random getstate/setstate

[telengard]

Thank you very much Wyverex for the help.

If I'm reading the code correctly the index is doing all the magic to keep track of where to resume?

thanks,
~telengard

> import
>    std.c.time,
>    std.random,
>    std.stdio;
> 
> 
> class Random
> {
>    private uint seed, index;
> 
>    this()
>    {
>       seed = time( null );
>       rand_seed( seed, index );
>    }
> 
>    this( uint _seed, uint _index = 0 )
>    {
>      seed = _seed;
>      index = _index;
>      rand_seed( seed, index );
>    }
> 
>    void reseed( )
>    {
>      seed = time( null );
>      index = 0;
>      rand_seed( seed, index );
>    }
> 
>    void reseed( uint _seed, uint _index = 0 )
>    {
>      seed = _seed;
>      index = _index;
>      rand_seed( seed, index );
>    }
> 
>    synchronized int next() { ++index; return rand(); }
> 
>    uint getseed() { return seed; }
>    uint getindex() { return index; }
> }
> 
> void main()
> {
>    //first random
>    auto r = new Random;
>    writefln("%d %d %d", r.next, r.next, r.next);
>    //reset seed..
>    auto r2 = new Random(r.getseed);
>    writefln("%d %d %d", r2.next, r2.next, r2.next);
> 
>    //get next 3
>    writefln("%d %d %d", r.next, r.next, r.next);
> 
>    //use index to get same numbers with seed
>    r.reseed(r.getseed, r.getindex-3);
>    writefln("%d %d %d", r.next, r.next, r.next);
> }
>