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// This may look like C code, but it is really -*- C++ -*-
/*
Copyright (C) 1988 Free Software Foundation
written by Dirk Grunwald (grunwald@cs.uiuc.edu)
This file is part of the GNU C++ Library. This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version. This library is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _RNG_h
#define _RNG_h 1
#ifdef __GNUG__
#pragma interface
#endif
#include <assert.h>
#include <math.h>
#include <_G_config.h>
union PrivateRNGSingleType { // used to access floats as unsigneds
float s;
_G_uint32_t u;
};
union PrivateRNGDoubleType { // used to access doubles as unsigneds
double d;
_G_uint32_t u[2];
};
//
// Base class for Random Number Generators. See ACG and MLCG for instances.
//
class RNG {
static PrivateRNGSingleType singleMantissa; // mantissa bit vector
static PrivateRNGDoubleType doubleMantissa; // mantissa bit vector
public:
RNG();
//
// Return a long-words word of random bits
//
virtual unsigned long asLong() = 0;
virtual void reset() = 0;
//
// Return random bits converted to either a float or a double
//
float asFloat();
double asDouble();
};
#endif
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