On Saturday, 8 June 2024 at 13:19:30 UTC, Eric P626 wrote:
I managed to create a random number generator using the
following code:
~~~
auto rng = Random(42);
//....
uniform(0,10,rng);
~~~
Now I want to seed the generator using system time. I looked at
Date & time functions/classes and systime functions/classes.
The problem is that they all require a time zone. But I don't
need a time zone since there is no time zone. I just want the
number of seconds elapsed since jan 1st 1970. In other words,
the internal system clock value.
I'm not sure if anyone said it explicitly, but `uniform(0, 10)`
uses the default RNG
[`rndGen`](https://dlang.org/phobos/std_random.html#rndGen),
which is already properly seeded with an unpredictable seed:
Global random number generator used by various functions in
this module whenever no generator is specified. It is allocated
per-thread and initialized to an unpredictable value for each
thread.
So unless you are explicitly doing something like saving the seed
for future playback, I'd leave it off.
-Steve
