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Gabriele Cosmo
2019-12-06 15:12:28 +01:00
parent b2a62ae692
commit 5baee230e9
2997 changed files with 141580 additions and 98673 deletions
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source/global/HEPRandom/include/G4QuickRand.hh
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//
// ********************************************************************
// * License and Disclaimer *
// * *
// * The Geant4 software is copyright of the Copyright Holders of *
// * the Geant4 Collaboration. It is provided under the terms and *
// * conditions of the Geant4 Software License, included in the file *
// * LICENSE and available at http://cern.ch/geant4/license . These *
// * include a list of copyright holders. *
// * *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work make any representation or warranty, express or implied, *
// * regarding this software system or assume any liability for its *
// * use. Please see the license in the file LICENSE and URL above *
// * for the full disclaimer and the limitation of liability. *
// * *
// * This code implementation is the result of the scientific and *
// * technical work of the GEANT4 collaboration. *
// * By using, copying, modifying or distributing the software (or *
// * any work based on the software) you agree to acknowledge its *
// * use in resulting scientific publications, and indicate your *
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
//
//
#ifndef G4QUICKRAND_HH
#define G4QUICKRAND_HH
#include <cstdint>
#include "G4Types.hh"
inline G4double G4QuickRand()
{
static const G4double f = 1. / 4294967296.; // 2^-32
// Algorithm "xor" from p.4 of G.Marsaglia, "Xorshift RNGs"
static G4ThreadLocal uint32_t y = 2463534242;
uint32_t x = y;
x ^= x << 13;
x ^= x >> 17;
x ^= x << 5;
y = x;
return x * f;
}
#endif // G4QUICKRAND_HH