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Re: How to re-initialize random generator? [message #23047 is a reply to message #23035]

Thu, 10 September 2009 14:28

mirek
Messages: 13984
Registered: November 2005

Ultimate Member

Mindtraveller wrote on Wed, 09 September 2009 11:30

It looks like Core has some advanced version of random numbers generator adopted from Makoto Matsumoto works (Core/Random.cpp).
My question is how to reinitialize this generator each time program start for it to generate different values on each start? (I mean, something like Randomize() ).

Well, it is seeding automatically:

MTrand::MTrand()
{
	mti = N + 1;
	mag01[0] = 0;
	mag01[1] = MATRIX_A;
	dword seed[1024];
#ifdef PLATFORM_POSIX
	int fd = open("/dev/urandom", O_RDONLY);
	read(fd, seed, sizeof(seed));
#else
	for(int i = 0; i < 1024; i++) {
		Uuid uuid;
		CoCreateGuid((GUID *)&uuid);
		seed[i] = GetHashValue(uuid);
	}
#endif
	init_by_array(seed, 1024);
}

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