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/********************* */
/*! \file random.h
** \verbatim
** Top contributors (to current version):
** Aina Niemetz, Andres Noetzli, Mathias Preiner
** This file is part of the CVC4 project.
** Copyright (c) 2009-2021 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 cvc5 {
class Random
{
public:
using result_type = uint64_t;
/** Constructor. */
Random(uint64_t seed);
/** Get current RNG (singleton). */
static Random& getRandom()
{
static thread_local Random s_current(0);
return s_current;
}
/** Get the minimum number that can be picked. */
static constexpr uint64_t min() { return 0u; }
/** Get the maximum number that can be picked. */
static constexpr uint64_t max() { return UINT64_MAX; }
/** Set seed of Random. */
void setSeed(uint64_t seed);
/** Operator overload to pick random uin64_t number (see rand()). */
uint64_t operator()();
/** 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 cvc5
#endif
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