From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- .../detail/hash_fn/mask_based_range_hashing.hpp | 107 +++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 libstdc++-v3/include/ext/pb_ds/detail/hash_fn/mask_based_range_hashing.hpp (limited to 'libstdc++-v3/include/ext/pb_ds/detail/hash_fn/mask_based_range_hashing.hpp') diff --git a/libstdc++-v3/include/ext/pb_ds/detail/hash_fn/mask_based_range_hashing.hpp b/libstdc++-v3/include/ext/pb_ds/detail/hash_fn/mask_based_range_hashing.hpp new file mode 100644 index 000000000..936abbee1 --- /dev/null +++ b/libstdc++-v3/include/ext/pb_ds/detail/hash_fn/mask_based_range_hashing.hpp @@ -0,0 +1,107 @@ +// -*- C++ -*- + +// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the terms +// of the GNU General Public License as published by the Free Software +// Foundation; either version 3, or (at your option) any later +// version. + +// This library is distributed in the hope that it will be useful, but +// WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// General Public License for more details. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// . + +// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. + +// Permission to use, copy, modify, sell, and distribute this software +// is hereby granted without fee, provided that the above copyright +// notice appears in all copies, and that both that copyright notice +// and this permission notice appear in supporting documentation. None +// of the above authors, nor IBM Haifa Research Laboratories, make any +// representation about the suitability of this software for any +// purpose. It is provided "as is" without express or implied +// warranty. + +/** + * @file mask_based_range_hashing.hpp + * Contains a range hashing policy base. + */ + +#ifndef PB_DS_MASK_BASED_RANGE_HASHING_HPP +#define PB_DS_MASK_BASED_RANGE_HASHING_HPP + +namespace __gnu_pbds +{ + namespace detail + { +#define PB_DS_CLASS_T_DEC template +#define PB_DS_CLASS_C_DEC mask_based_range_hashing + + template + class mask_based_range_hashing + { + protected: + typedef Size_Type size_type; + + void + swap(mask_based_range_hashing& other) + { std::swap(m_mask, other.m_mask); } + + void + notify_resized(size_type size); + + inline size_type + range_hash(size_type hash) const + { return size_type(hash & m_mask); } + + private: + size_type m_mask; + const static size_type s_num_bits_in_size_type; + const static size_type s_highest_bit_1; + }; + + PB_DS_CLASS_T_DEC + const typename PB_DS_CLASS_C_DEC::size_type + PB_DS_CLASS_C_DEC::s_num_bits_in_size_type = + sizeof(typename PB_DS_CLASS_C_DEC::size_type) << 3; + + PB_DS_CLASS_T_DEC + const typename PB_DS_CLASS_C_DEC::size_type PB_DS_CLASS_C_DEC::s_highest_bit_1 = static_cast(1) << (s_num_bits_in_size_type - 1); + + + PB_DS_CLASS_T_DEC + void + PB_DS_CLASS_C_DEC:: + notify_resized(size_type size) + { + size_type i = 0; + while (size ^ s_highest_bit_1) + { + size <<= 1; + ++i; + } + + m_mask = 1; + i += 2; + while (i++ < s_num_bits_in_size_type) + m_mask = (m_mask << 1) ^ 1; + } + +#undef PB_DS_CLASS_T_DEC +#undef PB_DS_CLASS_C_DEC + + } // namespace detail +} // namespace __gnu_pbds + +#endif -- cgit v1.2.3