UnrealEngineUWP/Engine/Source/Developer/Windows/LiveCoding/Private/External/LC_BitUtil.h

// Copyright 2011-2019 Molecular Matters GmbH, all rights reserved.

#pragma once

#include <type_traits>
#pragma intrinsic(_BitScanReverse)


namespace bitUtil
{
	template <typename T>
	inline T RoundUpToMultiple(T numToRound, T multipleOf)
	{
		static_assert(std::is_unsigned<T>::value == true, "T must be an unsigned type.");
		return (numToRound + (multipleOf - 1u)) & ~(multipleOf - 1u);
	}


	// http://www.graphics.stanford.edu/~seander/bithacks.html#DetermineIfPowerOf2
	template <typename T>
	inline bool IsPowerOfTwo(T value)
	{
		static_assert(std::is_unsigned<T>::value == true, "T must be an unsigned type.");
		return value && !(value & (value - 1u));
	}

	// Finds the first set bit, searching from MSB to LSB.
	// Can be used to determine the log2 of integers that are powers of two.
	inline uint32_t BitScanReverse(uint32_t value)
	{
		DWORD index = 0u;
		::_BitScanReverse(&index, value);
		return index;
	}
}