re PR c++/27371 (Does not warn about unused function result (__attribute__((warn_unus...

[thirdparty/gcc.git] / libstdc++-v3 / include / ext / pb_ds / detail / gp_hash_table_map_ / insert_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
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// 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
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/**
 * @file insert_no_store_hash_fn_imps.hpp
 * Contains implementations of gp_ht_map_'s insert related functions, when the hash
 *    value is not stored.
 */

PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::size_type
PB_DS_CLASS_C_DEC::
find_ins_pos(const_key_reference r_key, store_hash_false_type)
{
  size_type hash = ranged_probe_fn_base::operator()(r_key);

  size_type i;

  /* The insertion position is initted to a non-legal value to indicate
   *     that it has not been initted yet.
   */
  size_type ins_pos = m_num_e;

  resize_base::notify_insert_search_start();

  for (i = 0; i < m_num_e; ++i)
    {
      const size_type pos =
	ranged_probe_fn_base::operator()(r_key, hash, i);

      PB_DS_DBG_ASSERT(pos < m_num_e);

      entry* const p_e = m_a_entries + pos;

      switch(p_e->m_stat)
        {
        case empty_entry_status:
	  {
            resize_base::notify_insert_search_end();

            PB_DS_DBG_ONLY(
			   map_debug_base::check_key_does_not_exist(r_key);)

	      return ((ins_pos == m_num_e)? pos : ins_pos);
	  }
	  break;
        case erased_entry_status:
	  if (ins_pos == m_num_e)
	    ins_pos = pos;
	  break;
        case valid_entry_status:
	  if (hash_eq_fn_base::operator()(
					  PB_DS_V2F(p_e->m_value), r_key))
            {
	      resize_base::notify_insert_search_end();

	      PB_DS_DBG_ONLY(map_debug_base::check_key_exists(r_key);)

                return (pos);
            }
	  break;
        default:
	  PB_DS_DBG_ASSERT(0);
        };

      resize_base::notify_insert_search_collision();
    }

  resize_base::notify_insert_search_end();

  if (ins_pos == m_num_e)
    throw insert_error();

  return (ins_pos);
}

PB_DS_CLASS_T_DEC
inline std::pair<typename PB_DS_CLASS_C_DEC::point_iterator, bool>
PB_DS_CLASS_C_DEC::
insert_imp(const_reference r_val, store_hash_false_type)
{
  const_key_reference r_key = PB_DS_V2F(r_val);

  const size_type pos =
    find_ins_pos(r_key, traits_base::m_store_extra_indicator);

  if (m_a_entries[pos].m_stat == valid_entry_status)
    {
      PB_DS_DBG_ONLY(map_debug_base::check_key_exists(r_key);)

        return (std::make_pair(
			       & (m_a_entries + pos)->m_value,
			       false));
    }

  PB_DS_DBG_ONLY(map_debug_base::check_key_does_not_exist(r_key));

  return (std::make_pair(
			 insert_new_imp(r_val, pos),
			 true));
}