// -*- C++ -*- // Copyright (C) 2005, 2006 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, // 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 a resize size policy implementation. */ namespace detail { enum { num_distinct_sizes_32_bit = 30, num_distinct_sizes_64_bit = 62, num_distinct_sizes = sizeof(std::size_t) != 8 ? num_distinct_sizes_32_bit : num_distinct_sizes_64_bit, }; // Originally taken from the SGI implementation; acknowledged in the docs. // Further modified (for 64 bits) from tr1's hashtable. static const std::size_t g_a_sizes[num_distinct_sizes_64_bit] = { /* 0 */ 5ul, /* 1 */ 11ul, /* 2 */ 23ul, /* 3 */ 47ul, /* 4 */ 97ul, /* 5 */ 199ul, /* 6 */ 409ul, /* 7 */ 823ul, /* 8 */ 1741ul, /* 9 */ 3469ul, /* 10 */ 6949ul, /* 11 */ 14033ul, /* 12 */ 28411ul, /* 13 */ 57557ul, /* 14 */ 116731ul, /* 15 */ 236897ul, /* 16 */ 480881ul, /* 17 */ 976369ul, /* 18 */ 1982627ul, /* 19 */ 4026031ul, /* 20 */ 8175383ul, /* 21 */ 16601593ul, /* 22 */ 33712729ul, /* 23 */ 68460391ul, /* 24 */ 139022417ul, /* 25 */ 282312799ul, /* 26 */ 573292817ul, /* 27 */ 1164186217ul, /* 28 */ 2364114217ul, /* 29 */ 4294967291ul, /* 30 */ (std::size_t)8589934583ull, /* 31 */ (std::size_t)17179869143ull, /* 32 */ (std::size_t)34359738337ull, /* 33 */ (std::size_t)68719476731ull, /* 34 */ (std::size_t)137438953447ull, /* 35 */ (std::size_t)274877906899ull, /* 36 */ (std::size_t)549755813881ull, /* 37 */ (std::size_t)1099511627689ull, /* 38 */ (std::size_t)2199023255531ull, /* 39 */ (std::size_t)4398046511093ull, /* 40 */ (std::size_t)8796093022151ull, /* 41 */ (std::size_t)17592186044399ull, /* 42 */ (std::size_t)35184372088777ull, /* 43 */ (std::size_t)70368744177643ull, /* 44 */ (std::size_t)140737488355213ull, /* 45 */ (std::size_t)281474976710597ull, /* 46 */ (std::size_t)562949953421231ull, /* 47 */ (std::size_t)1125899906842597ull, /* 48 */ (std::size_t)2251799813685119ull, /* 49 */ (std::size_t)4503599627370449ull, /* 50 */ (std::size_t)9007199254740881ull, /* 51 */ (std::size_t)18014398509481951ull, /* 52 */ (std::size_t)36028797018963913ull, /* 53 */ (std::size_t)72057594037927931ull, /* 54 */ (std::size_t)144115188075855859ull, /* 55 */ (std::size_t)288230376151711717ull, /* 56 */ (std::size_t)576460752303423433ull, /* 57 */ (std::size_t)1152921504606846883ull, /* 58 */ (std::size_t)2305843009213693951ull, /* 59 */ (std::size_t)4611686018427387847ull, /* 60 */ (std::size_t)9223372036854775783ull, /* 61 */ (std::size_t)18446744073709551557ull, }; } // namespace detail PB_DS_CLASS_T_DEC inline PB_DS_CLASS_C_DEC:: hash_prime_size_policy(size_type n) : m_start_size(n) { m_start_size = get_nearest_larger_size(n); } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: swap(PB_DS_CLASS_C_DEC& other) { std::swap(m_start_size, other.m_start_size); } PB_DS_CLASS_T_DEC inline PB_DS_CLASS_C_DEC::size_type PB_DS_CLASS_C_DEC:: get_nearest_larger_size(size_type n) const { const std::size_t* const p_upper = std::upper_bound(detail::g_a_sizes, detail::g_a_sizes + detail::num_distinct_sizes, n); if (p_upper == detail::g_a_sizes + detail::num_distinct_sizes) __throw_resize_error(); return *p_upper; } PB_DS_CLASS_T_DEC inline PB_DS_CLASS_C_DEC::size_type PB_DS_CLASS_C_DEC:: get_nearest_smaller_size(size_type n) const { const size_t* p_lower = std::lower_bound(detail::g_a_sizes, detail::g_a_sizes + detail::num_distinct_sizes, n); if (*p_lower >= n && p_lower != detail::g_a_sizes) --p_lower; if (*p_lower < m_start_size) return m_start_size; return *p_lower; }