Tuple assignment

Russel Winder via Digitalmars-d digitalmars-d at puremagic.com
Sat May 9 10:16:43 PDT 2015

Python has tuple assignment so you see things like:

        previous, current = current, previous + current

especially if you are doing silly things like calculating Fibonacci
Sequence values. Translating this to D, you end up with:

        TypeTuple!(current, next) = tuple(next , current +next);

I am assuming this is horrendously inefficient at run time compared to
having the intermediate value explicit:

        auto t = next;
        next = current + next;
        current = t;

or is it? 
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
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