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authorrubidium <rubidium@openttd.org>2007-01-02 19:19:48 +0000
committerrubidium <rubidium@openttd.org>2007-01-02 19:19:48 +0000
commit013df98f79866a75f367853c9e436f3c5c79f645 (patch)
treead4a63860df2626b22f77e7dac712e958bea54cb /yapf/binaryheap.hpp
parent3d32fd3f4bfaceb8a48530fbc2f4bd5db2752596 (diff)
downloadopenttd-013df98f79866a75f367853c9e436f3c5c79f645.tar.xz
(svn r7759) -Merge: makefile rewrite. This merge features:
- A proper ./configure, so everything needs to be configured only once, not for every make. - Usage of makedepend when available. This greatly reduces the time needed for generating the dependencies. - A generator for all project files. There is a single file with sources, which is used to generate Makefiles and the project files for MSVC. - Proper support for OSX universal binaries. - Object files for non-MSVC compiles are also placed in separate directories, making is faster to switch between debug and release compiles and it does not touch the directory with the source files. - Functionality to make a bundle of all needed files for for example a nightly or distribution of a binary with all needed GRFs and language files. Note: as this merge moves almost all files, it is recommended to make a backup of your working copy before updating your working copy.
Diffstat (limited to 'yapf/binaryheap.hpp')
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diff --git a/yapf/binaryheap.hpp b/yapf/binaryheap.hpp
deleted file mode 100644
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--- a/yapf/binaryheap.hpp
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@@ -1,225 +0,0 @@
-/* $Id$ */
-
-#ifndef BINARYHEAP_HPP
-#define BINARYHEAP_HPP
-
-//void* operator new (size_t size, void* p) {return p;}
-#if defined(_MSC_VER) && (_MSC_VER >= 1400)
-//void operator delete (void* p, void* p2) {}
-#endif
-
-
-/**
- * Binary Heap as C++ template.
- *
- * For information about Binary Heap algotithm,
- * see: http://www.policyalmanac.org/games/binaryHeaps.htm
- *
- * Implementation specific notes:
- *
- * 1) It allocates space for item pointers (array). Items are allocated elsewhere.
- *
- * 2) ItemPtr [0] is never used. Total array size is max_items + 1, because we
- * use indices 1..max_items instead of zero based C indexing.
- *
- * 3) Item of the binary heap should support these public members:
- * - 'lower-then' operator '<' - used for comparing items before moving
- *
- */
-
-template <class Titem_>
-class CBinaryHeapT {
-public:
- typedef Titem_ *ItemPtr;
-private:
- int m_size; ///< Number of items in the heap
- int m_max_size; ///< Maximum number of items the heap can hold
- ItemPtr* m_items; ///< The heap item pointers
-
-public:
- explicit CBinaryHeapT(int max_items = 102400)
- : m_size(0)
- , m_max_size(max_items)
- {
- m_items = new ItemPtr[max_items + 1];
- }
-
- ~CBinaryHeapT()
- {
- Clear();
- delete [] m_items;
- m_items = NULL;
- }
-
-public:
- /** Return the number of items stored in the priority queue.
- * @return number of items in the queue */
- FORCEINLINE int Size() const {return m_size;};
-
- /** Test if the priority queue is empty.
- * @return true if empty */
- FORCEINLINE bool IsEmpty() const {return (m_size == 0);};
-
- /** Test if the priority queue is full.
- * @return true if full. */
- FORCEINLINE bool IsFull() const {return (m_size >= m_max_size);};
-
- /** Find the smallest item in the priority queue.
- * Return the smallest item, or throw assert if empty. */
- FORCEINLINE Titem_& GetHead() {assert(!IsEmpty()); return *m_items[1];}
-
- /** Insert new item into the priority queue, maintaining heap order.
- * @return false if the queue is full. */
- bool Push(Titem_& new_item);
-
- /** Remove and return the smallest item from the priority queue. */
- FORCEINLINE Titem_& PopHead() {Titem_& ret = GetHead(); RemoveHead(); return ret;};
-
- /** Remove the smallest item from the priority queue. */
- void RemoveHead();
-
- /** Remove item specified by index */
- void RemoveByIdx(int idx);
-
- /** return index of the item that matches (using &item1 == &item2) the given item. */
- int FindLinear(const Titem_& item) const;
-
- /** Make the priority queue empty.
- * All remaining items will remain untouched. */
- void Clear() {m_size = 0;};
-
- /** verifies the heap consistency (added during first YAPF debug phase) */
- void CheckConsistency();
-};
-
-
-template <class Titem_>
-FORCEINLINE bool CBinaryHeapT<Titem_>::Push(Titem_& new_item)
-{
- if (IsFull()) return false;
-
- // make place for new item
- int gap = ++m_size;
- // Heapify up
- for (int parent = gap / 2; (parent > 0) && (new_item < *m_items[parent]); gap = parent, parent /= 2)
- m_items[gap] = m_items[parent];
- m_items[gap] = &new_item;
- CheckConsistency();
- return true;
-}
-
-template <class Titem_>
-FORCEINLINE void CBinaryHeapT<Titem_>::RemoveHead()
-{
- assert(!IsEmpty());
-
- // at index 1 we have a gap now
- int gap = 1;
-
- // Heapify down:
- // last item becomes a candidate for the head. Call it new_item.
- Titem_& new_item = *m_items[m_size--];
-
- // now we must maintain relation between parent and its children:
- // parent <= any child
- // from head down to the tail
- int child = 2; // first child is at [parent * 2]
-
- // while children are valid
- while (child <= m_size) {
- // choose the smaller child
- if (child < m_size && *m_items[child + 1] < *m_items[child])
- child++;
- // is it smaller than our parent?
- if (!(*m_items[child] < new_item)) {
- // the smaller child is still bigger or same as parent => we are done
- break;
- }
- // if smaller child is smaller than parent, it will become new parent
- m_items[gap] = m_items[child];
- gap = child;
- // where do we have our new children?
- child = gap * 2;
- }
- // move last item to the proper place
- if (m_size > 0) m_items[gap] = &new_item;
- CheckConsistency();
-}
-
-template <class Titem_>
-inline void CBinaryHeapT<Titem_>::RemoveByIdx(int idx)
-{
- // at position idx we have a gap now
- int gap = idx;
- Titem_& last = *m_items[m_size];
- if (idx < m_size) {
- assert(idx >= 1);
- m_size--;
- // and the candidate item for fixing this gap is our last item 'last'
- // Move gap / last item up:
- while (gap > 1)
- {
- // compare [gap] with its parent
- int parent = gap / 2;
- if (last < *m_items[parent]) {
- m_items[gap] = m_items[parent];
- gap = parent;
- } else {
- // we don't need to continue upstairs
- break;
- }
- }
-
- // Heapify (move gap) down:
- while (true) {
- // where we do have our children?
- int child = gap * 2; // first child is at [parent * 2]
- if (child > m_size) break;
- // choose the smaller child
- if (child < m_size && *m_items[child + 1] < *m_items[child])
- child++;
- // is it smaller than our parent?
- if (!(*m_items[child] < last)) {
- // the smaller child is still bigger or same as parent => we are done
- break;
- }
- // if smaller child is smaller than parent, it will become new parent
- m_items[gap] = m_items[child];
- gap = child;
- }
- // move parent to the proper place
- if (m_size > 0) m_items[gap] = &last;
- }
- else {
- assert(idx == m_size);
- m_size--;
- }
- CheckConsistency();
-}
-
-template <class Titem_>
-inline int CBinaryHeapT<Titem_>::FindLinear(const Titem_& item) const
-{
- if (IsEmpty()) return 0;
- for (ItemPtr *ppI = m_items + 1, *ppLast = ppI + m_size; ppI <= ppLast; ppI++) {
- if (*ppI == &item) {
- return ppI - m_items;
- }
- }
- return 0;
-}
-
-template <class Titem_>
-FORCEINLINE void CBinaryHeapT<Titem_>::CheckConsistency()
-{
- // enable it if you suspect binary heap doesn't work well
-#if 0
- for (int child = 2; child <= m_size; child++) {
- int parent = child / 2;
- assert(!(m_items[child] < m_items[parent]));
- }
-#endif
-}
-
-
-#endif /* BINARYHEAP_HPP */