libstdc++-v3/include/ext/pb_ds/detail/binary_heap_/insert_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2016 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
  32 // representation about the suitability of this software for any
  33 // purpose. It is provided "as is" without express or implied
  34 // warranty.
  35
  36 /**
  37  * @file binary_heap_/insert_fn_imps.hpp
  38  * Contains an implementation class for a binary_heap.
  39  */
  40
  41 PB_DS_CLASS_T_DEC
  42 inline typename PB_DS_CLASS_C_DEC::point_iterator
  43 PB_DS_CLASS_C_DEC::
  44 push(const_reference r_val)
  45 {
  46   PB_DS_ASSERT_VALID((*this))
  47   insert_value(r_val, s_no_throw_copies_ind);
  48   push_heap();
  49   PB_DS_ASSERT_VALID((*this))
  50   return point_iterator(m_a_entries);
  51 }
  52
  53 PB_DS_CLASS_T_DEC
  54 inline void
  55 PB_DS_CLASS_C_DEC::
  56 insert_value(value_type val, true_type)
  57 {
  58   resize_for_insert_if_needed();
  59   m_a_entries[m_size++] = val;
  60 }
  61
  62 PB_DS_CLASS_T_DEC
  63 inline void
  64 PB_DS_CLASS_C_DEC::
  65 insert_value(const_reference r_val, false_type)
  66 {
  67   resize_for_insert_if_needed();
  68   pointer p_new = s_value_allocator.allocate(1);
  69   cond_dealtor_t cond(p_new);
  70   new (p_new) value_type(r_val);
  71   cond.set_no_action();
  72   m_a_entries[m_size++] = p_new;
  73 }
  74
  75 PB_DS_CLASS_T_DEC
  76 inline void
  77 PB_DS_CLASS_C_DEC::
  78 resize_for_insert_if_needed()
  79 {
  80   if (!resize_policy::resize_needed_for_grow(m_size))
  81     {
  82       _GLIBCXX_DEBUG_ASSERT(m_size < m_actual_size);
  83       return;
  84     }
  85
  86   const size_type new_size = resize_policy::get_new_size_for_grow();
  87   entry_pointer new_entries = s_entry_allocator.allocate(new_size);
  88   resize_policy::notify_grow_resize();
  89
  90   std::copy(m_a_entries, m_a_entries + m_size, new_entries);
  91   s_entry_allocator.deallocate(m_a_entries, m_actual_size);
  92   m_actual_size = new_size;
  93   m_a_entries = new_entries;
  94   make_heap();
  95 }
  96
  97 PB_DS_CLASS_T_DEC
  98 void
  99 PB_DS_CLASS_C_DEC::
 100 modify(point_iterator it, const_reference r_new_val)
 101 {
 102   PB_DS_ASSERT_VALID((*this))
 103   swap_value_imp(it.m_p_e, r_new_val, s_no_throw_copies_ind);
 104   fix(it.m_p_e);
 105   PB_DS_ASSERT_VALID((*this))
 106   _GLIBCXX_DEBUG_ASSERT(is_heap());
 107 }
 108
 109 PB_DS_CLASS_T_DEC
 110 void
 111 PB_DS_CLASS_C_DEC::
 112 fix(entry_pointer p_e)
 113 {
 114   size_type i = p_e - m_a_entries;
 115   if (i > 0 && entry_cmp::operator()(m_a_entries[parent(i)], m_a_entries[i]))
 116     {
 117       size_type parent_i = parent(i);
 118       while (i > 0
 119              && entry_cmp::operator()(m_a_entries[parent_i], m_a_entries[i]))
 120         {
 121           std::swap(m_a_entries[i], m_a_entries[parent_i]);
 122           i = parent_i;
 123           parent_i = parent(i);
 124         }
 125
 126       PB_DS_ASSERT_VALID((*this))
 127       return;
 128     }
 129
 130   while (i < m_size)
 131     {
 132       const size_type lchild_i = left_child(i);
 133       const size_type rchild_i = right_child(i);
 134       _GLIBCXX_DEBUG_ASSERT(rchild_i > lchild_i);
 135
 136       const bool smaller_than_lchild = lchild_i < m_size &&
 137         entry_cmp::operator()(m_a_entries[i], m_a_entries[lchild_i]);
 138
 139       const bool smaller_than_rchild = rchild_i < m_size &&
 140         entry_cmp::operator()(m_a_entries[i], m_a_entries[rchild_i]);
 141
 142       const bool swap_with_rchild = smaller_than_rchild && (!smaller_than_lchild || entry_cmp::operator()(m_a_entries[lchild_i], m_a_entries[rchild_i]));
 143
 144       const bool swap_with_lchild = !swap_with_rchild && smaller_than_lchild;
 145
 146       if (swap_with_lchild)
 147         {
 148           std::swap(m_a_entries[i], m_a_entries[lchild_i]);
 149           i = lchild_i;
 150         }
 151       else if (swap_with_rchild)
 152         {
 153           std::swap(m_a_entries[i], m_a_entries[rchild_i]);
 154           i = rchild_i;
 155         }
 156       else
 157         i = m_size;
 158     }
 159 }
 160
 161 PB_DS_CLASS_T_DEC
 162 inline void
 163 PB_DS_CLASS_C_DEC::
 164 swap_value_imp(entry_pointer p_e, value_type new_val, true_type)
 165 { *p_e = new_val; }
 166
 167 PB_DS_CLASS_T_DEC
 168 inline void
 169 PB_DS_CLASS_C_DEC::
 170 swap_value_imp(entry_pointer p_e, const_reference r_new_val, false_type)
 171 {
 172   value_type tmp(r_new_val);
 173   (*p_e)->swap(tmp);
 174 }