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C++ websocket client/server library
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random_device.hpp
1 /*
2  * Copyright (c) 2014, Peter Thorson. All rights reserved.
3  *
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27 
28 #ifndef WEBSOCKETPP_RANDOM_RANDOM_DEVICE_HPP
29 #define WEBSOCKETPP_RANDOM_RANDOM_DEVICE_HPP
30 
31 #include <websocketpp/common/random.hpp>
32 
33 namespace websocketpp {
34 namespace random {
35 /// RNG policy based on std::random_device or boost::random_device
36 namespace random_device {
37 
38 /// Thread safe non-deterministic random integer generator.
39 /**
40  * This template class provides thread safe non-deterministic random integer
41  * generation. Numbers are produced in a uniformly distributed range from the
42  * smallest to largest value that int_type can store.
43  *
44  * Thread-safety is provided via locking based on the concurrency template
45  * parameter.
46  *
47  * Non-deterministic RNG is provided via websocketpp::lib which uses either
48  * C++11 or Boost 1.47+'s random_device class.
49  *
50  * Call operator() to generate the next number
51  */
52 template <typename int_type, typename concurrency>
53 class int_generator {
54  public:
55  typedef typename concurrency::scoped_lock_type scoped_lock_type;
56  typedef typename concurrency::mutex_type mutex_type;
57 
58  /// constructor
59  //mac TODO: figure out if signed types present a range problem
61 
62  /// advances the engine's state and returns the generated value
63  int_type operator()() {
64  scoped_lock_type guard(m_lock);
65  return m_dis(m_rng);
66  }
67  private:
68 
69 
70  lib::random_device m_rng;
71  lib::uniform_int_distribution<int_type> m_dis;
72 
73  mutex_type m_lock;
74 };
75 
76 } // namespace random_device
77 } // namespace random
78 } // namespace websocketpp
79 
80 #endif //WEBSOCKETPP_RANDOM_RANDOM_DEVICE_HPP
websocketpp::random::random_device
RNG policy based on std::random_device or boost::random_device.
Definition: random_device.hpp:36
websocketpp::random
Random number generation policies.
Definition: none.hpp:33
websocketpp::random::random_device::int_generator::operator()
int_type operator()()
advances the engine's state and returns the generated value
Definition: random_device.hpp:63
websocketpp::random::random_device::int_generator::int_generator
int_generator()
constructor
Definition: random_device.hpp:60
websocketpp::versions_supported
static std::vector< int > const versions_supported(helper, helper+4)
Container that stores the list of protocol versions supported.