libstdc++
resize_fn_imps.hpp
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00001 // -*- C++ -*-
00002 
00003 // Copyright (C) 2005-2013 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the terms
00007 // of the GNU General Public License as published by the Free Software
00008 // Foundation; either version 3, or (at your option) any later
00009 // version.
00010 
00011 // This library is distributed in the hope that it will be useful, but
00012 // WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014 // General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
00026 
00027 // Permission to use, copy, modify, sell, and distribute this software
00028 // is hereby granted without fee, provided that the above copyright
00029 // notice appears in all copies, and that both that copyright notice
00030 // and this permission notice appear in supporting documentation. None
00031 // of the above authors, nor IBM Haifa Research Laboratories, make any
00032 // representation about the suitability of this software for any
00033 // purpose. It is provided "as is" without express or implied
00034 // warranty.
00035 
00036 /**
00037  * @file cc_hash_table_map_/resize_fn_imps.hpp
00038  * Contains implementations of cc_ht_map_'s resize related functions.
00039  */
00040 
00041 PB_DS_CLASS_T_DEC
00042 inline bool
00043 PB_DS_CLASS_C_DEC::
00044 do_resize_if_needed()
00045 {
00046   if (!resize_base::is_resize_needed())
00047     return false;
00048   resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
00049   return true;
00050 }
00051 
00052 PB_DS_CLASS_T_DEC
00053 void
00054 PB_DS_CLASS_C_DEC::
00055 do_resize(size_type len)
00056 { resize_imp(resize_base::get_nearest_larger_size(len)); }
00057 
00058 PB_DS_CLASS_T_DEC
00059 inline void
00060 PB_DS_CLASS_C_DEC::
00061 do_resize_if_needed_no_throw()
00062 {
00063   if (!resize_base::is_resize_needed())
00064     return;
00065 
00066   __try
00067     {
00068       resize_imp(resize_base::get_new_size(m_num_e, m_num_used_e));
00069     }
00070   __catch(...)
00071     { }
00072 
00073   PB_DS_ASSERT_VALID((*this))
00074 }
00075 
00076 PB_DS_CLASS_T_DEC
00077 void
00078 PB_DS_CLASS_C_DEC::
00079 resize_imp(size_type new_size)
00080 {
00081   PB_DS_ASSERT_VALID((*this))
00082   if (new_size == m_num_e)
00083     return;
00084 
00085   const size_type old_size = m_num_e;
00086   entry_pointer_array a_p_entries_resized;
00087 
00088   // Following line might throw an exception.
00089   ranged_hash_fn_base::notify_resized(new_size);
00090 
00091   __try
00092     {
00093       // Following line might throw an exception.
00094       a_p_entries_resized = s_entry_pointer_allocator.allocate(new_size);
00095       m_num_e = new_size;
00096     }
00097   __catch(...)
00098     {
00099       ranged_hash_fn_base::notify_resized(old_size);
00100       __throw_exception_again;
00101     }
00102 
00103   // At this point no exceptions can be thrown.
00104   resize_imp_no_exceptions(new_size, a_p_entries_resized, old_size);
00105   Resize_Policy::notify_resized(new_size);
00106   PB_DS_ASSERT_VALID((*this))
00107 }
00108 
00109 PB_DS_CLASS_T_DEC
00110 void
00111 PB_DS_CLASS_C_DEC::
00112 resize_imp_no_exceptions(size_type new_size, entry_pointer_array a_p_entries_resized, size_type old_size)
00113 {
00114   std::fill(a_p_entries_resized, a_p_entries_resized + m_num_e,
00115         entry_pointer(0));
00116 
00117   for (size_type pos = 0; pos < old_size; ++pos)
00118     {
00119       entry_pointer p_e = m_entries[pos];
00120       while (p_e != 0)
00121     p_e = resize_imp_no_exceptions_reassign_pointer(p_e, a_p_entries_resized,  traits_base::m_store_extra_indicator);
00122     }
00123 
00124   m_num_e = new_size;
00125   _GLIBCXX_DEBUG_ONLY(assert_entry_pointer_array_valid(a_p_entries_resized,
00126                                __FILE__, __LINE__);)
00127   s_entry_pointer_allocator.deallocate(m_entries, old_size);
00128   m_entries = a_p_entries_resized;
00129   PB_DS_ASSERT_VALID((*this))
00130 }
00131 
00132 #include <ext/pb_ds/detail/cc_hash_table_map_/resize_no_store_hash_fn_imps.hpp>
00133 #include <ext/pb_ds/detail/cc_hash_table_map_/resize_store_hash_fn_imps.hpp>
00134