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Rearrange sources (#4997)

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2024-06-20 09:22:15 -05:00
committed by John Freeman
parent 2e902dee53
commit e416ee72ca
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include/xrpl/basics/MathUtilities.h Normal file
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//------------------------------------------------------------------------------
/*
This file is part of rippled: https://github.com/ripple/rippled
Copyright (c) 2020 Ripple Labs Inc.
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
#ifndef RIPPLE_BASICS_MATHUTILITIES_H_INCLUDED
#define RIPPLE_BASICS_MATHUTILITIES_H_INCLUDED
#include <algorithm>
#include <cassert>
#include <cstddef>
namespace ripple {
/** Calculate one number divided by another number in percentage.
* The result is rounded up to the next integer, and capped in the range [0,100]
* E.g. calculatePercent(1, 100) = 1 because 1/100 = 0.010000
* calculatePercent(1, 99) = 2 because 1/99 = 0.010101
* calculatePercent(0, 100) = 0
* calculatePercent(100, 100) = 100
* calculatePercent(200, 100) = 100 because the result is capped to 100
*
* @param count dividend
* @param total divisor
* @return the percentage, in [0, 100]
*
* @note total cannot be zero.
* */
constexpr std::size_t
calculatePercent(std::size_t count, std::size_t total)
{
assert(total != 0);
return ((std::min(count, total) * 100) + total - 1) / total;
}
// unit tests
static_assert(calculatePercent(1, 2) == 50);
static_assert(calculatePercent(0, 100) == 0);
static_assert(calculatePercent(100, 100) == 100);
static_assert(calculatePercent(200, 100) == 100);
static_assert(calculatePercent(1, 100) == 1);
static_assert(calculatePercent(1, 99) == 2);
static_assert(calculatePercent(6, 14) == 43);
static_assert(calculatePercent(29, 33) == 88);
static_assert(calculatePercent(1, 64) == 2);
static_assert(calculatePercent(0, 100'000'000) == 0);
static_assert(calculatePercent(1, 100'000'000) == 1);
static_assert(calculatePercent(50'000'000, 100'000'000) == 50);
static_assert(calculatePercent(50'000'001, 100'000'000) == 51);
static_assert(calculatePercent(99'999'999, 100'000'000) == 100);
} // namespace ripple
#endif