rnd.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2008
 *
 *  Last modified:
 *     $Date: 2012-09-07 11:29:57 +0200 (Fri, 07 Sep 2012) $ by $Author: schulte $
 *     $Revision: 13061 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
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 *  permit persons to whom the Software is furnished to do so, subject to
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 */

#include <ctime>

namespace Gecode {

  class Rnd : public SharedHandle {
  private:
    class IMP : public SharedHandle::Object {
    public:
      Support::RandomGenerator rg;
      IMP(unsigned int s);
      virtual ~IMP(void);
      GECODE_KERNEL_EXPORT
      virtual SharedHandle::Object* copy(void) const;
    };
  public:
    Rnd(void);
    GECODE_KERNEL_EXPORT Rnd(unsigned int s);
    Rnd(const Rnd& r);
    GECODE_KERNEL_EXPORT
    void seed(unsigned int s);
    void time(void);
    void hw(void);
    unsigned int seed(void) const;
    unsigned int operator ()(unsigned int n);
    bool initialized(void) const;
  };

  forceinline
  Rnd::IMP::IMP(unsigned int s)
    : rg(s) {}

  forceinline
  Rnd::IMP::~IMP(void) {}

  forceinline
  Rnd::Rnd(void) {}
  forceinline
  Rnd::Rnd(const Rnd& r)
    : SharedHandle(r) {}
  inline void
  Rnd::time(void) {
    seed(static_cast<unsigned int>(::time(NULL)));
  }
  inline void
  Rnd::hw(void) {
    seed(Support::hwrnd());
  }
  forceinline unsigned int
  Rnd::seed(void) const {
    const IMP* i = static_cast<const IMP*>(object());
    return i->rg.seed();
  }
  forceinline unsigned int
  Rnd::operator ()(unsigned int n) {
    IMP* i = static_cast<IMP*>(object());
    return i->rg(n);
  }
  forceinline bool
  Rnd::initialized(void) const {
    return object() != NULL;
  }

}

// STATISTICS: kernel-other