2 * Copyright (c) 2014, Peter Thorson. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 * * Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 * * Redistributions in binary form must reproduce the above copyright
9 * notice, this list of conditions and the following disclaimer in the
10 * documentation and/or other materials provided with the distribution.
11 * * Neither the name of the WebSocket++ Project nor the
12 * names of its contributors may be used to endorse or promote products
13 * derived from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
22 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #ifndef WEBSOCKETPP_RANDOM_RANDOM_DEVICE_HPP
29 #define WEBSOCKETPP_RANDOM_RANDOM_DEVICE_HPP
31 #include <websocketpp/common/random.hpp>
33 namespace websocketpp {
35 /// RNG policy based on std::random_device or boost::random_device
36 namespace random_device {
38 /// Thread safe non-deterministic random integer generator.
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.
44 * Thread-safety is provided via locking based on the concurrency template
47 * Non-deterministic RNG is provided via websocketpp::lib which uses either
48 * C++11 or Boost 1.47+'s random_device class.
50 * Call operator() to generate the next number
52 template <typename int_type, typename concurrency>
55 typedef typename concurrency::scoped_lock_type scoped_lock_type;
56 typedef typename concurrency::mutex_type mutex_type;
59 //mac TODO: figure out if signed types present a range problem
62 /// advances the engine's state and returns the generated value
63 int_type operator()() {
64 scoped_lock_type guard(m_lock);
70 lib::random_device m_rng;
71 lib::uniform_int_distribution<int_type> m_dis;
76 } // namespace random_device
78 } // namespace websocketpp
80 #endif //WEBSOCKETPP_RANDOM_RANDOM_DEVICE_HPP