ESPResSo
Extensible Simulation Package for Research on Soft Matter Systems
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uniform.hpp
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1/*
2 * Copyright (C) 2018-2022 The ESPResSo project
3 *
4 * ESPResSo is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * ESPResSo is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#ifndef UTILS_UNIFORM_HPP
19#define UTILS_UNIFORM_HPP
20
21#include <cinttypes>
22#include <limits>
23
24namespace Utils {
25/**
26 * @brief Uniformly map unsigned integer to double.
27 *
28 * This maps a unsigned integer to the double interval
29 * (0., 1.], where 0 is mapped to the smallest representable
30 * value larger than 0., and the maximal integer value is
31 * mapped to 1.
32 *
33 * @param in Unsigned integer value
34 * @return Mapped floating point value.
35 */
36constexpr inline double uniform(uint64_t in) {
37 auto constexpr const max = std::numeric_limits<uint64_t>::max();
38 auto constexpr const fac = 1. / (static_cast<double>(max) + 1.);
39
40 return fac * static_cast<double>(in) + 0.5 * fac;
41}
42
43} // namespace Utils
44
45#endif // ESPRESSO_UNIFORM_HPP
constexpr double uniform(uint64_t in)
Uniformly map unsigned integer to double.
Definition uniform.hpp:36