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/********************************************************************************
* *
* R a n d o m N u m b e r G e n e r a t o r *
* *
*********************************************************************************
* Copyright (C) 2007,2022 by Jeroen van der Zijp. All Rights Reserved. *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/> *
********************************************************************************/
#ifndef FXRANDOM_H
#define FXRANDOM_H
namespace FX {
/**
* FXRandom provides a thread-safe random number generator with a period
* of around 1.84E19.
*/
class FXAPI FXRandom {
private:
FXulong state;
public:
/**
* Construct random generator with default seed value.
*/
FXRandom();
/**
* Construct random generator with given seed s.
* A good source of seed values may be the FXThread::time() function.
*/
FXRandom(FXulong s);
/**
* Initialize this random generator with the state of another.
*/
FXRandom(const FXRandom& s):state(s.state){}
/**
* Assignment state from another random generator.
*/
FXRandom& operator=(const FXRandom& s){ state=s.state; return *this; }
/**
* Generate next state of the random generator.
*/
FXulong next();
/**
* Change state of random generator with new seed s.
*/
void seed(FXulong s);
/**
* Get state of random generator.
*/
FXulong getState() const { return state; }
/**
* Set state of random generator. Ensure state is not zero!.
*/
void setState(FXulong s){ state=s; }
/**
* Draw random unsigned long, uniformly distributed.
*/
FXulong randLong();
/**
* Draw random float, uniformly distributed between 0 and 1.
*/
FXfloat randFloat();
/**
* Draw random double, uniformly distributed between 0 and 1.
*/
FXdouble randDouble();
};
}
#endif
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