math.hpp
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math.hpp
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	/*************************************************************************//
	*
	* \file rosa/support/math.hpp
	*
	* \author David Juhasz (david.juhasz@tuwien.ac.at)
	*
	* \date 2017
	*
	* \brief Math helpers.
	*
	******************************************************************************/

	#ifndef ROSA_SUPPORT_MATH_HPP
	#define ROSA_SUPPORT_MATH_HPP

	#include <cstdlib>

	namespace rosa {

	/// Computes log base 2 of a number.
	///
	/// \param N the number to compute log base 2 for
	///
	/// \return log base 2 of `N`
	constexpr size_t log2(const size_t N) {
	return ((N < 2) ? 1 : 1 + log2(N / 2));
	}

	} // End namespace rosa

	#endif // ROSA_SUPPORT_MATH_HPP