💿🐜 Antkeeper source code https://antkeeper.com
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/*
* Copyright (C) 2021 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 <cstdlib>
#include <type_traits>
namespace math {
/**
* Generates a pseudo-random floating point number on `[start, end)` using std::rand().
*
* @warning Don't forget to seed with std::srand() before using!
*
* @param start Start of the range (inclusive).
* @param end End of the range (exclusive).
* @return Pseudo-random floating point number.
*/
template <typename T = float>
T random(T start, T end);
template <typename T>
inline 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