random.hpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ANTKEEPER_MATH_RANDOM_HPP
#define ANTKEEPER_MATH_RANDOM_HPP
 
#include <cstddef>
#include <type_traits>
 
namespace math {
 
template <typename T = float>
[[nodiscard]] T random(T start, T end)
{
    static_assert(std::is_floating_point<T>::value);
    constexpr T rand_max_inverse = T(1) / static_cast<T>(RAND_MAX);
    return static_cast<T>(std::rand()) * rand_max_inverse * (end - start) + start;
}
 
} // namespace math
 
#endif // ANTKEEPER_MATH_RANDOM_HPP