On 16 Feb 2007, at 12:19, Eric Niebler wrote:
Gennadiy Rozental wrote:
Another general comment. I personally would find single changing variable oriented interface more convenient and ore widely applicable (as opposed to the samples set). Variable could change in many ways (not only addition or subtraction, and even those could be done more conveniently with operator overloading). Essentially what I am looking for is something like this:
tracked_var<....> v;
v += 10;
int i = v +1;
v -= 5;
v *= 2;
cout << average( v ); cout << max( v ); cout << min( v );
cout << max( average( v ) ) << " @" min( average( v ) ).time();
Interesting. Each mutating operation on v is considered a new sample? This is a less powerful interface (no way to express covariate data; eg., where is the time of each sample specified?), but might be cleaner for some applications. It would be pretty simple to implement such an interface on top of accumulator_set.
One problem I see with this is: how does the tracked_var know when to record the current value if it does not change? Do I need to do v += 0. if I want to enforce a sample even when the value does not change? Matthias