## modules/up/src/Core/gnu/RNG.h

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## FUNCTIONS

This source file includes following functions.

1. RNG

       1 // This may look like C code, but it is really -*- C++ -*-
       2 /*
       3 Copyright (C) 1988 Free Software Foundation
       4     written by Dirk Grunwald (grunwald@cs.uiuc.edu)
       5
       6 This file is part of the GNU C++ Library.  This library is free
       7 software; you can redistribute it and/or modify it under the terms of
       8 the GNU Library General Public License as published by the Free
       9 Software Foundation; either version 2 of the License, or (at your
      10 option) any later version.  This library is distributed in the hope
      11 that it will be useful, but WITHOUT ANY WARRANTY; without even the
      12 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
      13 PURPOSE.  See the GNU Library General Public License for more details.
      14 You should have received a copy of the GNU Library General Public
      15 License along with this library; if not, write to the Free Software
      16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
      17 */
      18 #ifndef _RNG_h
      19 #define _RNG_h 1
      20 #ifdef __GNUG__
      21 #pragma interface
      22 #endif
      23
      24 #include <assert.h>
      25 #include <math.h>
      26 #include <_G_config.h>
      27
      28 union PrivateRNGSingleType {                    // used to access floats as unsigneds
      29     float s;
      30     _G_uint32_t u;
      31 };
      32
      33 union PrivateRNGDoubleType {                    // used to access doubles as unsigneds
      34     double d;
      35     _G_uint32_t u[2];
      36 };
      37
      38 //
      39 // Base class for Random Number Generators. See ACG and MLCG for instances.
      40 //
      41 class RNG {
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      42     static PrivateRNGSingleType singleMantissa; // mantissa bit vector
      43     static PrivateRNGDoubleType doubleMantissa; // mantissa bit vector
      44 public:
      45     RNG();
      46     //
      47     // Return a long-words word of random bits
      48     //
      49     virtual _G_uint32_t asLong() = 0;
      50     virtual void reset() = 0;
      51     //
      52     // Return random bits converted to either a float or a double
      53     //
      54     float asFloat();
      55     double asDouble();
      56 };
      57
      58 #endif

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