/usr/include/oce/math_BullardGenerator.hxx is in liboce-foundation-dev 0.17.1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | // Created on: 2014-07-18
// Created by: Alexander Malyshev
// Copyright (c) 2014-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
#ifndef _math_BullardGenerator_HeaderFile
#define _math_BullardGenerator_HeaderFile
#include <Standard_Real.hxx>
//! Fast random number generator (the algorithm proposed by Ian C. Bullard).
class math_BullardGenerator
{
public:
//! Creates new Xorshift 64-bit RNG.
Standard_EXPORT math_BullardGenerator(unsigned int theSeed = 1)
: myStateHi (theSeed)
{
myStateLo = theSeed ^ 0x49616E42;
}
//! Generates new 64-bit integer value.
Standard_EXPORT unsigned int NextInt()
{
myStateHi = (myStateHi >> 2) + (myStateHi << 2);
myStateHi += myStateLo;
myStateLo += myStateHi;
return myStateHi;
}
//! Generates new floating-point value.
Standard_EXPORT Standard_Real NextReal()
{
return NextInt() / static_cast<Standard_Real> (0xFFFFFFFFu);
}
private:
unsigned int myStateHi;
unsigned int myStateLo;
};
#endif
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