commit/90efe5eaddc63df3c0a93049b066950c49dbd27e/MathUtilities_8h_source.html

#pragma once


#include <algorithm>

#include <cassert>

#include <cstddef>


namespace xrpl {


constexpr std::size_t


calculatePercent(std::size_t count, std::size_t total)

{

    assert(total != 0);  // NOTE No XRPL_ASSERT here, because constexpr

    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 xrpl

algorithm

cassert

cstddef

std::min
T min(T... args)

xrpl
Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.
Definition algorithm.h:5

xrpl::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:24

std::size_t