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  1. // -*- C++ -*-
  2.  
  3. // Copyright (C) 2005-2015 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. }
  175.