lemon-main: comparison lemon/bin

equal deleted inserted replaced

-:1b95d0e13262
+:3a0046a8da26
 ///\ingroup auxdat
 ///
 ///\brief A Binary Heap implementation.
 ///
-///This class implements the \e binary \e heap data structure. A \e heap
+///This class implements the \e binary \e heap data structure.
-///is a data structure for storing items with specified values called \e
+///
-///priorities in such a way that finding the item with minimum priority is
+///A \e heap is a data structure for storing items with specified values
-///efficient. \c Compare specifies the ordering of the priorities. In a heap
+///called \e priorities in such a way that finding the item with minimum
-///one can change the priority of an item, add or erase an item, etc.
+///priority is efficient. \c Comp specifies the ordering of the priorities.
+///In a heap one can change the priority of an item, add or erase an
+///item, etc.
 ///
-///\tparam _Prio Type of the priority of the items.
+///\tparam PR Type of the priority of the items.
-///\tparam _ItemIntMap A read and writable Item int map, used internally
+///\tparam IM A read and writable item map with int values, used internally
 ///to handle the cross references.
-///\tparam _Compare A class for the ordering of the priorities. The
+///\tparam Comp A functor class for the ordering of the priorities.
-///default is \c std::less<_Prio>.
+///The default is \c std::less<PR>.
 ///
 ///\sa FibHeap
 ///\sa Dijkstra
-template <typename _Prio, typename _ItemIntMap,
+template <typename PR, typename IM, typename Comp = std::less<PR> >
-typename _Compare = std::less<_Prio> >
 class BinHeap {
 public:
 ///\e
-typedef _ItemIntMap ItemIntMap;
+typedef IM ItemIntMap;
 ///\e
-typedef _Prio Prio;
+typedef PR Prio;
 ///\e
 typedef typename ItemIntMap::Key Item;
 ///\e
 typedef std::pair<Item,Prio> Pair;
 ///\e
-typedef _Compare Compare;
+typedef Comp Compare;
 /// \brief Type to represent the items states.
 ///
 /// Each Item element have a state associated to it. It may be "in heap",
 /// "pre heap" or "post heap". The latter two are indifferent from the
 /// heap's point of view, but may be useful to the user.
 ///
-/// The ItemIntMap \e should be initialized in such way that it maps
+/// The item-int map must be initialized in such way that it assigns
-/// PRE_HEAP (-1) to any element to be put in the heap...
+/// \c PRE_HEAP (<tt>-1</tt>) to any element to be put in the heap.
 enum State {
-IN_HEAP = 0,
+IN_HEAP = 0,    ///< \e
-PRE_HEAP = -1,
+PRE_HEAP = -1,  ///< \e
-POST_HEAP = -2
+POST_HEAP = -2  ///< \e
 };
 private:
-std::vector<Pair> data;
+std::vector<Pair> _data;
-Compare comp;
+Compare _comp;
-ItemIntMap &iim;
+ItemIntMap &_iim;
 public:
 /// \brief The constructor.
 ///
 /// The constructor.
-/// \param _iim should be given to the constructor, since it is used
+/// \param map should be given to the constructor, since it is used
+/// internally to handle the cross references. The value of the map
+/// must be \c PRE_HEAP (<tt>-1</tt>) for every item.
+explicit BinHeap(ItemIntMap &map) : _iim(map) {}
+/// \brief The constructor.
+///
+/// The constructor.
+/// \param map should be given to the constructor, since it is used
 /// internally to handle the cross references. The value of the map
 /// should be PRE_HEAP (-1) for each element.
-explicit BinHeap(ItemIntMap &_iim) : iim(_iim) {}
+///
+/// \param comp The comparator function object.
-/// \brief The constructor.
+BinHeap(ItemIntMap &map, const Compare &comp)
-///
+: _iim(map), _comp(comp) {}
-/// The constructor.
-/// \param _iim should be given to the constructor, since it is used
-/// internally to handle the cross references. The value of the map
-/// should be PRE_HEAP (-1) for each element.
-///
-/// \param _comp The comparator function object.
-BinHeap(ItemIntMap &_iim, const Compare &_comp)
-: iim(_iim), comp(_comp) {}
 /// The number of items stored in the heap.
 ///
 /// \brief Returns the number of items stored in the heap.
-int size() const { return data.size(); }
+int size() const { return _data.size(); }
 /// \brief Checks if the heap stores no items.
 ///
 /// Returns \c true if and only if the heap stores no items.
-bool empty() const { return data.empty(); }
+bool empty() const { return _data.empty(); }
 /// \brief Make empty this heap.
 ///
 /// Make empty this heap. It does not change the cross reference map.
 /// If you want to reuse what is not surely empty you should first clear
 /// the heap and after that you should set the cross reference map for
 /// each item to \c PRE_HEAP.
 void clear() {
-data.clear();
+_data.clear();
 }
 private:
 static int parent(int i) { return (i-1)/2; }
 static int second_child(int i) { return 2*i+2; }
 bool less(const Pair &p1, const Pair &p2) const {
-return comp(p1.second, p2.second);
+return _comp(p1.second, p2.second);
 }
 int bubble_up(int hole, Pair p) {
 int par = parent(hole);
-while( hole>0 && less(p,data[par]) ) {
+while( hole>0 && less(p,_data[par]) ) {
-move(data[par],hole);
+move(_data[par],hole);
 hole = par;
 par = parent(hole);
 }
 move(p, hole);
 return hole;
 }
 int bubble_down(int hole, Pair p, int length) {
 int child = second_child(hole);
 while(child < length) {
-if( less(data[child-1], data[child]) ) {
+if( less(_data[child-1], _data[child]) ) {
 --child;
 }
-if( !less(data[child], p) )
+if( !less(_data[child], p) )
 goto ok;
-move(data[child], hole);
+move(_data[child], hole);
 hole = child;
 child = second_child(hole);
 }
 child--;
-if( child<length && less(data[child], p) ) {
+if( child<length && less(_data[child], p) ) {
-move(data[child], hole);
+move(_data[child], hole);
 hole=child;
 }
 ok:
 move(p, hole);
 return hole;
 }
 void move(const Pair &p, int i) {
-data[i] = p;
+_data[i] = p;
-iim.set(p.first, i);
+_iim.set(p.first, i);
 }
 public:
 /// \brief Insert a pair of item and priority into the heap.
 ///
 /// Adds \c p.first to the heap with priority \c p.second.
 /// \param p The pair to insert.
 void push(const Pair &p) {
-int n = data.size();
+int n = _data.size();
-data.resize(n+1);
+_data.resize(n+1);
 bubble_up(n, p);
 }
 /// \brief Insert an item into the heap with the given heap.
 ///
 ///
 /// This method returns the item with minimum priority relative to \c
 /// Compare.
 /// \pre The heap must be nonempty.
 Item top() const {
-return data[0].first;
+return _data[0].first;
 }
 /// \brief Returns the minimum priority relative to \c Compare.
 ///
 /// It returns the minimum priority relative to \c Compare.
 /// \pre The heap must be nonempty.
 Prio prio() const {
-return data[0].second;
+return _data[0].second;
 }
 /// \brief Deletes the item with minimum priority relative to \c Compare.
 ///
 /// This method deletes the item with minimum priority relative to \c
 /// Compare from the heap.
 /// \pre The heap must be non-empty.
 void pop() {
-int n = data.size()-1;
+int n = _data.size()-1;
-iim.set(data[0].first, POST_HEAP);
+_iim.set(_data[0].first, POST_HEAP);
 if (n > 0) {
-bubble_down(0, data[n], n);
+bubble_down(0, _data[n], n);
 }
-data.pop_back();
+_data.pop_back();
 }
 /// \brief Deletes \c i from the heap.
 ///
 /// This method deletes item \c i from the heap.
 /// \param i The item to erase.
 /// \pre The item should be in the heap.
 void erase(const Item &i) {
-int h = iim[i];
+int h = _iim[i];
-int n = data.size()-1;
+int n = _data.size()-1;
-iim.set(data[h].first, POST_HEAP);
+_iim.set(_data[h].first, POST_HEAP);
 if( h < n ) {
-if ( bubble_up(h, data[n]) == h) {
+if ( bubble_up(h, _data[n]) == h) {
-bubble_down(h, data[n], n);
+bubble_down(h, _data[n], n);
 }
 }
-data.pop_back();
+_data.pop_back();
 }
 /// \brief Returns the priority of \c i.
 ///
 /// This function returns the priority of item \c i.
+/// \param i The item.
 /// \pre \c i must be in the heap.
-/// \param i The item.
 Prio operator[](const Item &i) const {
-int idx = iim[i];
+int idx = _iim[i];
-return data[idx].second;
+return _data[idx].second;
 }
 /// \brief \c i gets to the heap with priority \c p independently
 /// if \c i was already there.
 ///
 /// This method calls \ref push(\c i, \c p) if \c i is not stored
 /// in the heap and sets the priority of \c i to \c p otherwise.
 /// \param i The item.
 /// \param p The priority.
 void set(const Item &i, const Prio &p) {
-int idx = iim[i];
+int idx = _iim[i];
 if( idx < 0 ) {
 push(i,p);
 }
-else if( comp(p, data[idx].second) ) {
+else if( _comp(p, _data[idx].second) ) {
 bubble_up(idx, Pair(i,p));
 }
 else {
-bubble_down(idx, Pair(i,p), data.size());
+bubble_down(idx, Pair(i,p), _data.size());
 }
 }
 /// \brief Decreases the priority of \c i to \c p.
 ///
 /// This method decreases the priority of item \c i to \c p.
+/// \param i The item.
+/// \param p The priority.
 /// \pre \c i must be stored in the heap with priority at least \c
 /// p relative to \c Compare.
+void decrease(const Item &i, const Prio &p) {
+int idx = _iim[i];
+bubble_up(idx, Pair(i,p));
+}
+/// \brief Increases the priority of \c i to \c p.
+///
+/// This method sets the priority of item \c i to \c p.
 /// \param i The item.
 /// \param p The priority.
-void decrease(const Item &i, const Prio &p) {
-int idx = iim[i];
-bubble_up(idx, Pair(i,p));
-}
-/// \brief Increases the priority of \c i to \c p.
-///
-/// This method sets the priority of item \c i to \c p.
 /// \pre \c i must be stored in the heap with priority at most \c
 /// p relative to \c Compare.
-/// \param i The item.
-/// \param p The priority.
 void increase(const Item &i, const Prio &p) {
-int idx = iim[i];
+int idx = _iim[i];
-bubble_down(idx, Pair(i,p), data.size());
+bubble_down(idx, Pair(i,p), _data.size());
 }
 /// \brief Returns if \c item is in, has already been in, or has
 /// never been in the heap.
 ///
 /// heap, IN_HEAP if it is in the heap at the moment, and POST_HEAP
 /// otherwise. In the latter case it is possible that \c item will
 /// get back to the heap again.
 /// \param i The item.
 State state(const Item &i) const {
-int s = iim[i];
+int s = _iim[i];
 if( s>=0 )
 s=0;
 return State(s);
 }
 case POST_HEAP:
 case PRE_HEAP:
 if (state(i) == IN_HEAP) {
 erase(i);
 }
-iim[i] = st;
+_iim[i] = st;
 break;
 case IN_HEAP:
 break;
 }
 }
 /// The \c i item is replaced with \c j item. The \c i item should
 /// be in the heap, while the \c j should be out of the heap. The
 /// \c i item will out of the heap and \c j will be in the heap
 /// with the same prioriority as prevoiusly the \c i item.
 void replace(const Item& i, const Item& j) {
-int idx = iim[i];
+int idx = _iim[i];
-iim.set(i, iim[j]);
+_iim.set(i, _iim[j]);
-iim.set(j, idx);
+_iim.set(j, idx);
-data[idx].first = j;
+_data[idx].first = j;
 }
 }; // class BinHeap
 } // namespace lemon

changeset 566	e7017ec2d5cd
parent 440	88ed40ad0d4f
child 584	33c6b6e755cd