Re: [boost] Question about submission process

From: Michael Lacher (michael.lacher_at_[hidden])
Date: 2007-04-05 04:33:21

David Abrahams wrote:
> on Mon Apr 02 2007, "Eric Lemings" <lemings-AT-roguewave.com> wrote:
> 
>> Expression templates sound very interesting.  Could you give a quick
>> summary or a link perhaps?
> 
> This is the canonical source:
> 
> http://osl.iu.edu/~tveldhui/papers/Expression-Templates/exprtmpl.html
> 

Hmm, isnt that just boost::lambda? I haven't used boost::lambda much 
yet, and i am not really proficient in functional programmign either, 
but could not the example form the page above:

int main()
{
        DExpr<DExprIdentity> x;         // Placeholder
        evaluate(x/(1.0+x), 0.0, 10.0);
        return 0;
}

be written in boost:lambda as follows ?

int main()
{
        evaluate(_1/(1.0+_1), 0.0, 10.0);
        return 0;
}

If yes, what exactly can expression templates do that boost lambda cannot ?

Michael Lacher