Thorsten Ottosen <tottosen@dezide.com> writes:
No, that's not the same thing at all. Read what I wrote again.
ok, so we could return a tripple {begin,found,end}.
I said quadruple. I meant {begin,found,found+1,end}.
this means that
1. we loose the benefit of a default
The default might be a different function. In fact it would be in your case, too, since you can't deduce an explicit template argument from a default value.
2. a slight overhead (the tripple construction cannot be optmized away)
How do you know? The compiler can optimize anything it wants as long as it doesn't change the observable behavior.
3. at least as complicated an implementation
Maybe.
I couldn't find the definition of "temporary" in the standard; is it defined and inherted from C?
It's not explicitly defined anywhere. The standard describes situations in which a "temporary object" or "temporary" is created and then has special rules for what can be done with such an object.
Sounds easy enough to do without a switch. And anyway, who cares about such a tiny implementation detail?
nobody unless it affects the generated code size/speed.
Right. -- Dave Abrahams Boost Consulting www.boost-consulting.com