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