On Aug 21, 2006, at 7:20 AM, Andy Little wrote:
In fact you can do in place addition of quantities of course, but not multiplication, or at least not without low level manipulations.
It sounds like I am arguing against my own library. I'm not, but I am pointing out that there are different considerations when using quantities and you may not ( in fact probably wont) get as good a performance as from using inbuilt floats. Overall Quan is much more fun to use than floats though, and I have enjoyed using it so far where possible..
In fact it seems to me that you are much better off using a nice linear algebra library that makes use of expression templates.
To be honest you have lost me here. Are you now saying it would be better for me to ditch Quan and start writing a linear algebra library for floats that uses E.T?
No, I'm saying: don't worry about temporaries in your vector expressions but just use an expression template based library with your Quan types. There should be no problem. Matthias