i6eRandom.h

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/*
 Copyright (2016) Michael Baer, Daniel Bonrath, All rights reserved.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

#ifndef __M2ETIS_UTILS_RANDOM_H__
#define __M2ETIS_UTILS_RANDOM_H__

#include <cmath>
#include <random>

#include "m2etis/util/Exceptions.h"

#include "boost/date_time.hpp"
#include "boost/thread/mutex.hpp"

namespace m2etis {
namespace util {

        class Random {
        public:
                static unsigned int rand() {
                        boost::mutex::scoped_lock l(lock);
                        return random.getRand();
                }

                static unsigned int rand(unsigned int max) {
                        if (max == 0) {
                                M2ETIS_THROW_API("i6eRandom", "max value has to be grater than zero")
                        }
                        return rand() % max;
                }

                static unsigned int rand(unsigned int min, unsigned int max) {
                        if (min >= max) {
                                M2ETIS_THROW_API("i6eRandom", "max value has to be greater than min value")
                        }
                        return (rand() % (max - min)) + min;
                }

        private:
                static Random random;

                std::minstd_rand * _linear;

                static boost::mutex lock;

                Random() : _linear(new std::minstd_rand(17)) {
                }

                ~Random() {
                        delete _linear;
                }

                unsigned int getRand() { return (*_linear)(); }
        };

} /* namespace util */
} /* namespace m2etis */

#endif /* __M2ETIS_UTILS_RANDOM_H__ */