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hw-rnd.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2012
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9  * Last modified:
10  * $Date: 2012-08-30 15:16:34 +0200 (Thu, 30 Aug 2012) $ by $Author: schulte $
11  * $Revision: 13026 $
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37 
38 #ifdef _MSC_VER
39 
40 #define _CRT_RAND_S
41 #include <stdlib.h>
42 
43 #include <gecode/support.hh>
44 
45 namespace Gecode { namespace Support {
46 
47  unsigned int hwrnd(void) {
48  unsigned int r;
49  (void) rand_s(&r);
50  return r;
51  }
52 
53 }}
54 
55 #else
56 
57 #include <gecode/support.hh>
58 
59 #include <fstream>
60 
61 namespace Gecode { namespace Support {
62 
63  unsigned int hwrnd(void) {
64  std::fstream devrandom;
65  devrandom.open("/dev/random", std::fstream::in);
66  unsigned int rnd;
67  devrandom.read(reinterpret_cast<char*>(&rnd),sizeof(unsigned int));
68  devrandom.close();
69  return rnd;
70  }
71 
72 }}
73 
74 #endif
75 
76 // STATISTICS: support-any
77 
NNF * r
Right subtree.
Definition: bool-expr.cpp:246
Gecode toplevel namespace
unsigned int hwrnd(void)
Return hardware generated random number.
Definition: hw-rnd.cpp:63