--- /dev/null
+// -*- 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
+// <http://www.gnu.org/licenses/>.
+
+// 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.
+ */
+
+#pragma GCC system_header
+
+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;
+}
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