/// <summary>
/// Initializes the generator.
/// </summary>
/// <param name="seed">Seed of the generator</param>
/// <param name="init">Settings of the Mersenne twister. The default value is
/// MT19937.</param>
public UDEMersenneRandom(uint?seed = null, MersenneRandomInit?init = null)
{
if (!init.HasValue)
{
this.init = DEFAULT;
}
else
{
this.init = init.Value;
}
if (!seed.HasValue)
{
this.seed =
(uint)System.DateTime.UtcNow.Millisecond
* (uint)Thread.CurrentThread.ManagedThreadId
* (uint)Process.GetCurrentProcess().Id;
}
else
{
this.seed = seed.Value;
}
mt = new uint[this.init.n];
index = this.init.n + 1;
lowerMask = (1u << this.init.r) - 1;
upperMask = ~lowerMask;
SeedMT();
}
static UDEMersenneRandom()
{
DEFAULT = new MersenneRandomInit()
{
n = 624,
m = 397,
r = 31,
a = 0x9908b0df,
b = 0x9d2c5680,
c = 0xefc60000,
s = 7,
t = 15,
u = 11,
d = 0xffffffff,
l = 18,
f = 1812433253u
};
}
