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81 lines
3.1 KiB
C++
81 lines
3.1 KiB
C++
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/*
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* Copyright (c) 2014, Peter Thorson. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the WebSocket++ Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef WEBSOCKETPP_RANDOM_RANDOM_DEVICE_HPP
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#define WEBSOCKETPP_RANDOM_RANDOM_DEVICE_HPP
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#include <websocketpp/common/random.hpp>
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namespace websocketpp {
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namespace random {
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/// RNG policy based on std::random_device or boost::random_device
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namespace random_device {
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/// Thread safe non-deterministic random integer generator.
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/**
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* This template class provides thread safe non-deterministic random integer
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* generation. Numbers are produced in a uniformly distributed range from the
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* smallest to largest value that int_type can store.
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*
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* Thread-safety is provided via locking based on the concurrency template
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* parameter.
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*
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* Non-deterministic RNG is provided via websocketpp::lib which uses either
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* C++11 or Boost 1.47+'s random_device class.
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*
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* Call operator() to generate the next number
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*/
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template <typename int_type, typename concurrency>
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class int_generator {
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public:
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typedef typename concurrency::scoped_lock_type scoped_lock_type;
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typedef typename concurrency::mutex_type mutex_type;
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/// constructor
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//mac TODO: figure out if signed types present a range problem
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int_generator() {}
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/// advances the engine's state and returns the generated value
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int_type operator()() {
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scoped_lock_type guard(m_lock);
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return m_dis(m_rng);
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}
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private:
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lib::random_device m_rng;
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lib::uniform_int_distribution<int_type> m_dis;
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mutex_type m_lock;
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};
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} // namespace random_device
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} // namespace random
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} // namespace websocketpp
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#endif //WEBSOCKETPP_RANDOM_RANDOM_DEVICE_HPP
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