Re: [boost] [fusion] More quanfusion

From: Geoffrey Irving (irving_at_[hidden])
Date: 2006-09-15 00:01:30

On Fri, Sep 15, 2006 at 03:28:39AM +0100, Andy Little wrote:
> Then I  guess in fusion you would do :
> 
> fusion::inner_product<SequenceA, SequenceB,Function1,Function2>{...}
> 
> fusion::dot_product<SequenceA, SequenceB>
>    : fusion::inner_product<
>        SequenceA,SequenceB,
>         boost:functional::multiplies,boost::functional::plus
> >{};

Just to clarify the terminology: that inner_product function is still
essentially a dot product.  A dot_product is anything that looks like

    product = x*x + y*y + z*z + ...

where + and * can be any ring operations.  A general inner product
function would have to allow for cross terms, e.g.,

    product = a*x*x + b*x*y + c*y*y + ...

So, I'd go for calling everything dot_product and giving it default
arguments for + and *.

Geoffrey