modules/up/src/Core/gnu/RNG.h
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FUNCTIONS
This source file includes following functions.
- 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