libstdc++
cc_hash_table_map_/erase_no_store_hash_fn_imps.hpp
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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
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34 // warranty.
35 
36 /**
37  * @file cc_hash_table_map_/erase_no_store_hash_fn_imps.hpp
38  * Contains implementations of cc_ht_map_'s erase related functions,
39  * when the hash value is not stored.
40  */
41 
42 PB_DS_CLASS_T_DEC
43 inline bool
44 PB_DS_CLASS_C_DEC::
45 erase(key_const_reference r_key)
46 {
47  PB_DS_ASSERT_VALID((*this))
48  return erase_in_pos_imp(r_key, ranged_hash_fn_base::operator()(r_key));
49 }
50 
51 PB_DS_CLASS_T_DEC
52 inline bool
53 PB_DS_CLASS_C_DEC::
54 erase_in_pos_imp(key_const_reference r_key, size_type pos)
55 {
56  PB_DS_ASSERT_VALID((*this))
57  entry_pointer p_e = m_entries[pos];
58  resize_base::notify_erase_search_start();
59  if (p_e == 0)
60  {
61  resize_base::notify_erase_search_end();
62  PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)
63  PB_DS_ASSERT_VALID((*this))
64  return false;
65  }
66 
67  if (hash_eq_fn_base::operator()(PB_DS_V2F(p_e->m_value), r_key))
68  {
69  resize_base::notify_erase_search_end();
70  PB_DS_CHECK_KEY_EXISTS(r_key)
71  erase_entry_pointer(m_entries[pos]);
72  do_resize_if_needed_no_throw();
73  PB_DS_ASSERT_VALID((*this))
74  return true;
75  }
76 
77  while (true)
78  {
79  entry_pointer p_next_e = p_e->m_p_next;
80  if (p_next_e == 0)
81  {
82  resize_base::notify_erase_search_end();
83  PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)
84  PB_DS_ASSERT_VALID((*this))
85  return false;
86  }
87 
88  if (hash_eq_fn_base::operator()(PB_DS_V2F(p_next_e->m_value), r_key))
89  {
90  resize_base::notify_erase_search_end();
91  PB_DS_CHECK_KEY_EXISTS(r_key)
92  erase_entry_pointer(p_e->m_p_next);
93  do_resize_if_needed_no_throw();
94  PB_DS_ASSERT_VALID((*this))
95  return true;
96  }
97  resize_base::notify_erase_search_collision();
98  p_e = p_next_e;
99  }
100 }