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(svn r19236) -Codechange: move method code into class definition (skidd13)
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@ -69,160 +69,153 @@ public:
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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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FORCEINLINE Titem_& GetHead()
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{
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assert(!IsEmpty());
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return *m_items[1];
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}
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/** Insert new item into the priority queue, maintaining heap order. */
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void Push(Titem_& new_item);
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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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FORCEINLINE void Push(Titem_& new_item)
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{
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if (IsFull()) {
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m_max_size *= 2;
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m_items = ReallocT<ItemPtr>(m_items, m_max_size + 1);
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}
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/* make place for new item */
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int gap = ++m_size;
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/* Heapify up */
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for (int parent = gap / 2; (parent > 0) && (new_item < *m_items[parent]); gap = parent, parent /= 2)
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m_items[gap] = m_items[parent];
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m_items[gap] = &new_item;
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CheckConsistency();
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}
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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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FORCEINLINE Titem_& PopHead()
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{
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Titem_& ret = GetHead();
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RemoveHead();
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return ret;
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}
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/** Remove the smallest item from the priority queue. */
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void RemoveHead();
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FORCEINLINE void RemoveHead()
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{
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assert(!IsEmpty());
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/** Remove item specified by index */
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void RemoveByIdx(int idx);
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/* at index 1 we have a gap now */
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int gap = 1;
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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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/* Heapify down:
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* last item becomes a candidate for the head. Call it new_item. */
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Titem_& new_item = *m_items[m_size--];
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/** Make the priority queue empty.
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* All remaining items will remain untouched. */
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void Clear() {m_size = 0;};
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/* now we must maintain relation between parent and its children:
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* parent <= any child
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* from head down to the tail */
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int child = 2; // first child is at [parent * 2]
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/** verifies the heap consistency (added during first YAPF debug phase) */
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void CheckConsistency();
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};
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template <class Titem_>
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FORCEINLINE void CBinaryHeapT<Titem_>::Push(Titem_& new_item)
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{
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if (IsFull()) {
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m_max_size *= 2;
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m_items = ReallocT<ItemPtr>(m_items, m_max_size + 1);
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}
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/* make place for new item */
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int gap = ++m_size;
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/* Heapify up */
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for (int parent = gap / 2; (parent > 0) && (new_item < *m_items[parent]); gap = parent, parent /= 2)
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m_items[gap] = m_items[parent];
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m_items[gap] = &new_item;
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CheckConsistency();
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}
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template <class Titem_>
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FORCEINLINE void CBinaryHeapT<Titem_>::RemoveHead()
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{
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assert(!IsEmpty());
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/* at index 1 we have a gap now */
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int gap = 1;
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/* Heapify down:
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* last item becomes a candidate for the head. Call it new_item. */
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Titem_& new_item = *m_items[m_size--];
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/* now we must maintain relation between parent and its children:
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* parent <= any child
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* from head down to the tail */
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int child = 2; // first child is at [parent * 2]
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/* while children are valid */
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while (child <= m_size) {
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/* choose the smaller child */
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if (child < m_size && *m_items[child + 1] < *m_items[child])
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child++;
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/* is it smaller than our parent? */
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if (!(*m_items[child] < new_item)) {
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/* the smaller child is still bigger or same as parent => we are done */
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break;
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}
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/* if smaller child is smaller than parent, it will become new parent */
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m_items[gap] = m_items[child];
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gap = child;
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/* where do we have our new children? */
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child = gap * 2;
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}
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/* move last item to the proper place */
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if (m_size > 0) m_items[gap] = &new_item;
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CheckConsistency();
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}
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template <class Titem_>
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inline void CBinaryHeapT<Titem_>::RemoveByIdx(int idx)
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{
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/* at position idx we have a gap now */
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int gap = idx;
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Titem_& last = *m_items[m_size];
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if (idx < m_size) {
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assert(idx >= 1);
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m_size--;
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/* and the candidate item for fixing this gap is our last item 'last'
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* Move gap / last item up: */
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while (gap > 1)
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{
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/* compare [gap] with its parent */
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int parent = gap / 2;
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if (last < *m_items[parent]) {
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m_items[gap] = m_items[parent];
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gap = parent;
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} else {
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/* we don't need to continue upstairs */
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break;
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}
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}
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/* 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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if (child > m_size) break;
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/* while children are valid */
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while (child <= m_size) {
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/* choose the smaller child */
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if (child < m_size && *m_items[child + 1] < *m_items[child])
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child++;
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/* is it smaller than our parent? */
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if (!(*m_items[child] < last)) {
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if (!(*m_items[child] < new_item)) {
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/* the smaller child is still bigger or same as parent => we are done */
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break;
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}
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/* if smaller child is smaller than parent, it will become new parent */
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m_items[gap] = m_items[child];
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gap = child;
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/* where do we have our new children? */
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child = gap * 2;
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}
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/* move parent to the proper place */
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if (m_size > 0) m_items[gap] = &last;
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} else {
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assert(idx == m_size);
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m_size--;
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/* move last item to the proper place */
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if (m_size > 0) m_items[gap] = &new_item;
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CheckConsistency();
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}
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CheckConsistency();
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}
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template <class Titem_>
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inline int CBinaryHeapT<Titem_>::FindLinear(const Titem_& item) const
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{
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if (IsEmpty()) return 0;
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for (ItemPtr *ppI = m_items + 1, *ppLast = ppI + m_size; ppI <= ppLast; ppI++) {
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if (*ppI == &item) {
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return ppI - m_items;
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/** Remove item specified by index */
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FORCEINLINE void RemoveByIdx(int idx)
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{
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/* at position idx we have a gap now */
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int gap = idx;
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Titem_& last = *m_items[m_size];
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if (idx < m_size) {
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assert(idx >= 1);
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m_size--;
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/* and the candidate item for fixing this gap is our last item 'last'
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* Move gap / last item up: */
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while (gap > 1)
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{
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/* compare [gap] with its parent */
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int parent = gap / 2;
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if (last < *m_items[parent]) {
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m_items[gap] = m_items[parent];
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gap = parent;
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} else {
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/* we don't need to continue upstairs */
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break;
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}
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}
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/* 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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if (child > m_size) break;
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/* choose the smaller child */
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if (child < m_size && *m_items[child + 1] < *m_items[child])
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child++;
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/* is it smaller than our parent? */
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if (!(*m_items[child] < last)) {
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/* the smaller child is still bigger or same as parent => we are done */
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break;
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}
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/* if smaller child is smaller than parent, it will become new parent */
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m_items[gap] = m_items[child];
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gap = child;
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}
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/* move parent to the proper place */
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if (m_size > 0) m_items[gap] = &last;
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} else {
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assert(idx == m_size);
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m_size--;
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}
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CheckConsistency();
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}
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return 0;
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}
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template <class Titem_>
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FORCEINLINE void CBinaryHeapT<Titem_>::CheckConsistency()
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{
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/* enable it if you suspect binary heap doesn't work well */
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/** return index of the item that matches (using &item1 == &item2) the given item. */
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FORCEINLINE int FindLinear(const Titem_& item) const
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{
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if (IsEmpty()) return 0;
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for (ItemPtr *ppI = m_items + 1, *ppLast = ppI + m_size; ppI <= ppLast; ppI++) {
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if (*ppI == &item) {
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return ppI - m_items;
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}
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}
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return 0;
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}
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/** Make the priority queue empty.
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* All remaining items will remain untouched. */
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FORCEINLINE void Clear() {m_size = 0;}
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/** verifies the heap consistency (added during first YAPF debug phase) */
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FORCEINLINE void CheckConsistency()
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{
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/* enable it if you suspect binary heap doesn't work well */
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#if 0
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for (int child = 2; child <= m_size; child++) {
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int parent = child / 2;
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assert(!(*m_items[child] < *m_items[parent]));
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}
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for (int child = 2; child <= m_size; child++) {
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int parent = child / 2;
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assert(!(*m_items[child] < *m_items[parent]));
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}
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#endif
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}
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}
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};
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#endif /* BINARYHEAP_HPP */
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