gp_hash_table_map_/insert_store_hash_fn_imps.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2014 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 3, 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
// 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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// warranty.
/**
* @file gp_hash_table_map_/insert_store_hash_fn_imps.hpp
* Contains implementations of gp_ht_map_'s find related functions,
* when the hash value is stored.
*/
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::comp_hash
PB_DS_CLASS_C_DEC::
find_ins_pos(key_const_reference r_key, true_type)
{
PB_DS_ASSERT_VALID((*this))
comp_hash pos_hash_pair = 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, pos_hash_pair.second, i);
entry* const p_e = m_entries + pos;
switch(p_e->m_stat)
{
case empty_entry_status:
{
resize_base::notify_insert_search_end();
PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)
return ((ins_pos == m_num_e) ?
std::make_pair(pos, pos_hash_pair.second) :
std::make_pair(ins_pos, pos_hash_pair.second));
}
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), p_e->m_hash,
r_key, pos_hash_pair.second))
{
resize_base::notify_insert_search_end();
PB_DS_CHECK_KEY_EXISTS(r_key)
return std::make_pair(pos, pos_hash_pair.second);
}
break;
default:
_GLIBCXX_DEBUG_ASSERT(0);
};
resize_base::notify_insert_search_collision();
}
resize_base::notify_insert_search_end();
if (ins_pos == m_num_e)
__throw_insert_error();
return std::make_pair(ins_pos, pos_hash_pair.second);
}
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, true_type)
{
key_const_reference r_key = PB_DS_V2F(r_val);
comp_hash pos_hash_pair = find_ins_pos(r_key,
traits_base::m_store_extra_indicator);
_GLIBCXX_DEBUG_ASSERT(pos_hash_pair.first < m_num_e);
entry_pointer p_e =& m_entries[pos_hash_pair.first];
if (p_e->m_stat == valid_entry_status)
{
PB_DS_CHECK_KEY_EXISTS(r_key)
return std::make_pair(&p_e->m_value, false);
}
PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key)
return std::make_pair(insert_new_imp(r_val, pos_hash_pair), true);
}
std::make_pair
constexpr pair< typename __decay_and_strip< _T1 >::__type, typename __decay_and_strip< _T2 >::__type > make_pair(_T1 &&__x, _T2 &&__y)
A convenience wrapper for creating a pair from two objects.
Definition: stl_pair.h:276
std::true_type
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition: type_traits:72