💿🐜 Antkeeper source code
https://antkeeper.com
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50 lines
1.5 KiB
50 lines
1.5 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_MATH_RANDOM_HPP
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#define ANTKEEPER_MATH_RANDOM_HPP
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#include <cstdlib>
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#include <type_traits>
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namespace math {
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/**
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* Generates a pseudo-random floating point number on `[start, end)` using std::rand().
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*
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* @warning Don't forget to seed with std::srand() before using!
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*
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* @param start Start of the range (inclusive).
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* @param end End of the range (exclusive).
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* @return Pseudo-random floating point number.
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*/
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template <typename T = float>
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T random(T start, T end);
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template <typename T>
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inline T random(T start, T end)
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{
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static_assert(std::is_floating_point<T>::value);
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constexpr T rand_max_inverse = T(1) / static_cast<T>(RAND_MAX);
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return static_cast<T>(std::rand()) * rand_max_inverse * (end - start) + start;
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}
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} // namespace math
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#endif // ANTKEEPER_MATH_RANDOM_HPP
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