48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/**
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* @file : divide_round
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* @created : Saturday Feb 03, 2024 09:53:08 CST
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* @license : MIT
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**/
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#ifndef SLED_NUMERICS_DIVIDE_ROUND_H
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#define SLED_NUMERICS_DIVIDE_ROUND_H
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#pragma once
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#include <type_traits>
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namespace sled {
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template<typename Dividend, typename Divisor>
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inline auto
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DivideRoundUp(Dividend dividend, Divisor divisor) -> decltype(Dividend() / Divisor())
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{
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static_assert(std::is_integral<Dividend>(), "");
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static_assert(std::is_integral<Divisor>(), "");
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auto quotient = dividend / divisor;
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auto remainder = dividend % divisor;
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return quotient + (remainder > 0 ? 1 : 0);
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}
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template<typename Dividend, typename Divisor>
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inline auto
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DivideRoundToNearst(Dividend dividend, Divisor divisor) -> decltype(Dividend() / Divisor())
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{
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static_assert(std::is_integral<Dividend>(), "");
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static_assert(std::is_integral<Divisor>(), "");
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if (dividend < Dividend(0)) {
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auto half_of_divisor = divisor / 2;
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auto quotient = dividend / divisor;
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auto remainder = dividend % divisor;
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if (half_of_divisor < -remainder) { --quotient; }
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return quotient;
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}
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auto half_of_divisor = (divisor - 1) / 2;
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auto quotient = dividend / divisor;
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auto remainder = dividend % divisor;
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if (half_of_divisor < remainder) { ++quotient; }
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return quotient;
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}
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}// namespace sled
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#endif// SLED_NUMERICS_DIVIDE_ROUND_H
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