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integer_log2.hpp - Hosted on DriveHQ Cloud IT Platform
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Ruta de la carpeta: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\pending\integer_log2.hpp
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// ------------------------------------- // integer_log2.hpp // // Gives the integer part of the logarithm, in base 2, of a // given number. Behavior is undefined if the argument is <= 0. // // // (C) Copyright Gennaro Prota 2003 - 2004. // // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // // ------------------------------------------------------ // // $Id: integer_log2.hpp 41369 2007-11-25 18:07:19Z bemandawes $ #ifndef BOOST_INTEGER_LOG2_HPP_GP_20030301 #define BOOST_INTEGER_LOG2_HPP_GP_20030301 #include
#ifdef __BORLANDC__ #include
#endif #include "boost/limits.hpp" #include "boost/config.hpp" namespace boost { namespace detail { template
int integer_log2_impl(T x, int n) { int result = 0; while (x != 1) { const T t = x >> n; if (t) { result += n; x = t; } n /= 2; } return result; } // helper to find the maximum power of two // less than p (more involved than necessary, // to avoid PTS) // template
struct max_pow2_less { enum { c = 2*n < p }; BOOST_STATIC_CONSTANT(int, value = c ? (max_pow2_less< c*p, 2*c*n>::value) : n); }; template <> struct max_pow2_less<0, 0> { BOOST_STATIC_CONSTANT(int, value = 0); }; // this template is here just for Borland :( // we could simply rely on numeric_limits but sometimes // Borland tries to use numeric_limits
, because // of its usual const-related problems in argument deduction // - gps template
struct width { #ifdef __BORLANDC__ BOOST_STATIC_CONSTANT(int, value = sizeof(T) * CHAR_BIT); #else BOOST_STATIC_CONSTANT(int, value = (std::numeric_limits
::digits)); #endif }; } // detail // --------- // integer_log2 // --------------- // template
int integer_log2(T x) { assert(x > 0); const int n = detail::max_pow2_less< detail::width
:: value, 4 > :: value; return detail::integer_log2_impl(x, n); } } #endif // include guard
integer_log2.hpp
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