A Web-based News Reader
| Subject | Re: random getstate/setstate | ||||||||||||
| From | Wyverex <wyverex.cypher@gmail.com> | ||||||||||||
| Date | Sun, 10 Aug 2008 23:22:12 -0400 | ||||||||||||
| Newsgroups | digitalmars.D.learn | ||||||||||||
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); } | |||||||||||||
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