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/********************* */
/*! \file sampler.h
** \verbatim
** Top contributors (to current version):
** Andres Noetzli, Mathias Preiner
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 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 Sampler class that generates random values of different sorts
**
** The Sampler class can be used to generate random values of different sorts
** with biased and unbiased distributions.
**/
#include "cvc4_private.h"
#ifndef CVC4__UTIL_FLOATINGPOINT_SAMPLER_H
#define CVC4__UTIL_FLOATINGPOINT_SAMPLER_H
#include "util/floatingpoint.h"
#include "util/random.h"
namespace CVC4 {
class Sampler
{
public:
/**
* Generates a random, uniform bit-vector value.
*/
static BitVector pickBvUniform(unsigned sz);
/**
* Generates a random, uniform floating-point value.
*/
static FloatingPoint pickFpUniform(unsigned e, unsigned s);
/**
* Generates a random floating-point value biased towards special values
* (e.g. +/- inf) and interesting bit-patterns (e.g. values with a zero
* significand).
*/
static FloatingPoint pickFpBiased(unsigned e, unsigned s);
private:
/**
* Probablility with which special floating-point values are picked when
* picking a biased floating-point value
*/
static constexpr double probSpecial = 0.2;
};
} // namespace CVC4
#endif /* CVC4__UTIL_FLOATINGPOINT_SAMPLER_H */
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