Proto for Boost mailing list page: Re: [proto] Transform result_of nightmare and preserving terminal identity

Subject: Re: [proto] Transform result_of nightmare and preserving terminal identity
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2012-11-03 14:00:07

On 31/10/12 21:28, Agustín K-ballo Bergé wrote:

> Quoting from my original mail, what I want is to replace the following
> geometric vector expression:
>
>      p = q + r;
>
> by
>
>      p[0] = q[0] + r[0],
>      p[1] = q[1] + r[1],
>      ...,
>      p[N] = q[N] + r[N],
>      p;
>
> It **can** be done with a transform and that's what I did. The optimized
> proto expression evaluates ~33% faster than the original proto expression.

You could also evaluate the expression directly instead of rebuilding a 
new expression to evaluate.

That would probably increase compilation performance.