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hw-rnd.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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6  * Copyright:
7  * Christian Schulte, 2012
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33 
34 #ifdef _MSC_VER
35 
36 #define _CRT_RAND_S
37 #include <stdlib.h>
38 
39 #include <gecode/support.hh>
40 
41 namespace Gecode { namespace Support {
42 
43  unsigned int hwrnd(void) {
44  unsigned int r;
45  (void) rand_s(&r);
46  return r;
47  }
48 
49 }}
50 
51 #else
52 
53 #include <gecode/support.hh>
54 
55 #include <fstream>
56 
57 namespace Gecode { namespace Support {
58 
59  unsigned int hwrnd(void) {
60  std::fstream devrandom;
61  devrandom.open("/dev/random", std::fstream::in);
62  unsigned int rnd;
63  devrandom.read(reinterpret_cast<char*>(&rnd),sizeof(unsigned int));
64  devrandom.close();
65  return rnd;
66  }
67 
68 }}
69 
70 #endif
71 
72 // STATISTICS: support-any
73 
NNF * r
Right subtree.
Definition: bool-expr.cpp:242
unsigned int hwrnd(void)
Return hardware generated random number.
Definition: hw-rnd.cpp:59