Re: [Vxl-users] Fast Programming

[Peter V. <Pet...@es...>]

> Isn't it faster to do the declarations out of the loop, for example
> instead of
>   for (unsigned p=0;p<np;++p,planeA += pstepA,planeB += pstepB,planeS += pstepS)
>   {
>     const aT* rowA   = planeA;
      ...
> using following technique:
>   unsigned p;
>   const aT* rowA;
>   for ( p=0;p<np;++p,planeA += pstepA,planeB += pstepB,planeS += pstepS)
>   {
>     ...

Modern C++ compilers should implement both ways identically, certainly
when optimisation is on (but probably also without optimisation).
I have never tested this, though.


--	Peter.