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/// ------------------------------------------------------
/// RandomOps - (Pseudo) Random Number Generator For C#
/// Copyright (C) 2003-2010 Magnus Erik Hvass Pedersen.
/// Please see the file license.txt for license details.
/// RandomOps on the internet: http://www.Hvass-Labs.org/
/// ------------------------------------------------------
using System;
using System.Diagnostics;
namespace RandomOps
{
/// <summary>
/// Pseudo-Random Number Generator (PRNG) based on the RanQD1 (Quick and Dirty)
/// algorithm from the book: 'Numerical Recipes in C' chapter 7.1. Not thread-safe.
/// </summary>
public class RanQD : RanUInt32
{
#region Constructors.
/// <summary>
/// Constructs the PRNG-object and seeds the PRNG with the current time of day.
/// This is what you will mostly want to use.
/// </summary>
public RanQD()
: base()
{
Seed();
}
/// <summary>
/// Constructs the PRNG-object using the designated seed.
/// This is useful if you want to repeat experiments with the
/// same sequence of pseudo-random numbers.
/// </summary>
public RanQD(UInt32 seed)
: base()
{
Seed(seed);
}
#endregion
#region Internal definitions and variables
static readonly UInt32 L1 = 1664525;
static readonly UInt32 L2 = 1013904223;
/// <summary>
/// Is PRNG ready for use?
/// </summary>
bool IsReady = false;
/// <summary>
/// Iterator-variable.
/// </summary>
UInt32 Iter = 0;
#endregion
#region PRNG Implementation.
/// <summary>
/// Draw a random number in inclusive range {0, .., RandMax}
/// </summary>
public sealed override UInt32 Rand()
{
Debug.Assert(IsReady);
Iter = L1 * Iter + L2;
Debug.Assert(Iter >= 0 && Iter <= RandMax);
return Iter;
}
/// <summary>
/// The maximum possible value returned by Rand().
/// </summary>
public sealed override UInt32 RandMax
{
get { return UInt32.MaxValue; }
}
/// <summary>
/// Seed with an integer.
/// </summary>
protected sealed override void Seed(UInt32 seed)
{
Iter = seed;
IsReady = true;
}
#endregion
#region Base-class overrides.
/// <summary>
/// Name of the RNG.
/// </summary>
public override string Name
{
get { return "RanQD"; }
}
#endregion
}
}
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