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| author | Remko Tronçon <git@el-tramo.be> | 2010-02-11 12:14:00 (GMT) |
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| committer | Remko Tronçon <git@el-tramo.be> | 2010-02-11 12:14:00 (GMT) |
| commit | 0efa7c32aaf21a29b42b5926cc116007056843be (patch) | |
| tree | 882f663a5dd0e65694bf6077b71086dd77fd7ff8 /3rdParty/Boost/boost/integer/static_log2.hpp | |
| parent | 1d20eabbc32274b491b4c2bedf73d19933d97bfd (diff) | |
| download | swift-0efa7c32aaf21a29b42b5926cc116007056843be.zip swift-0efa7c32aaf21a29b42b5926cc116007056843be.tar.bz2 | |
Moved some modules into separate git modules.
Diffstat (limited to '3rdParty/Boost/boost/integer/static_log2.hpp')
| m--------- | 3rdParty/Boost | 0 | ||||
| -rw-r--r-- | 3rdParty/Boost/boost/integer/static_log2.hpp | 132 |
2 files changed, 0 insertions, 132 deletions
diff --git a/3rdParty/Boost b/3rdParty/Boost new file mode 160000 +Subproject 3bbdbc8cf1996f23d9a366da8bac0f97be6ad79 diff --git a/3rdParty/Boost/boost/integer/static_log2.hpp b/3rdParty/Boost/boost/integer/static_log2.hpp deleted file mode 100644 index 19e048b..0000000 --- a/3rdParty/Boost/boost/integer/static_log2.hpp +++ /dev/null @@ -1,132 +0,0 @@ -// -------------- Boost static_log2.hpp header file ----------------------- // -// -// Copyright (C) 2001 Daryle Walker. -// Copyright (C) 2003 Vesa Karvonen. -// Copyright (C) 2003 Gennaro Prota. -// -// 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) -// -// --------------------------------------------------- -// See http://www.boost.org/libs/integer for documentation. -// ------------------------------------------------------------------------- // - - -#ifndef BOOST_INTEGER_STATIC_LOG2_HPP -#define BOOST_INTEGER_STATIC_LOG2_HPP - -#include "boost/config.hpp" // for BOOST_STATIC_CONSTANT - -namespace boost { - - namespace detail { - - namespace static_log2_impl { - - // choose_initial_n<> - // - // Recursively doubles its integer argument, until it - // becomes >= of the "width" (C99, 6.2.6.2p4) of - // static_log2_argument_type. - // - // Used to get the maximum power of two less then the width. - // - // Example: if on your platform argument_type has 48 value - // bits it yields n=32. - // - // It's easy to prove that, starting from such a value - // of n, the core algorithm works correctly for any width - // of static_log2_argument_type and that recursion always - // terminates with x = 1 and n = 0 (see the algorithm's - // invariant). - - typedef unsigned long argument_type; - typedef int result_type; - - - template <result_type n> - struct choose_initial_n { - - enum { c = (argument_type(1) << n << n) != 0 }; - BOOST_STATIC_CONSTANT( - result_type, - value = !c*n + choose_initial_n<2*c*n>::value - ); - - }; - - template <> - struct choose_initial_n<0> { - BOOST_STATIC_CONSTANT(result_type, value = 0); - }; - - - - // start computing from n_zero - must be a power of two - const result_type n_zero = 16; - const result_type initial_n = choose_initial_n<n_zero>::value; - - // static_log2_impl<> - // - // * Invariant: - // 2n - // 1 <= x && x < 2 at the start of each recursion - // (see also choose_initial_n<>) - // - // * Type requirements: - // - // argument_type maybe any unsigned type with at least n_zero + 1 - // value bits. (Note: If larger types will be standardized -e.g. - // unsigned long long- then the argument_type typedef can be - // changed without affecting the rest of the code.) - // - - template <argument_type x, result_type n = initial_n> - struct static_log2_impl { - - enum { c = (x >> n) > 0 }; // x >= 2**n ? - BOOST_STATIC_CONSTANT( - result_type, - value = c*n + (static_log2_impl< (x>>c*n), n/2 >::value) - ); - - }; - - template <> - struct static_log2_impl<1, 0> { - BOOST_STATIC_CONSTANT(result_type, value = 0); - }; - - } - } // detail - - - - // -------------------------------------- - // static_log2<x> - // ---------------------------------------- - - typedef detail::static_log2_impl::argument_type static_log2_argument_type; - typedef detail::static_log2_impl::result_type static_log2_result_type; - - - template <static_log2_argument_type x> - struct static_log2 { - - BOOST_STATIC_CONSTANT( - static_log2_result_type, - value = detail::static_log2_impl::static_log2_impl<x>::value - ); - - }; - - - template <> - struct static_log2<0> { }; - -} - - - -#endif // include guard |