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/********************* */
/*! \file random.h
** \verbatim
** Top contributors (to current version):
** Aina Niemetz
** This file is part of the CVC4 project.
** Copyright (c) 2009-2018 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief A Random Number Generator.
**
** A random number generator, implements the xorshift* generator
** (see S. Vigna, An experimental exploration of Marsaglia's xorshift
** generators, scrambled. ACM Trans. Math. Softw. 42(4): 30:1-30:23, 2016).
**/
#include "cvc4_private.h"
#ifndef __CVC4__UTIL__RANDOM_H
#define __CVC4__UTIL__RANDOM_H
namespace CVC4 {
class Random
{
public:
Random(uint64_t seed) { setSeed(seed); }
/* Get current RNG (singleton). */
static Random& getRandom()
{
static thread_local Random s_current(0);
return s_current;
}
/* Set seed of Random. */
void setSeed(uint64_t seed)
{
d_seed = seed == 0 ? ~seed : seed;
d_state = d_seed;
}
/* Next random uint64_t number. */
uint64_t rand();
/* Pick random uint64_t number between from and to (inclusive). */
uint64_t pick(uint64_t from, uint64_t to);
/* Pick random double number between from and to (inclusive). */
double pickDouble(double from, double to);
/* Pick with given probability (yes / no). */
bool pickWithProb(double probability);
private:
/* The seed of the RNG. */
uint64_t d_seed;
/* The current state of the RNG. */
uint64_t d_state;
};
} // namespace CVC4
#endif
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