author | KUDr |
Sat, 13 Jan 2007 13:33:36 +0000 | |
changeset 5633 | e1905dacc378 |
child 6481 | 85ad87daf4b0 |
permissions | -rw-r--r-- |
5633
e1905dacc378
(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
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/* $Id$ */ |
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#ifndef BINARYHEAP_HPP |
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#define BINARYHEAP_HPP |
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//void* operator new (size_t size, void* p) {return p;} |
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#if defined(_MSC_VER) && (_MSC_VER >= 1400) |
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//void operator delete (void* p, void* p2) {} |
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#endif |
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/** |
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* Binary Heap as C++ template. |
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* |
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* For information about Binary Heap algotithm, |
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* see: http://www.policyalmanac.org/games/binaryHeaps.htm |
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* |
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* Implementation specific notes: |
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* |
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* 1) It allocates space for item pointers (array). Items are allocated elsewhere. |
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* |
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* 2) ItemPtr [0] is never used. Total array size is max_items + 1, because we |
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* use indices 1..max_items instead of zero based C indexing. |
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* |
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* 3) Item of the binary heap should support these public members: |
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* - 'lower-then' operator '<' - used for comparing items before moving |
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* |
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*/ |
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template <class Titem_> |
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class CBinaryHeapT { |
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public: |
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typedef Titem_ *ItemPtr; |
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private: |
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int m_size; ///< Number of items in the heap |
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int m_max_size; ///< Maximum number of items the heap can hold |
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ItemPtr* m_items; ///< The heap item pointers |
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public: |
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explicit CBinaryHeapT(int max_items = 102400) |
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: m_size(0) |
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, m_max_size(max_items) |
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{ |
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m_items = new ItemPtr[max_items + 1]; |
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} |
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~CBinaryHeapT() |
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{ |
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Clear(); |
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delete [] m_items; |
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m_items = NULL; |
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} |
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public: |
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/** Return the number of items stored in the priority queue. |
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* @return number of items in the queue */ |
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FORCEINLINE int Size() const {return m_size;}; |
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/** Test if the priority queue is empty. |
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* @return true if empty */ |
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FORCEINLINE bool IsEmpty() const {return (m_size == 0);}; |
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/** Test if the priority queue is full. |
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* @return true if full. */ |
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FORCEINLINE bool IsFull() const {return (m_size >= m_max_size);}; |
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/** Find the smallest item in the priority queue. |
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* Return the smallest item, or throw assert if empty. */ |
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FORCEINLINE Titem_& GetHead() {assert(!IsEmpty()); return *m_items[1];} |
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/** Insert new item into the priority queue, maintaining heap order. |
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* @return false if the queue is full. */ |
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bool Push(Titem_& new_item); |
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/** Remove and return the smallest item from the priority queue. */ |
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FORCEINLINE Titem_& PopHead() {Titem_& ret = GetHead(); RemoveHead(); return ret;}; |
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/** Remove the smallest item from the priority queue. */ |
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void RemoveHead(); |
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/** Remove item specified by index */ |
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void RemoveByIdx(int idx); |
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/** return index of the item that matches (using &item1 == &item2) the given item. */ |
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int FindLinear(const Titem_& item) const; |
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87 |
/** Make the priority queue empty. |
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88 |
* All remaining items will remain untouched. */ |
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89 |
void Clear() {m_size = 0;}; |
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90 |
|
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91 |
/** verifies the heap consistency (added during first YAPF debug phase) */ |
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92 |
void CheckConsistency(); |
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93 |
}; |
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94 |
|
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95 |
|
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96 |
template <class Titem_> |
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97 |
FORCEINLINE bool CBinaryHeapT<Titem_>::Push(Titem_& new_item) |
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98 |
{ |
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99 |
if (IsFull()) return false; |
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100 |
|
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101 |
// make place for new item |
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102 |
int gap = ++m_size; |
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103 |
// Heapify up |
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104 |
for (int parent = gap / 2; (parent > 0) && (new_item < *m_items[parent]); gap = parent, parent /= 2) |
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105 |
m_items[gap] = m_items[parent]; |
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106 |
m_items[gap] = &new_item; |
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107 |
CheckConsistency(); |
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108 |
return true; |
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109 |
} |
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110 |
|
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111 |
template <class Titem_> |
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112 |
FORCEINLINE void CBinaryHeapT<Titem_>::RemoveHead() |
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113 |
{ |
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114 |
assert(!IsEmpty()); |
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115 |
|
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116 |
// at index 1 we have a gap now |
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117 |
int gap = 1; |
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118 |
|
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119 |
// Heapify down: |
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120 |
// last item becomes a candidate for the head. Call it new_item. |
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121 |
Titem_& new_item = *m_items[m_size--]; |
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122 |
|
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123 |
// now we must maintain relation between parent and its children: |
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124 |
// parent <= any child |
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125 |
// from head down to the tail |
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126 |
int child = 2; // first child is at [parent * 2] |
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127 |
|
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128 |
// while children are valid |
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129 |
while (child <= m_size) { |
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130 |
// choose the smaller child |
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131 |
if (child < m_size && *m_items[child + 1] < *m_items[child]) |
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132 |
child++; |
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133 |
// is it smaller than our parent? |
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134 |
if (!(*m_items[child] < new_item)) { |
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135 |
// the smaller child is still bigger or same as parent => we are done |
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136 |
break; |
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137 |
} |
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138 |
// if smaller child is smaller than parent, it will become new parent |
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139 |
m_items[gap] = m_items[child]; |
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140 |
gap = child; |
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141 |
// where do we have our new children? |
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142 |
child = gap * 2; |
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143 |
} |
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144 |
// move last item to the proper place |
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145 |
if (m_size > 0) m_items[gap] = &new_item; |
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146 |
CheckConsistency(); |
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147 |
} |
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148 |
|
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149 |
template <class Titem_> |
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150 |
inline void CBinaryHeapT<Titem_>::RemoveByIdx(int idx) |
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151 |
{ |
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152 |
// at position idx we have a gap now |
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153 |
int gap = idx; |
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154 |
Titem_& last = *m_items[m_size]; |
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155 |
if (idx < m_size) { |
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156 |
assert(idx >= 1); |
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157 |
m_size--; |
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158 |
// and the candidate item for fixing this gap is our last item 'last' |
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159 |
// Move gap / last item up: |
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160 |
while (gap > 1) |
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161 |
{ |
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162 |
// compare [gap] with its parent |
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163 |
int parent = gap / 2; |
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164 |
if (last < *m_items[parent]) { |
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165 |
m_items[gap] = m_items[parent]; |
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166 |
gap = parent; |
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167 |
} else { |
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168 |
// we don't need to continue upstairs |
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169 |
break; |
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170 |
} |
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171 |
} |
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172 |
|
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173 |
// Heapify (move gap) down: |
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while (true) { |
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// where we do have our children? |
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int child = gap * 2; // first child is at [parent * 2] |
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177 |
if (child > m_size) break; |
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178 |
// choose the smaller child |
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179 |
if (child < m_size && *m_items[child + 1] < *m_items[child]) |
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180 |
child++; |
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181 |
// is it smaller than our parent? |
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182 |
if (!(*m_items[child] < last)) { |
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183 |
// the smaller child is still bigger or same as parent => we are done |
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184 |
break; |
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185 |
} |
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186 |
// if smaller child is smaller than parent, it will become new parent |
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187 |
m_items[gap] = m_items[child]; |
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188 |
gap = child; |
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189 |
} |
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190 |
// move parent to the proper place |
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191 |
if (m_size > 0) m_items[gap] = &last; |
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192 |
} |
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193 |
else { |
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194 |
assert(idx == m_size); |
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195 |
m_size--; |
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196 |
} |
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197 |
CheckConsistency(); |
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198 |
} |
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199 |
|
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200 |
template <class Titem_> |
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201 |
inline int CBinaryHeapT<Titem_>::FindLinear(const Titem_& item) const |
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202 |
{ |
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203 |
if (IsEmpty()) return 0; |
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204 |
for (ItemPtr *ppI = m_items + 1, *ppLast = ppI + m_size; ppI <= ppLast; ppI++) { |
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205 |
if (*ppI == &item) { |
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206 |
return ppI - m_items; |
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207 |
} |
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208 |
} |
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209 |
return 0; |
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210 |
} |
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211 |
|
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212 |
template <class Titem_> |
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213 |
FORCEINLINE void CBinaryHeapT<Titem_>::CheckConsistency() |
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214 |
{ |
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215 |
// enable it if you suspect binary heap doesn't work well |
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216 |
#if 0 |
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217 |
for (int child = 2; child <= m_size; child++) { |
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218 |
int parent = child / 2; |
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219 |
assert(!(m_items[child] < m_items[parent])); |
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220 |
} |
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221 |
#endif |
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222 |
} |
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223 |
|
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224 |
|
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225 |
#endif /* BINARYHEAP_HPP */ |