diff options
Diffstat (limited to 'libstdc++-v3/include/ext/pb_assoc/detail/resize_policy/hash_prime_size_policy_imp.hpp')
| -rw-r--r-- | libstdc++-v3/include/ext/pb_assoc/detail/resize_policy/hash_prime_size_policy_imp.hpp | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/libstdc++-v3/include/ext/pb_assoc/detail/resize_policy/hash_prime_size_policy_imp.hpp b/libstdc++-v3/include/ext/pb_assoc/detail/resize_policy/hash_prime_size_policy_imp.hpp new file mode 100644 index 00000000000..153b0efb939 --- /dev/null +++ b/libstdc++-v3/include/ext/pb_assoc/detail/resize_policy/hash_prime_size_policy_imp.hpp @@ -0,0 +1,150 @@ +// -*- C++ -*- + +// Copyright (C) 2005 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 2, 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. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +// 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 hash_prime_size_policy_imp.hpp + * Contains an implementation of hash_prime_size_policy. + */ + +namespace detail +{ + + enum + { + num_distinct_sizes = 28 + }; + + static const size_t s_a_sizes[num_distinct_sizes] = + { + /* Dealing cards... */ + /* 0 */ 53ul, + /* 1 */ 97ul, + /* 2 */ 193ul, + /* 3 */ 389ul, + /* 4 */ 769ul, + /* 5 */ 1543ul, + /* 6 */ 3079ul, + /* 7 */ 6151ul, + /* 8 */ 12289ul, + /* 9 */ 24593ul, + /* 10 */ 49157ul, + /* 11 */ 98317ul, + /* 12 */ 196613ul, + /* 13 */ 393241ul, + /* 14 */ 786433ul, + /* 15 */ 1572869ul, + /* 16 */ 3145739ul, + /* 17 */ 6291469ul, + /* 18 */ 12582917ul, + /* 19 */ 25165843ul, + /* 20 */ 50331653ul, + /* 21 */ 100663319ul, + /* 22 */ 201326611ul, + /* 23 */ 402653189ul, + /* 24 */ 805306457ul, + /* 25 */ 1610612741, + /* 26 */ 3221225473ul, + /* 27 */ 4294967291ul + /* Pot's good, let's play */ + }; + +} // namespace detail + +PB_ASSOC_CLASS_T_DEC +inline void +PB_ASSOC_CLASS_C_DEC:: +swap(PB_ASSOC_CLASS_C_DEC& /*r_other*/) +{ } + +PB_ASSOC_CLASS_T_DEC +PB_ASSOC_CLASS_C_DEC::size_type +PB_ASSOC_CLASS_C_DEC:: +get_init_size(size_type suggested_size) const +{ + return (get_nearest_larger_size_imp(suggested_size)); +} + +PB_ASSOC_CLASS_T_DEC +inline PB_ASSOC_CLASS_C_DEC::size_type +PB_ASSOC_CLASS_C_DEC:: +get_nearest_larger_size(size_type cur_size) const +{ + PB_ASSOC_DBG_ONLY(assert_is_one_of_my_sizes(cur_size);) + + return (get_nearest_larger_size_imp(cur_size)); +} + +PB_ASSOC_CLASS_T_DEC +inline PB_ASSOC_CLASS_C_DEC::size_type +PB_ASSOC_CLASS_C_DEC:: +get_nearest_smaller_size(size_type cur_size) const +{ + PB_ASSOC_DBG_ONLY(assert_is_one_of_my_sizes(cur_size);) + + return (*std::lower_bound(detail::s_a_sizes, detail::s_a_sizes + detail::num_distinct_sizes, cur_size - 1)); +} + +PB_ASSOC_CLASS_T_DEC +inline PB_ASSOC_CLASS_C_DEC::size_type +PB_ASSOC_CLASS_C_DEC:: +get_nearest_larger_size_imp(size_type size) const +{ + const size_t* const p_upper = + std::upper_bound(detail::s_a_sizes, detail::s_a_sizes + detail::num_distinct_sizes, size); + + return ((p_upper == detail::s_a_sizes + detail::num_distinct_sizes)? + size : + *p_upper); +} + +#ifdef PB_ASSOC_HT_PRIME_SIZE_POLICY_DEBUG +PB_ASSOC_CLASS_T_DEC +void +PB_ASSOC_CLASS_C_DEC:: +assert_is_one_of_my_sizes(size_type size) +{ + const size_t* const p_end = + detail::s_a_sizes + detail::num_distinct_sizes; + + const size_t* const p_found = + std::find(detail::s_a_sizes, p_end, size) + + PB_ASSOC_DBG_ASSERT(p_found != p_end); +} +#endif // #ifdef PB_ASSOC_HT_PRIME_SIZE_POLICY_DEBUG |