

In article <38C6D4DE.D482DA0C@acm.org>,
  jrcarter@acm.org wrote:
> Nick Roberts wrote:
> >
> > The purpose is simply this: if Unbounded_String doesn't give you
> > quite enough flexibility in certain parts of your code (e.g. you
> > need more speed), you can use the type String_Access instead.
> >

> You don't need an access type for this (in Ada, you rarely need access
> types at all). You can simply operate on the String returned by
> To_String:

You miss Nick's point. Doing that would cause the entire contents of the
string to get copied. For a somewhat longish string, passing the pointer
of the String_Access around instead would be significantly faster. I
just yesterday had to perform that very optimization in some code of
ours that is running at 60Hz with hard realtime performance
requirements.

--
T.E.D.

http://www.telepath.com/~dennison/Ted/TED.html


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