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
*
* 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
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <ctime>
namespace Gecode {
class Rnd : public SharedHandle {
private:
class IMP : public SharedHandle::Object {
protected:
GECODE_KERNEL_EXPORT static Support::Mutex m;
Support::RandomGenerator rg;
public:
IMP(unsigned int s);
unsigned int seed(void) const;
void seed(unsigned int s);
unsigned int operator ()(unsigned int n);
virtual ~IMP(void);
};
void _seed(unsigned int s);
public:
GECODE_KERNEL_EXPORT
Rnd(void);
GECODE_KERNEL_EXPORT
Rnd(const Rnd& r);
GECODE_KERNEL_EXPORT
Rnd& operator =(const Rnd& r);
GECODE_KERNEL_EXPORT
~Rnd(void);
GECODE_KERNEL_EXPORT
Rnd(unsigned int s);
GECODE_KERNEL_EXPORT
void seed(unsigned int s);
GECODE_KERNEL_EXPORT
void time(void);
GECODE_KERNEL_EXPORT
void hw(void);
unsigned int seed(void) const;
unsigned int operator ()(unsigned int n);
};
forceinline unsigned int
Rnd::IMP::seed(void) const {
unsigned int s;
const_cast<Rnd::IMP&>(*this).m.acquire();
s = rg.seed();
const_cast<Rnd::IMP&>(*this).m.release();
return s;
}
forceinline void
Rnd::IMP::seed(unsigned int s) {
m.acquire();
rg.seed(s);
m.release();
}
forceinline unsigned int
Rnd::IMP::operator ()(unsigned int n) {
unsigned int r;
m.acquire();
r=rg(n);
m.release();
return r;
}
forceinline unsigned int
Rnd::seed(void) const {
const IMP* i = static_cast<const IMP*>(object());
return i->seed();
}
forceinline unsigned int
Rnd::operator ()(unsigned int n) {
IMP* i = static_cast<IMP*>(object());
return (*i)(n);
}
}
// STATISTICS: kernel-other
Gecode::Rnd::seed
unsigned int seed(void) const
Return current seed.
Definition rnd.hpp:120
Gecode::Rnd::operator=
Rnd & operator=(const Rnd &r)
Assignment operator.
Definition rnd.cpp:64
Gecode::Rnd::time
void time(void)
Set current seed based on time (initializes if needed).
Definition rnd.cpp:75
Gecode::Rnd::operator()
unsigned int operator()(unsigned int n)
Return a random integer from the interval [0..n).
Definition rnd.hpp:125
Gecode::Rnd::~Rnd
~Rnd(void)
Destructor.
Definition rnd.cpp:68
Gecode::Rnd::Rnd
Rnd(void)
Default constructor that does not initialize the generator.
Definition rnd.cpp:57
Gecode::Rnd::hw
void hw(void)
Set current seed to hardware-based random number (initializes if needed).
Definition rnd.cpp:79
Gecode::SharedHandle::Object
The shared object.
Definition shared-object.hpp:53
Gecode::SharedHandle::SharedHandle
SharedHandle(void)
Create shared handle with no object pointing to.
Definition shared-object.hpp:122
Gecode::SharedHandle::object
SharedHandle::Object * object(void) const
Access to the shared object.
Definition shared-object.hpp:102
Gecode::Support::LinearCongruentialGenerator::seed
void seed(unsigned int s)
Set the current seed to s.
Definition random.hpp:77
Gecode::Support::Mutex
A mutex for mutual exclausion among several threads.
Definition thread.hpp:96
Gecode::Support::RandomGenerator
LinearCongruentialGenerator< 2147483647, 48271, 44488, 3399 > RandomGenerator
Default values for linear congruential generator.
Definition random.hpp:120
GECODE_KERNEL_EXPORT
#define GECODE_KERNEL_EXPORT
Definition kernel.hh:70
Gecode
Gecode toplevel namespace
Test::Int::Dom::r
const int r[4][2]
Definition dom.cpp:152
forceinline
#define forceinline
Definition config.hpp:187