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/************************************************************************
*
* Copyright (C) 2009-2024 IRCAD France
* Copyright (C) 2012-2019 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#pragma once
#include <core/base.hpp>
#include <algorithm>
#include <ctime>
#include <functional>
#include <mutex>
#include <random>
#include <type_traits>
namespace sight::core::tools::random
{
/**
* @brief On each invocation, it returns a random value uniformly distributed in the range [min..max).
* @param _min The "min" parameter of the distribution.
* @param _max The "max" parameter of the distribution.
* @param _seed_val Seed for generator.
* @pre min <= max
*
* @return returns a random value uniformly distributed in the range [min..max)
*/
template<typename T>
T get_value(T _min, T _max, std::uint32_t _seed_val = static_cast<std::uint32_t>(std::time(nullptr)))
{
SIGHT_ASSERT("Wrong min/max value", _min <= _max);
typedef typename std::conditional<
std::is_floating_point<T>::value,
std::uniform_real_distribution<T>,
std::uniform_int_distribution<T>
>::type distro_type;
std::mt19937 gen(_seed_val);
distro_type dist(_min, _max);
return dist(gen);
}
/**
* @brief On each invocation, this method fills specified container with random values uniformly distributed in the
* range [min..max).
* @param[in] _min The "min" parameter of the distribution.
* @param[in] _max The "max" parameter of the distribution.
* @param[out] _rand_container Container to fill with random values.
* @param[in] _seed_val Seed for generator.
* @pre min <= max
* @pre CONTAINER type same as template T
*/
template<typename T, typename CONTAINER>
void fill_container(
T _min,
T _max,
CONTAINER& _rand_container,
std::uint32_t _seed_val = static_cast<std::uint32_t>(std::time(nullptr))
)
{
SIGHT_ASSERT("Wrong min/max value", _min <= _max);
SIGHT_ASSERT("Container type not same as T", (std::is_same<T, typename CONTAINER::value_type>::value));
typedef typename std::conditional<
std::is_floating_point<T>::value,
std::uniform_real_distribution<T>,
std::uniform_int_distribution<T>
>::type distro_type;
std::mt19937 gen(_seed_val);
distro_type dist(_min, _max);
const auto generator = [&dist, &gen](auto&& ...){return dist(gen);};
std::generate(_rand_container.begin(), _rand_container.end(), generator);
}
/// This is a thread safe "std::rand" implementation
SIGHT_CORE_API int safe_rand(bool _reset = false);
} // namespace sight::core::tools::random
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