rippled
MathUtilities.h
1 //------------------------------------------------------------------------------
2 /*
3  This file is part of rippled: https://github.com/ripple/rippled
4  Copyright (c) 2020 Ripple Labs Inc.
5 
6  Permission to use, copy, modify, and/or distribute this software for any
7  purpose with or without fee is hereby granted, provided that the above
8  copyright notice and this permission notice appear in all copies.
9 
10  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18 //==============================================================================
19 
20 #ifndef RIPPLE_BASICS_MATHUTILITIES_H_INCLUDED
21 #define RIPPLE_BASICS_MATHUTILITIES_H_INCLUDED
22 
23 #include <algorithm>
24 #include <cassert>
25 #include <cstddef>
26 
27 namespace ripple {
28 
43 constexpr std::size_t
44 calculatePercent(std::size_t count, std::size_t total)
45 {
46  assert(total != 0);
47  return ((std::min(count, total) * 100) + total - 1) / total;
48 }
49 
50 // unit tests
51 static_assert(calculatePercent(1, 2) == 50);
52 static_assert(calculatePercent(0, 100) == 0);
53 static_assert(calculatePercent(100, 100) == 100);
54 static_assert(calculatePercent(200, 100) == 100);
55 static_assert(calculatePercent(1, 100) == 1);
56 static_assert(calculatePercent(1, 99) == 2);
57 static_assert(calculatePercent(6, 14) == 43);
58 static_assert(calculatePercent(29, 33) == 88);
59 static_assert(calculatePercent(1, 64) == 2);
60 static_assert(calculatePercent(0, 100'000'000) == 0);
61 static_assert(calculatePercent(1, 100'000'000) == 1);
62 static_assert(calculatePercent(50'000'000, 100'000'000) == 50);
63 static_assert(calculatePercent(50'000'001, 100'000'000) == 51);
64 static_assert(calculatePercent(99'999'999, 100'000'000) == 100);
65 
66 } // namespace ripple
67 
68 #endif
algorithm
cstddef
ripple::calculatePercent
constexpr std::size_t calculatePercent(std::size_t count, std::size_t total)
Calculate one number divided by another number in percentage.
Definition: MathUtilities.h:44
std::min
T min(T... args)
ripple
Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.
Definition: RCLCensorshipDetector.h:29
cassert
std::size_t
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