Changeset 1902:e9af75c90c28 in lemon-0.x for lemon/fib_heap.h

Timestamp:

01/25/06 13:10:18 (18 years ago)

Author:

Balazs Dezso

Branch:

default

Phase:

public

Convert:

svn:c9d7d8f5-90d6-0310-b91f-818b3a526b0e/lemon/trunk@2477

Message:

state setting function for heaps

If we know that which elements were in the heap then
we can clear it in better time complexity.

File:

• lemon/fib_heap.h (modified) (1 diff)

lemon/fib_heap.h

@@ -217 +217 @@
       return state_enum(i);
     }    
+
+    /// \brief Sets the state of the \c item in the heap.
+    ///
+    /// Sets the state of the \c item in the heap. It can be used to
+    /// manually clear the heap when it is important to achive the
+    /// better time complexity.
+    /// \param i The item.
+    /// \param st The state. It should not be \c IN_HEAP. 
+    void state(const Item& i, state_enum st) {
+      switch (st) {
+      case POST_HEAP:
+      case PRE_HEAP:
+        if (state(i) == IN_HEAP) {
+          erase(i);
+        }
+        index[i] = st;
+        break;
+      }
+    }
     
   private: