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AK: Introduce IntegralMath.h starting with pow<I>

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Hendiadyoin1 2022-01-27 13:22:23 +01:00 committed by Brian Gianforcaro
parent 64f135d90f
commit 581c23dc55
3 changed files with 56 additions and 0 deletions

35
AK/IntegralMath.h Normal file
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/*
* Copyright (c) 2022, Leon Albrecht <leon2002.la@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Concepts.h>
#include <AK/Types.h>
#include <AK/Format.h>
namespace AK {
template<Integral I>
constexpr I pow(I base, I exponent)
{
// https://en.wikipedia.org/wiki/Exponentiation_by_squaring
if (exponent < 0)
return 0;
if (exponent == 0)
return 1;
I res = 1;
while (exponent > 0) {
if (exponent & 1)
res *= base;
base *= base;
exponent /= 2u;
}
return res;
}
}