xref: /freebsd-10-stable/contrib/libstdc++/include/ext/pb_ds/detail/cc_hash_table_map_/erase_no_store_hash_fn_imps.hpp

// -*- 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, 59 Temple Place - Suite 330, Boston,
// MA 02111-1307, 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
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/**
 * @file erase_no_store_hash_fn_imps.hpp
 * Contains implementations of cc_ht_map_'s erase related functions,
 * when the hash value is not stored.
 */

PB_DS_CLASS_T_DEC
inline bool
PB_DS_CLASS_C_DEC::
erase(const_key_reference r_key)
{
  _GLIBCXX_DEBUG_ONLY(assert_valid();)
  return erase_in_pos_imp(r_key, ranged_hash_fn_base::operator()(r_key));
}

PB_DS_CLASS_T_DEC
inline bool
PB_DS_CLASS_C_DEC::
erase_in_pos_imp(const_key_reference r_key, size_type pos)
{
  _GLIBCXX_DEBUG_ONLY(assert_valid();)
  entry_pointer p_e = m_entries[pos];
  resize_base::notify_erase_search_start();
  if (p_e == NULL)
    {
      resize_base::notify_erase_search_end();
      _GLIBCXX_DEBUG_ONLY(map_debug_base::check_key_does_not_exist(r_key);)
      _GLIBCXX_DEBUG_ONLY(assert_valid();)
      return false;
    }

  if (hash_eq_fn_base::operator()(PB_DS_V2F(p_e->m_value), r_key))
    {
      resize_base::notify_erase_search_end();
      _GLIBCXX_DEBUG_ONLY(map_debug_base:: check_key_exists(r_key);)
      erase_entry_pointer(m_entries[pos]);
      do_resize_if_needed_no_throw();
      _GLIBCXX_DEBUG_ONLY(assert_valid();)
      return true;
    }

  while (true)
    {
      entry_pointer p_next_e = p_e->m_p_next;
      if (p_next_e == NULL)
        {
	  resize_base::notify_erase_search_end();
	  _GLIBCXX_DEBUG_ONLY(map_debug_base::check_key_does_not_exist(r_key);)
          _GLIBCXX_DEBUG_ONLY(assert_valid();)
          return false;
        }

      if (hash_eq_fn_base::operator()(PB_DS_V2F(p_next_e->m_value), r_key))
        {
	  resize_base::notify_erase_search_end();
	  _GLIBCXX_DEBUG_ONLY(map_debug_base::check_key_exists(r_key);)
          erase_entry_pointer(p_e->m_p_next);
	  do_resize_if_needed_no_throw();
	  _GLIBCXX_DEBUG_ONLY(assert_valid();)
          return true;
        }
      resize_base::notify_erase_search_collision();
      p_e = p_next_e;
    }
}