How to generate a random number from system clock as seed

[drug007]

On 08.06.2024 16:19, 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.
> 

```d
import std;

void main()
{
     {
         auto rng = Random(42);
         auto result = generate!(() => uniform(0, 10, rng))().take(7);
	// the same random numbers sequence
         assert (result.equal([2, 7, 6, 4, 6, 5, 0]));
     }

     {
         const seed = castFrom!long.to!uint(Clock.currStdTime);
         auto rng = Random(seed);
         auto result = generate!(() => uniform(0, 10, rng))().take(7);
	// new random numbers sequence every time
         result.writeln;
     }
}
```