46db415941
2006-10-17 Benjamin Kosnik <bkoz@redhat.com> PR libstdc++/28514 * include/bits/cpp_type_traits.h (__detail): Uglify namespace. * include/ext/rope: Remove global-scope anonymous namespace, use nested __detail. Fixup resulting formatting issues. * include/ext/ropeimpl.h: Same. * include/tr1/hashtable_policy.h: Remove anonymous namespace nesting for __detail. * include/tr1/random: Revert anonymous namespace to nested __detail namespace. * include/tr1/random.tcc: Same. * src/ext-inst.cc: Fixups for above. From-SVN: r117824
904 lines
31 KiB
C++
904 lines
31 KiB
C++
// Internal policy header for TR1 unordered_set and unordered_map -*- C++ -*-
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// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file
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* This is a TR1 C++ Library header.
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*/
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#ifndef _TR1_HASHTABLE_POLICY_H
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#define _TR1_HASHTABLE_POLICY_H 1
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#include <functional> // _Identity, _Select1st
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#include <tr1/utility>
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#include <ext/type_traits.h>
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namespace std
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{
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_GLIBCXX_BEGIN_NAMESPACE(tr1)
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namespace __detail
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{
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// Helper function: return distance(first, last) for forward
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// iterators, or 0 for input iterators.
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template<class _Iterator>
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inline typename std::iterator_traits<_Iterator>::difference_type
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__distance_fw(_Iterator __first, _Iterator __last,
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std::input_iterator_tag)
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{ return 0; }
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template<class _Iterator>
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inline typename std::iterator_traits<_Iterator>::difference_type
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__distance_fw(_Iterator __first, _Iterator __last,
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std::forward_iterator_tag)
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{ return std::distance(__first, __last); }
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template<class _Iterator>
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inline typename std::iterator_traits<_Iterator>::difference_type
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__distance_fw(_Iterator __first, _Iterator __last)
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{
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typedef typename std::iterator_traits<_Iterator>::iterator_category _Tag;
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return __distance_fw(__first, __last, _Tag());
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}
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// XXX This is a hack. _Prime_rehash_policy's member functions, and
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// certainly the list of primes, should be defined in a .cc file.
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// We're temporarily putting them in a header because we don't have a
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// place to put TR1 .cc files yet. There's no good reason for any of
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// _Prime_rehash_policy's member functions to be inline, and there's
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// certainly no good reason for _Primes<> to exist at all.
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struct _LessThan
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{
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template<typename _Tp, typename _Up>
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bool
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operator()(_Tp __x, _Up __y)
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{ return __x < __y; }
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};
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template<int __ulongsize = sizeof(unsigned long)>
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struct _Primes
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{
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static const int __n_primes = __ulongsize != 8 ? 256 : 256 + 48;
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static const unsigned long __primes[256 + 48 + 1];
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};
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template<int __ulongsize>
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const int _Primes<__ulongsize>::__n_primes;
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template<int __ulongsize>
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const unsigned long _Primes<__ulongsize>::__primes[256 + 48 + 1] =
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{
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2ul, 3ul, 5ul, 7ul, 11ul, 13ul, 17ul, 19ul, 23ul, 29ul, 31ul,
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37ul, 41ul, 43ul, 47ul, 53ul, 59ul, 61ul, 67ul, 71ul, 73ul, 79ul,
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83ul, 89ul, 97ul, 103ul, 109ul, 113ul, 127ul, 137ul, 139ul, 149ul,
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157ul, 167ul, 179ul, 193ul, 199ul, 211ul, 227ul, 241ul, 257ul,
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277ul, 293ul, 313ul, 337ul, 359ul, 383ul, 409ul, 439ul, 467ul,
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503ul, 541ul, 577ul, 619ul, 661ul, 709ul, 761ul, 823ul, 887ul,
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953ul, 1031ul, 1109ul, 1193ul, 1289ul, 1381ul, 1493ul, 1613ul,
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1741ul, 1879ul, 2029ul, 2179ul, 2357ul, 2549ul, 2753ul, 2971ul,
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3209ul, 3469ul, 3739ul, 4027ul, 4349ul, 4703ul, 5087ul, 5503ul,
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5953ul, 6427ul, 6949ul, 7517ul, 8123ul, 8783ul, 9497ul, 10273ul,
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11113ul, 12011ul, 12983ul, 14033ul, 15173ul, 16411ul, 17749ul,
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19183ul, 20753ul, 22447ul, 24281ul, 26267ul, 28411ul, 30727ul,
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33223ul, 35933ul, 38873ul, 42043ul, 45481ul, 49201ul, 53201ul,
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57557ul, 62233ul, 67307ul, 72817ul, 78779ul, 85229ul, 92203ul,
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99733ul, 107897ul, 116731ul, 126271ul, 136607ul, 147793ul,
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159871ul, 172933ul, 187091ul, 202409ul, 218971ul, 236897ul,
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256279ul, 277261ul, 299951ul, 324503ul, 351061ul, 379787ul,
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410857ul, 444487ul, 480881ul, 520241ul, 562841ul, 608903ul,
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658753ul, 712697ul, 771049ul, 834181ul, 902483ul, 976369ul,
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1056323ul, 1142821ul, 1236397ul, 1337629ul, 1447153ul, 1565659ul,
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1693859ul, 1832561ul, 1982627ul, 2144977ul, 2320627ul, 2510653ul,
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2716249ul, 2938679ul, 3179303ul, 3439651ul, 3721303ul, 4026031ul,
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4355707ul, 4712381ul, 5098259ul, 5515729ul, 5967347ul, 6456007ul,
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6984629ul, 7556579ul, 8175383ul, 8844859ul, 9569143ul, 10352717ul,
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11200489ul, 12117689ul, 13109983ul, 14183539ul, 15345007ul,
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16601593ul, 17961079ul, 19431899ul, 21023161ul, 22744717ul,
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24607243ul, 26622317ul, 28802401ul, 31160981ul, 33712729ul,
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36473443ul, 39460231ul, 42691603ul, 46187573ul, 49969847ul,
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54061849ul, 58488943ul, 63278561ul, 68460391ul, 74066549ul,
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80131819ul, 86693767ul, 93793069ul, 101473717ul, 109783337ul,
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118773397ul, 128499677ul, 139022417ul, 150406843ul, 162723577ul,
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176048909ul, 190465427ul, 206062531ul, 222936881ul, 241193053ul,
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260944219ul, 282312799ul, 305431229ul, 330442829ul, 357502601ul,
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386778277ul, 418451333ul, 452718089ul, 489790921ul, 529899637ul,
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573292817ul, 620239453ul, 671030513ul, 725980837ul, 785430967ul,
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849749479ul, 919334987ul, 994618837ul, 1076067617ul, 1164186217ul,
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1259520799ul, 1362662261ul, 1474249943ul, 1594975441ul,
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1725587117ul, 1866894511ul, 2019773507ul, 2185171673ul,
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2364114217ul, 2557710269ul, 2767159799ul, 2993761039ul,
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3238918481ul, 3504151727ul, 3791104843ul, 4101556399ul,
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4294967291ul,
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// Sentinel, so we don't have to test the result of lower_bound,
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// or, on 64-bit machines, rest of the table.
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__ulongsize != 8 ? 4294967291ul : (unsigned long)6442450933ull,
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(unsigned long)8589934583ull,
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(unsigned long)12884901857ull, (unsigned long)17179869143ull,
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(unsigned long)25769803693ull, (unsigned long)34359738337ull,
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(unsigned long)51539607367ull, (unsigned long)68719476731ull,
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(unsigned long)103079215087ull, (unsigned long)137438953447ull,
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(unsigned long)206158430123ull, (unsigned long)274877906899ull,
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(unsigned long)412316860387ull, (unsigned long)549755813881ull,
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(unsigned long)824633720731ull, (unsigned long)1099511627689ull,
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(unsigned long)1649267441579ull, (unsigned long)2199023255531ull,
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(unsigned long)3298534883309ull, (unsigned long)4398046511093ull,
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(unsigned long)6597069766607ull, (unsigned long)8796093022151ull,
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(unsigned long)13194139533241ull, (unsigned long)17592186044399ull,
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(unsigned long)26388279066581ull, (unsigned long)35184372088777ull,
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(unsigned long)52776558133177ull, (unsigned long)70368744177643ull,
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(unsigned long)105553116266399ull, (unsigned long)140737488355213ull,
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(unsigned long)211106232532861ull, (unsigned long)281474976710597ull,
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(unsigned long)562949953421231ull, (unsigned long)1125899906842597ull,
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(unsigned long)2251799813685119ull, (unsigned long)4503599627370449ull,
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(unsigned long)9007199254740881ull, (unsigned long)18014398509481951ull,
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(unsigned long)36028797018963913ull, (unsigned long)72057594037927931ull,
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(unsigned long)144115188075855859ull,
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(unsigned long)288230376151711717ull,
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(unsigned long)576460752303423433ull,
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(unsigned long)1152921504606846883ull,
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(unsigned long)2305843009213693951ull,
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(unsigned long)4611686018427387847ull,
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(unsigned long)9223372036854775783ull,
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(unsigned long)18446744073709551557ull,
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(unsigned long)18446744073709551557ull
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};
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// Auxiliary types used for all instantiations of _Hashtable: nodes
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// and iterators.
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// Nodes, used to wrap elements stored in the hash table. A policy
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// template parameter of class template _Hashtable controls whether
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// nodes also store a hash code. In some cases (e.g. strings) this
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// may be a performance win.
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template<typename _Value, bool __cache_hash_code>
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struct _Hash_node;
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template<typename _Value>
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struct _Hash_node<_Value, true>
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{
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_Value _M_v;
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std::size_t _M_hash_code;
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_Hash_node* _M_next;
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};
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template<typename _Value>
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struct _Hash_node<_Value, false>
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{
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_Value _M_v;
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_Hash_node* _M_next;
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};
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// Local iterators, used to iterate within a bucket but not between
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// buckets.
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template<typename _Value, bool __cache>
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struct _Node_iterator_base
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{
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_Node_iterator_base(_Hash_node<_Value, __cache>* __p)
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: _M_cur(__p) { }
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void
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_M_incr()
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{ _M_cur = _M_cur->_M_next; }
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_Hash_node<_Value, __cache>* _M_cur;
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};
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template<typename _Value, bool __cache>
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inline bool
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operator==(const _Node_iterator_base<_Value, __cache>& __x,
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const _Node_iterator_base<_Value, __cache>& __y)
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{ return __x._M_cur == __y._M_cur; }
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template<typename _Value, bool __cache>
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inline bool
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operator!=(const _Node_iterator_base<_Value, __cache>& __x,
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const _Node_iterator_base<_Value, __cache>& __y)
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{ return __x._M_cur != __y._M_cur; }
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template<typename _Value, bool __constant_iterators, bool __cache>
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struct _Node_iterator
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: public _Node_iterator_base<_Value, __cache>
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{
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typedef _Value value_type;
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typedef typename
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__gnu_cxx::__conditional_type<__constant_iterators,
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const _Value*, _Value*>::__type
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pointer;
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typedef typename
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__gnu_cxx::__conditional_type<__constant_iterators,
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const _Value&, _Value&>::__type
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reference;
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typedef std::ptrdiff_t difference_type;
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typedef std::forward_iterator_tag iterator_category;
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_Node_iterator()
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: _Node_iterator_base<_Value, __cache>(0) { }
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explicit
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_Node_iterator(_Hash_node<_Value, __cache>* __p)
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: _Node_iterator_base<_Value, __cache>(__p) { }
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reference
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operator*() const
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{ return this->_M_cur->_M_v; }
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pointer
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operator->() const
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{ return &this->_M_cur->_M_v; }
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_Node_iterator&
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operator++()
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{
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this->_M_incr();
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return *this;
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}
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_Node_iterator
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operator++(int)
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{
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_Node_iterator __tmp(*this);
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this->_M_incr();
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return __tmp;
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}
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};
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template<typename _Value, bool __constant_iterators, bool __cache>
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struct _Node_const_iterator
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: public _Node_iterator_base<_Value, __cache>
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{
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typedef _Value value_type;
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typedef const _Value* pointer;
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typedef const _Value& reference;
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typedef std::ptrdiff_t difference_type;
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typedef std::forward_iterator_tag iterator_category;
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_Node_const_iterator()
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: _Node_iterator_base<_Value, __cache>(0) { }
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explicit
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_Node_const_iterator(_Hash_node<_Value, __cache>* __p)
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: _Node_iterator_base<_Value, __cache>(__p) { }
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_Node_const_iterator(const _Node_iterator<_Value, __constant_iterators,
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__cache>& __x)
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: _Node_iterator_base<_Value, __cache>(__x._M_cur) { }
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reference
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operator*() const
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{ return this->_M_cur->_M_v; }
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pointer
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operator->() const
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{ return &this->_M_cur->_M_v; }
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_Node_const_iterator&
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operator++()
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{
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this->_M_incr();
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return *this;
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}
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_Node_const_iterator
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operator++(int)
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{
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_Node_const_iterator __tmp(*this);
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this->_M_incr();
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return __tmp;
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}
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};
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template<typename _Value, bool __cache>
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struct _Hashtable_iterator_base
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{
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_Hashtable_iterator_base(_Hash_node<_Value, __cache>* __node,
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_Hash_node<_Value, __cache>** __bucket)
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: _M_cur_node(__node), _M_cur_bucket(__bucket) { }
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void
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_M_incr()
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{
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_M_cur_node = _M_cur_node->_M_next;
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if (!_M_cur_node)
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_M_incr_bucket();
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}
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void
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_M_incr_bucket();
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_Hash_node<_Value, __cache>* _M_cur_node;
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_Hash_node<_Value, __cache>** _M_cur_bucket;
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};
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// Global iterators, used for arbitrary iteration within a hash
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// table. Larger and more expensive than local iterators.
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template<typename _Value, bool __cache>
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void
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_Hashtable_iterator_base<_Value, __cache>::
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_M_incr_bucket()
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{
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++_M_cur_bucket;
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// This loop requires the bucket array to have a non-null sentinel.
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while (!*_M_cur_bucket)
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++_M_cur_bucket;
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_M_cur_node = *_M_cur_bucket;
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}
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template<typename _Value, bool __cache>
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inline bool
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operator==(const _Hashtable_iterator_base<_Value, __cache>& __x,
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const _Hashtable_iterator_base<_Value, __cache>& __y)
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{ return __x._M_cur_node == __y._M_cur_node; }
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template<typename _Value, bool __cache>
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inline bool
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operator!=(const _Hashtable_iterator_base<_Value, __cache>& __x,
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const _Hashtable_iterator_base<_Value, __cache>& __y)
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{ return __x._M_cur_node != __y._M_cur_node; }
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template<typename _Value, bool __constant_iterators, bool __cache>
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struct _Hashtable_iterator
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: public _Hashtable_iterator_base<_Value, __cache>
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{
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typedef _Value value_type;
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typedef typename
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__gnu_cxx::__conditional_type<__constant_iterators,
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const _Value*, _Value*>::__type
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pointer;
|
|
typedef typename
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__gnu_cxx::__conditional_type<__constant_iterators,
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const _Value&, _Value&>::__type
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reference;
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typedef std::ptrdiff_t difference_type;
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typedef std::forward_iterator_tag iterator_category;
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_Hashtable_iterator()
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: _Hashtable_iterator_base<_Value, __cache>(0, 0) { }
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_Hashtable_iterator(_Hash_node<_Value, __cache>* __p,
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_Hash_node<_Value, __cache>** __b)
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: _Hashtable_iterator_base<_Value, __cache>(__p, __b) { }
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explicit
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_Hashtable_iterator(_Hash_node<_Value, __cache>** __b)
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: _Hashtable_iterator_base<_Value, __cache>(*__b, __b) { }
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reference
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operator*() const
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{ return this->_M_cur_node->_M_v; }
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pointer
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operator->() const
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{ return &this->_M_cur_node->_M_v; }
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_Hashtable_iterator&
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operator++()
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{
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this->_M_incr();
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return *this;
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}
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_Hashtable_iterator
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|
operator++(int)
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|
{
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_Hashtable_iterator __tmp(*this);
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this->_M_incr();
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return __tmp;
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}
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};
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template<typename _Value, bool __constant_iterators, bool __cache>
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|
struct _Hashtable_const_iterator
|
|
: public _Hashtable_iterator_base<_Value, __cache>
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|
{
|
|
typedef _Value value_type;
|
|
typedef const _Value* pointer;
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|
typedef const _Value& reference;
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|
typedef std::ptrdiff_t difference_type;
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typedef std::forward_iterator_tag iterator_category;
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_Hashtable_const_iterator()
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: _Hashtable_iterator_base<_Value, __cache>(0, 0) { }
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_Hashtable_const_iterator(_Hash_node<_Value, __cache>* __p,
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_Hash_node<_Value, __cache>** __b)
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: _Hashtable_iterator_base<_Value, __cache>(__p, __b) { }
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explicit
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|
_Hashtable_const_iterator(_Hash_node<_Value, __cache>** __b)
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: _Hashtable_iterator_base<_Value, __cache>(*__b, __b) { }
|
|
|
|
_Hashtable_const_iterator(const _Hashtable_iterator<_Value,
|
|
__constant_iterators, __cache>& __x)
|
|
: _Hashtable_iterator_base<_Value, __cache>(__x._M_cur_node,
|
|
__x._M_cur_bucket) { }
|
|
|
|
reference
|
|
operator*() const
|
|
{ return this->_M_cur_node->_M_v; }
|
|
|
|
pointer
|
|
operator->() const
|
|
{ return &this->_M_cur_node->_M_v; }
|
|
|
|
_Hashtable_const_iterator&
|
|
operator++()
|
|
{
|
|
this->_M_incr();
|
|
return *this;
|
|
}
|
|
|
|
_Hashtable_const_iterator
|
|
operator++(int)
|
|
{
|
|
_Hashtable_const_iterator __tmp(*this);
|
|
this->_M_incr();
|
|
return __tmp;
|
|
}
|
|
};
|
|
|
|
|
|
// Many of class template _Hashtable's template parameters are policy
|
|
// classes. These are defaults for the policies.
|
|
|
|
// Default range hashing function: use division to fold a large number
|
|
// into the range [0, N).
|
|
struct _Mod_range_hashing
|
|
{
|
|
typedef std::size_t first_argument_type;
|
|
typedef std::size_t second_argument_type;
|
|
typedef std::size_t result_type;
|
|
|
|
result_type
|
|
operator()(first_argument_type __num, second_argument_type __den) const
|
|
{ return __num % __den; }
|
|
};
|
|
|
|
// Default ranged hash function H. In principle it should be a
|
|
// function object composed from objects of type H1 and H2 such that
|
|
// h(k, N) = h2(h1(k), N), but that would mean making extra copies of
|
|
// h1 and h2. So instead we'll just use a tag to tell class template
|
|
// hashtable to do that composition.
|
|
struct _Default_ranged_hash { };
|
|
|
|
// Default value for rehash policy. Bucket size is (usually) the
|
|
// smallest prime that keeps the load factor small enough.
|
|
struct _Prime_rehash_policy
|
|
{
|
|
_Prime_rehash_policy(float __z = 1.0);
|
|
|
|
float
|
|
max_load_factor() const;
|
|
|
|
// Return a bucket size no smaller than n.
|
|
std::size_t
|
|
_M_next_bkt(std::size_t __n) const;
|
|
|
|
// Return a bucket count appropriate for n elements
|
|
std::size_t
|
|
_M_bkt_for_elements(std::size_t __n) const;
|
|
|
|
// __n_bkt is current bucket count, __n_elt is current element count,
|
|
// and __n_ins is number of elements to be inserted. Do we need to
|
|
// increase bucket count? If so, return make_pair(true, n), where n
|
|
// is the new bucket count. If not, return make_pair(false, 0).
|
|
std::pair<bool, std::size_t>
|
|
_M_need_rehash(std::size_t __n_bkt, std::size_t __n_elt,
|
|
std::size_t __n_ins) const;
|
|
|
|
float _M_max_load_factor;
|
|
float _M_growth_factor;
|
|
mutable std::size_t _M_next_resize;
|
|
};
|
|
|
|
inline
|
|
_Prime_rehash_policy::
|
|
_Prime_rehash_policy(float __z)
|
|
: _M_max_load_factor(__z), _M_growth_factor(2.f), _M_next_resize(0)
|
|
{ }
|
|
|
|
inline float
|
|
_Prime_rehash_policy::
|
|
max_load_factor() const
|
|
{ return _M_max_load_factor; }
|
|
|
|
// Return a prime no smaller than n.
|
|
inline std::size_t
|
|
_Prime_rehash_policy::
|
|
_M_next_bkt(std::size_t __n) const
|
|
{
|
|
const unsigned long* const __last = (_Primes<>::__primes
|
|
+ _Primes<>::__n_primes);
|
|
const unsigned long* __p = std::lower_bound(_Primes<>::__primes, __last,
|
|
__n);
|
|
_M_next_resize = static_cast<std::size_t>(std::ceil(*__p
|
|
* _M_max_load_factor));
|
|
return *__p;
|
|
}
|
|
|
|
// Return the smallest prime p such that alpha p >= n, where alpha
|
|
// is the load factor.
|
|
inline std::size_t
|
|
_Prime_rehash_policy::
|
|
_M_bkt_for_elements(std::size_t __n) const
|
|
{
|
|
const unsigned long* const __last = (_Primes<>::__primes
|
|
+ _Primes<>::__n_primes);
|
|
const float __min_bkts = __n / _M_max_load_factor;
|
|
const unsigned long* __p = std::lower_bound(_Primes<>::__primes, __last,
|
|
__min_bkts, _LessThan());
|
|
_M_next_resize = static_cast<std::size_t>(std::ceil(*__p
|
|
* _M_max_load_factor));
|
|
return *__p;
|
|
}
|
|
|
|
// Finds the smallest prime p such that alpha p > __n_elt + __n_ins.
|
|
// If p > __n_bkt, return make_pair(true, p); otherwise return
|
|
// make_pair(false, 0). In principle this isn't very different from
|
|
// _M_bkt_for_elements.
|
|
|
|
// The only tricky part is that we're caching the element count at
|
|
// which we need to rehash, so we don't have to do a floating-point
|
|
// multiply for every insertion.
|
|
|
|
inline std::pair<bool, std::size_t>
|
|
_Prime_rehash_policy::
|
|
_M_need_rehash(std::size_t __n_bkt, std::size_t __n_elt,
|
|
std::size_t __n_ins) const
|
|
{
|
|
if (__n_elt + __n_ins > _M_next_resize)
|
|
{
|
|
float __min_bkts = ((float(__n_ins) + float(__n_elt))
|
|
/ _M_max_load_factor);
|
|
if (__min_bkts > __n_bkt)
|
|
{
|
|
__min_bkts = std::max(__min_bkts, _M_growth_factor * __n_bkt);
|
|
const unsigned long* const __last = (_Primes<>::__primes
|
|
+ _Primes<>::__n_primes);
|
|
const unsigned long* __p = std::lower_bound(_Primes<>::__primes,
|
|
__last, __min_bkts,
|
|
_LessThan());
|
|
_M_next_resize =
|
|
static_cast<std::size_t>(std::ceil(*__p * _M_max_load_factor));
|
|
return std::make_pair(true, *__p);
|
|
}
|
|
else
|
|
{
|
|
_M_next_resize =
|
|
static_cast<std::size_t>(std::ceil(__n_bkt
|
|
* _M_max_load_factor));
|
|
return std::make_pair(false, 0);
|
|
}
|
|
}
|
|
else
|
|
return std::make_pair(false, 0);
|
|
}
|
|
|
|
// Base classes for std::tr1::_Hashtable. We define these base
|
|
// classes because in some cases we want to do different things
|
|
// depending on the value of a policy class. In some cases the
|
|
// policy class affects which member functions and nested typedefs
|
|
// are defined; we handle that by specializing base class templates.
|
|
// Several of the base class templates need to access other members
|
|
// of class template _Hashtable, so we use the "curiously recurring
|
|
// template pattern" for them.
|
|
|
|
// class template _Map_base. If the hashtable has a value type of the
|
|
// form pair<T1, T2> and a key extraction policy that returns the
|
|
// first part of the pair, the hashtable gets a mapped_type typedef.
|
|
// If it satisfies those criteria and also has unique keys, then it
|
|
// also gets an operator[].
|
|
template<typename _Key, typename _Value, typename _Ex, bool __unique,
|
|
typename _Hashtable>
|
|
struct _Map_base { };
|
|
|
|
template<typename _Key, typename _Pair, typename _Hashtable>
|
|
struct _Map_base<_Key, _Pair, std::_Select1st<_Pair>, false, _Hashtable>
|
|
{
|
|
typedef typename _Pair::second_type mapped_type;
|
|
};
|
|
|
|
template<typename _Key, typename _Pair, typename _Hashtable>
|
|
struct _Map_base<_Key, _Pair, std::_Select1st<_Pair>, true, _Hashtable>
|
|
{
|
|
typedef typename _Pair::second_type mapped_type;
|
|
|
|
mapped_type&
|
|
operator[](const _Key& __k);
|
|
};
|
|
|
|
template<typename _Key, typename _Pair, typename _Hashtable>
|
|
typename _Map_base<_Key, _Pair, std::_Select1st<_Pair>,
|
|
true, _Hashtable>::mapped_type&
|
|
_Map_base<_Key, _Pair, std::_Select1st<_Pair>, true, _Hashtable>::
|
|
operator[](const _Key& __k)
|
|
{
|
|
_Hashtable* __h = static_cast<_Hashtable*>(this);
|
|
typename _Hashtable::_Hash_code_type __code = __h->_M_hash_code(__k);
|
|
std::size_t __n = __h->_M_bucket_index(__k, __code,
|
|
__h->_M_bucket_count);
|
|
|
|
typename _Hashtable::_Node* __p =
|
|
__h->_M_find_node(__h->_M_buckets[__n], __k, __code);
|
|
if (!__p)
|
|
return __h->_M_insert_bucket(std::make_pair(__k, mapped_type()),
|
|
__n, __code)->second;
|
|
return (__p->_M_v).second;
|
|
}
|
|
|
|
// class template _Rehash_base. Give hashtable the max_load_factor
|
|
// functions iff the rehash policy is _Prime_rehash_policy.
|
|
template<typename _RehashPolicy, typename _Hashtable>
|
|
struct _Rehash_base { };
|
|
|
|
template<typename _Hashtable>
|
|
struct _Rehash_base<_Prime_rehash_policy, _Hashtable>
|
|
{
|
|
float
|
|
max_load_factor() const
|
|
{
|
|
const _Hashtable* __this = static_cast<const _Hashtable*>(this);
|
|
return __this->__rehash_policy().max_load_factor();
|
|
}
|
|
|
|
void
|
|
max_load_factor(float __z)
|
|
{
|
|
_Hashtable* __this = static_cast<_Hashtable*>(this);
|
|
__this->__rehash_policy(_Prime_rehash_policy(__z));
|
|
}
|
|
};
|
|
|
|
// Class template _Hash_code_base. Encapsulates two policy issues that
|
|
// aren't quite orthogonal.
|
|
// (1) the difference between using a ranged hash function and using
|
|
// the combination of a hash function and a range-hashing function.
|
|
// In the former case we don't have such things as hash codes, so
|
|
// we have a dummy type as placeholder.
|
|
// (2) Whether or not we cache hash codes. Caching hash codes is
|
|
// meaningless if we have a ranged hash function.
|
|
// We also put the key extraction and equality comparison function
|
|
// objects here, for convenience.
|
|
|
|
// Primary template: unused except as a hook for specializations.
|
|
template<typename _Key, typename _Value,
|
|
typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash,
|
|
bool __cache_hash_code>
|
|
struct _Hash_code_base;
|
|
|
|
// Specialization: ranged hash function, no caching hash codes. H1
|
|
// and H2 are provided but ignored. We define a dummy hash code type.
|
|
template<typename _Key, typename _Value,
|
|
typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash>
|
|
struct _Hash_code_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2,
|
|
_Hash, false>
|
|
{
|
|
protected:
|
|
_Hash_code_base(const _ExtractKey& __ex, const _Equal& __eq,
|
|
const _H1&, const _H2&, const _Hash& __h)
|
|
: _M_extract(__ex), _M_eq(__eq), _M_ranged_hash(__h) { }
|
|
|
|
typedef void* _Hash_code_type;
|
|
|
|
_Hash_code_type
|
|
_M_hash_code(const _Key& __key) const
|
|
{ return 0; }
|
|
|
|
std::size_t
|
|
_M_bucket_index(const _Key& __k, _Hash_code_type,
|
|
std::size_t __n) const
|
|
{ return _M_ranged_hash(__k, __n); }
|
|
|
|
std::size_t
|
|
_M_bucket_index(const _Hash_node<_Value, false>* __p,
|
|
std::size_t __n) const
|
|
{ return _M_ranged_hash(_M_extract(__p->_M_v), __n); }
|
|
|
|
bool
|
|
_M_compare(const _Key& __k, _Hash_code_type,
|
|
_Hash_node<_Value, false>* __n) const
|
|
{ return _M_eq(__k, _M_extract(__n->_M_v)); }
|
|
|
|
void
|
|
_M_store_code(_Hash_node<_Value, false>*, _Hash_code_type) const
|
|
{ }
|
|
|
|
void
|
|
_M_copy_code(_Hash_node<_Value, false>*,
|
|
const _Hash_node<_Value, false>*) const
|
|
{ }
|
|
|
|
void
|
|
_M_swap(_Hash_code_base& __x)
|
|
{
|
|
std::swap(_M_extract, __x._M_extract);
|
|
std::swap(_M_eq, __x._M_eq);
|
|
std::swap(_M_ranged_hash, __x._M_ranged_hash);
|
|
}
|
|
|
|
protected:
|
|
_ExtractKey _M_extract;
|
|
_Equal _M_eq;
|
|
_Hash _M_ranged_hash;
|
|
};
|
|
|
|
|
|
// No specialization for ranged hash function while caching hash codes.
|
|
// That combination is meaningless, and trying to do it is an error.
|
|
|
|
|
|
// Specialization: ranged hash function, cache hash codes. This
|
|
// combination is meaningless, so we provide only a declaration
|
|
// and no definition.
|
|
template<typename _Key, typename _Value,
|
|
typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2, typename _Hash>
|
|
struct _Hash_code_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2,
|
|
_Hash, true>;
|
|
|
|
// Specialization: hash function and range-hashing function, no
|
|
// caching of hash codes. H is provided but ignored. Provides
|
|
// typedef and accessor required by TR1.
|
|
template<typename _Key, typename _Value,
|
|
typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2>
|
|
struct _Hash_code_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2,
|
|
_Default_ranged_hash, false>
|
|
{
|
|
typedef _H1 hasher;
|
|
|
|
hasher
|
|
hash_function() const
|
|
{ return _M_h1; }
|
|
|
|
protected:
|
|
_Hash_code_base(const _ExtractKey& __ex, const _Equal& __eq,
|
|
const _H1& __h1, const _H2& __h2,
|
|
const _Default_ranged_hash&)
|
|
: _M_extract(__ex), _M_eq(__eq), _M_h1(__h1), _M_h2(__h2) { }
|
|
|
|
typedef std::size_t _Hash_code_type;
|
|
|
|
_Hash_code_type
|
|
_M_hash_code(const _Key& __k) const
|
|
{ return _M_h1(__k); }
|
|
|
|
std::size_t
|
|
_M_bucket_index(const _Key&, _Hash_code_type __c,
|
|
std::size_t __n) const
|
|
{ return _M_h2(__c, __n); }
|
|
|
|
std::size_t
|
|
_M_bucket_index(const _Hash_node<_Value, false>* __p,
|
|
std::size_t __n) const
|
|
{ return _M_h2(_M_h1(_M_extract(__p->_M_v)), __n); }
|
|
|
|
bool
|
|
_M_compare(const _Key& __k, _Hash_code_type,
|
|
_Hash_node<_Value, false>* __n) const
|
|
{ return _M_eq(__k, _M_extract(__n->_M_v)); }
|
|
|
|
void
|
|
_M_store_code(_Hash_node<_Value, false>*, _Hash_code_type) const
|
|
{ }
|
|
|
|
void
|
|
_M_copy_code(_Hash_node<_Value, false>*,
|
|
const _Hash_node<_Value, false>*) const
|
|
{ }
|
|
|
|
void
|
|
_M_swap(_Hash_code_base& __x)
|
|
{
|
|
std::swap(_M_extract, __x._M_extract);
|
|
std::swap(_M_eq, __x._M_eq);
|
|
std::swap(_M_h1, __x._M_h1);
|
|
std::swap(_M_h2, __x._M_h2);
|
|
}
|
|
|
|
protected:
|
|
_ExtractKey _M_extract;
|
|
_Equal _M_eq;
|
|
_H1 _M_h1;
|
|
_H2 _M_h2;
|
|
};
|
|
|
|
// Specialization: hash function and range-hashing function,
|
|
// caching hash codes. H is provided but ignored. Provides
|
|
// typedef and accessor required by TR1.
|
|
template<typename _Key, typename _Value,
|
|
typename _ExtractKey, typename _Equal,
|
|
typename _H1, typename _H2>
|
|
struct _Hash_code_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2,
|
|
_Default_ranged_hash, true>
|
|
{
|
|
typedef _H1 hasher;
|
|
|
|
hasher
|
|
hash_function() const
|
|
{ return _M_h1; }
|
|
|
|
protected:
|
|
_Hash_code_base(const _ExtractKey& __ex, const _Equal& __eq,
|
|
const _H1& __h1, const _H2& __h2,
|
|
const _Default_ranged_hash&)
|
|
: _M_extract(__ex), _M_eq(__eq), _M_h1(__h1), _M_h2(__h2) { }
|
|
|
|
typedef std::size_t _Hash_code_type;
|
|
|
|
_Hash_code_type
|
|
_M_hash_code(const _Key& __k) const
|
|
{ return _M_h1(__k); }
|
|
|
|
std::size_t
|
|
_M_bucket_index(const _Key&, _Hash_code_type __c,
|
|
std::size_t __n) const
|
|
{ return _M_h2(__c, __n); }
|
|
|
|
std::size_t
|
|
_M_bucket_index(const _Hash_node<_Value, true>* __p,
|
|
std::size_t __n) const
|
|
{ return _M_h2(__p->_M_hash_code, __n); }
|
|
|
|
bool
|
|
_M_compare(const _Key& __k, _Hash_code_type __c,
|
|
_Hash_node<_Value, true>* __n) const
|
|
{ return __c == __n->_M_hash_code && _M_eq(__k, _M_extract(__n->_M_v)); }
|
|
|
|
void
|
|
_M_store_code(_Hash_node<_Value, true>* __n, _Hash_code_type __c) const
|
|
{ __n->_M_hash_code = __c; }
|
|
|
|
void
|
|
_M_copy_code(_Hash_node<_Value, true>* __to,
|
|
const _Hash_node<_Value, true>* __from) const
|
|
{ __to->_M_hash_code = __from->_M_hash_code; }
|
|
|
|
void
|
|
_M_swap(_Hash_code_base& __x)
|
|
{
|
|
std::swap(_M_extract, __x._M_extract);
|
|
std::swap(_M_eq, __x._M_eq);
|
|
std::swap(_M_h1, __x._M_h1);
|
|
std::swap(_M_h2, __x._M_h2);
|
|
}
|
|
|
|
protected:
|
|
_ExtractKey _M_extract;
|
|
_Equal _M_eq;
|
|
_H1 _M_h1;
|
|
_H2 _M_h2;
|
|
};
|
|
} // namespace __detail
|
|
_GLIBCXX_END_NAMESPACE
|
|
} // namespace std::tr1
|
|
|
|
#endif // _TR1_HASHTABLE_POLICY_H
|
|
|