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From: Pavol Droba (droba_at_[hidden])
Date: 2003-11-07 02:05:55

On Fri, Nov 07, 2003 at 02:03:15PM -0800, John Torjo wrote:
> Matthew Hurd wrote:
> >Any lib related to Boost that uses expression templates for string or
> >buffer
> >operations to minimize the temporary objects? Only thinking of
> >concatenation but I guess it might apply elsewhere.
> >
> >Might be a neat addition to the string algorithm library.
> I would think so ;)
> However, I'm not sure how realistic this could be.
> Just consider this:
> for ( int i = 0; i < 10000; ++i)
> s += "s";
> In cases like this, expression templates would be useless, IMO.
> Anyway, Pavol, any thoughts?

Expression templates might be an interesting idea, but I don't think that it
fits into the scope of the string_algo library.
This is more related as an extension to std::string. string_algo library
does not work with str::string only and it is oriented towards algorithms.

Besides that, it could be hard to estimate the benefits, that such a framework
could bring.
There isn't realy much to optimize except to removing temporary objects.
Given that fact, that string expression are usualy not very complicated and
usualy contains only a small number of operations, it is easy to rewrite such
an expression to use in-place variants if an optimalization is required.

Anyway, if somebody could come with such a framework, I'll be interested to see it.



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