47 lines
872 B
C++
47 lines
872 B
C++
//===== Copyright © 1996-2009, Valve Corporation, All rights reserved. ======//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//===========================================================================//
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#ifndef BITTOOLS_H
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#define BITTOOLS_H
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#ifdef _WIN32
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#pragma once
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#endif
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namespace bittools
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{
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template<int N, int C = 0>
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struct RecurseBit
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{
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enum {result = RecurseBit<N/2, C+1>::result};
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};
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template<int C>
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struct RecurseBit<0, C>
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{
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enum {result = C};
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};
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template<int N, int C = 1>
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struct RecursePow2
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{
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enum {result = RecursePow2<N/2, C*2>::result};
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};
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template<int C>
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struct RecursePow2<0, C>
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{
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enum {result = C};
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};
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}
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#define ROUND_TO_POWER_OF_2( n ) ( bittools::RecursePow2< (n) - 1 >::result )
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#define MINIMUM_BITS_NEEDED( n ) ( bittools::RecurseBit< (n) - 1 >::result )
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#endif //BITTOOLS_H
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