Andrei Alexandrescu wrote:
Lionello Lunesu wrote:
Andrei Alexandrescu wrote:
auto rng = Random(unpredictableSeed);
auto a = 0.0, b = 1.0;
auto x1 = uniform!("[]")(rng, a, b);
auto x2 = uniform!("[)")(rng, a, b);
auto x3 = uniform!("(]")(rng, a, b);
auto x4 = uniform!("()")(rng, a, b);
I love your templates as much as the next guy, but let's not forget
the possibility of using different function names instead of
templating everything!?
I couldn't find good names. uniformOpenClosed, uniformOC,
uniformOpenLeft... what would be some good names?
I don't like that approach. The "[)", "[]" issue comes up every time
that you have a numeric range. It's not just random number generation.
Unfortunately something like the following is too ugly.
uniform(rng, Interval!("[)")(a, b));
A more radical possibility would be to make .nextUp, .nextDown built-in
primitives for floating-point types. Then you could make all the ranges
"[]".
And, as other have said, I'm ok with [) since that's what rand()%max
boiled down to as well. Futhermore, since arrays in D are also [),
users of D get used to it so it's not odd at all.
Ok. Let me just note that rand()%max is a lousy method of generating
random numbers between 0 and max-1 and everybody should put that in the
bin with Popular Examples That Should Never Be Used, together with
exponential Fibonacci, linear-space factorial, and bubblesort.
Andrei
