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69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2020 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef RIPPLE_BASICS_MATHUTILITIES_H_INCLUDED
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#define RIPPLE_BASICS_MATHUTILITIES_H_INCLUDED
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#include <algorithm>
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#include <cassert>
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#include <cstddef>
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namespace ripple {
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/** Calculate one number divided by another number in percentage.
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* The result is rounded up to the next integer, and capped in the range [0,100]
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* E.g. calculatePercent(1, 100) = 1 because 1/100 = 0.010000
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* calculatePercent(1, 99) = 2 because 1/99 = 0.010101
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* calculatePercent(0, 100) = 0
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* calculatePercent(100, 100) = 100
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* calculatePercent(200, 100) = 100 because the result is capped to 100
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*
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* @param count dividend
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* @param total divisor
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* @return the percentage, in [0, 100]
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*
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* @note total cannot be zero.
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* */
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constexpr std::size_t
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calculatePercent(std::size_t count, std::size_t total)
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{
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assert(total != 0);
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return ((std::min(count, total) * 100) + total - 1) / total;
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}
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// unit tests
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static_assert(calculatePercent(1, 2) == 50);
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static_assert(calculatePercent(0, 100) == 0);
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static_assert(calculatePercent(100, 100) == 100);
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static_assert(calculatePercent(200, 100) == 100);
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static_assert(calculatePercent(1, 100) == 1);
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static_assert(calculatePercent(1, 99) == 2);
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static_assert(calculatePercent(6, 14) == 43);
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static_assert(calculatePercent(29, 33) == 88);
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static_assert(calculatePercent(1, 64) == 2);
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static_assert(calculatePercent(0, 100'000'000) == 0);
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static_assert(calculatePercent(1, 100'000'000) == 1);
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static_assert(calculatePercent(50'000'000, 100'000'000) == 50);
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static_assert(calculatePercent(50'000'001, 100'000'000) == 51);
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static_assert(calculatePercent(99'999'999, 100'000'000) == 100);
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} // namespace ripple
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#endif
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