libstdc++-v3/include/ext/pb_ds/detail/gp_hash_table_map_/insert_no_store_hash_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2019 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the terms
   7 // of the GNU General Public License as published by the Free Software
   8 // Foundation; either version 3, or (at your option) any later
   9 // version.
  10
  11 // This library is distributed in the hope that it will be useful, but
  12 // WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 // General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  26
  27 // Permission to use, copy, modify, sell, and distribute this software
  28 // is hereby granted without fee, provided that the above copyright
  29 // notice appears in all copies, and that both that copyright notice
  30 // and this permission notice appear in supporting documentation. None
  31 // of the above authors, nor IBM Haifa Research Laboratories, make any
  32 // representation about the suitability of this software for any
  33 // purpose. It is provided "as is" without express or implied
  34 // warranty.
  35
  36 /**
  37  * @file gp_hash_table_map_/insert_no_store_hash_fn_imps.hpp
  38  * Contains implementations of gp_ht_map_'s insert related functions,
  39  * when the hash value is not stored.
  40  */
  41
  42 PB_DS_CLASS_T_DEC
  43 inline typename PB_DS_CLASS_C_DEC::size_type
  44 PB_DS_CLASS_C_DEC::
  45 find_ins_pos(key_const_reference r_key, false_type)
  46 {
  47   size_type hash = ranged_probe_fn_base::operator()(r_key);
  48   size_type i;
  49
  50   /* The insertion position is initted to a non-legal value to indicate
  51    *     that it has not been initted yet.
  52    */
  53   size_type ins_pos = m_num_e;
  54   resize_base::notify_insert_search_start();
  55   for (i = 0; i < m_num_e; ++i)
  56     {
  57       const size_type pos = ranged_probe_fn_base::operator()(r_key, hash, i);
  58       _GLIBCXX_DEBUG_ASSERT(pos < m_num_e);
  59       entry* const p_e = m_entries + pos;
  60       switch(p_e->m_stat)
  61         {
  62         case empty_entry_status:
  63           {
  64             resize_base::notify_insert_search_end();
  65             PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)
  66             return (ins_pos == m_num_e) ? pos : ins_pos;
  67           }
  68           break;
  69         case erased_entry_status:
  70           if (ins_pos == m_num_e)
  71             ins_pos = pos;
  72           break;
  73         case valid_entry_status:
  74           if (hash_eq_fn_base::operator()(PB_DS_V2F(p_e->m_value), r_key))
  75             {
  76               resize_base::notify_insert_search_end();
  77               PB_DS_CHECK_KEY_EXISTS(r_key)
  78                 return pos;
  79             }
  80           break;
  81         default:
  82           _GLIBCXX_DEBUG_ASSERT(0);
  83         };
  84
  85       resize_base::notify_insert_search_collision();
  86     }
  87   resize_base::notify_insert_search_end();
  88   if (ins_pos == m_num_e)
  89     __throw_insert_error();
  90   return ins_pos;
  91 }
  92
  93 PB_DS_CLASS_T_DEC
  94 inline std::pair<typename PB_DS_CLASS_C_DEC::point_iterator, bool>
  95 PB_DS_CLASS_C_DEC::
  96 insert_imp(const_reference r_val, false_type)
  97 {
  98   key_const_reference r_key = PB_DS_V2F(r_val);
  99   const size_type pos = find_ins_pos(r_key,
 100                                      traits_base::m_store_extra_indicator);
 101
 102   if (m_entries[pos].m_stat == valid_entry_status)
 103     {
 104       PB_DS_CHECK_KEY_EXISTS(r_key)
 105       return std::make_pair(&(m_entries + pos)->m_value, false);
 106     }
 107
 108   PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)
 109   return std::make_pair(insert_new_imp(r_val, pos), true);
 110 }
 111