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