From: Peng Yu (pengyu.ut_at_[hidden])
Date: 2007-09-27 11:38:41
Hi,
It is mentioned at
http://www.boost.org/libs/tuple/doc/tuple_users_guide.html#performance
that the following two ways would be different in term of performance.
//////////////
void f1(int&, double&);
tuple<int, double> f2();
//Then, the call #1 may be slightly faster than #2 in the code below:
int i; double d;
...
f1(i,d); // #1
tie(i,d) = f2(); // #2
///////////////////
What about the current commonly used compiler, such as GCC? Are #1 and
#2 different in GCC?
Does the compiler always have some way to optimize #2 to make it as
good as #1? Is it just a matter of fact whether the optimization
method is implemented?
Or #2 can never be made as good as #1?
Thanks,
Peng