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- /*******************************************************************************
- +
- + LEDA 3.1c
- +
- +
- + m_heap.h
- +
- +
- + Copyright (c) 1994 by Max-Planck-Institut fuer Informatik
- + Im Stadtwald, 6600 Saarbruecken, FRG
- + All rights reserved.
- +
- *******************************************************************************/
-
-
- #ifndef LEDA_M_HEAP_H
- #define LEDA_M_HEAP_H
-
- //------------------------------------------------------------------------------
- // m_heap : monotonic heaps
- //
- // a) the sequence of minimum keys (over time) is monotonic (non-decreasing)
- // b) the difference of minimum and maximum key is bounded by a constant M
- //
- // Implementation: cyclic array of lists
- //
- // Stefan Naeher (1991)
- //------------------------------------------------------------------------------
-
-
- #include <LEDA/basic.h>
- #include <LEDA/list.h>
-
-
- typedef list_item m_heap_item;
-
- class m_heap {
-
- int start;
- int offset;
- int M;
- int count;
- list<GenPtr> L;
-
- list_item* T;
-
- virtual void copy_inf(GenPtr&) const {}
- virtual void clear_inf(GenPtr&) const {}
- virtual void print_inf(GenPtr x) const { cout << x; }
-
- protected:
-
- m_heap_item item(void* p) const { return (m_heap_item)p; }
-
- public:
-
- m_heap_item insert(GenPtr,GenPtr);
- m_heap_item find_min() const;
- m_heap_item first_item() const;
- m_heap_item next_item(m_heap_item) const;
-
- GenPtr del_min();
-
- void change_key(m_heap_item,GenPtr);
- void decrease_key(m_heap_item it,GenPtr x) { change_key(it,x); }
- void change_inf(m_heap_item it, GenPtr x) { copy_inf(x); L[it] = x; };
- void del_item(m_heap_item);
- void clear();
-
- GenPtr inf(m_heap_item it) const { return L.inf(it); }
-
- GenPtr key(m_heap_item) const
- { error_handler(1,"m_heap::key not implemented");
- return 0;
- }
-
- int size() const { return count; }
- int empty() const { return count==0; }
-
- void print() const;
-
- m_heap(int M=1024);
- m_heap(int,int) { error_handler(1,"illegal constuctor"); }
-
- virtual ~m_heap() { delete T; }
-
-
- // still to do: copy operations
-
- m_heap& operator=(const m_heap&) { return *this; }
- m_heap(const m_heap&) {}
-
- };
-
- #endif
-
-