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 /* This software is distributed under the GNU Lesser General Public License */
 //==========================================================================
 //
 //   ne_map.h - common implementation of node_map and edge_map
 //
 //==========================================================================
 // $Id: ne_map.h,v 1.20 2005/06/14 12:22:12 raitner Exp $
 
 #ifndef GTL_NE_MAP_H
 #define GTL_NE_MAP_H
 
 #include <GTL/GTL.h>
 
 #include <vector>
 #include <cassert>
 
 //--------------------------------------------------------------------------
 //   Class declaration
 //--------------------------------------------------------------------------
 
 __GTL_BEGIN_NAMESPACE
 
 /**
  * @short Baseclass for node_map and edge_map
  *
  * ne_map is the common implementation of <code>@ref node_map </code>
  * and <code>@ref edge_map </code> and cannot be used directly.
  */
 
 template <class Key, class Value, class Graph, class Alloc = allocator<Value> > 
 class ne_map
 {
 protected:
     
     //================================================== Constructors
 
     /**
      * Constructs an empty <code>ne_map</code> not associated to any
      * <code>graph</code>.
      */
     ne_map();
 
     /**
      * Constructs a <code>ne_map</code> associated to the
      * <code>graph g</code>. The value associated to each key is set
      * to <code>def</code>.
      * You may (but need not) call
      * <code>ne_map::init(const graph &, T)</code> to associate it to
      * a <code>graph</code>.
      *
      * @param <code>g</code>   associated <code>graph</code>
      * @param <code>def</code> default value
      */
     explicit ne_map(const Graph &g, Value def=Value());
 
     //================================================== Operations
     
 public:
 
     /**
      * Initializes the ne_map to hold information for the elements
      * of graph g. def is the value associated with all elements.
      *
      * @param <code>g</code>   associated <code>graph</code>
      * @param <code>def</code> default value
      */
     void init(const Graph &, Value def=Value());
 
     /**
      * @internal
      */
 #if defined(__GTL_MSVCC) && _MSC_VER < 1310
     typedef Value& value_reference;
 #else
     typedef typename vector<Value, Alloc>::reference value_reference;
 #endif
 
     /**
      * @internal
      */
 #if defined(__GTL_MSVCC) && _MSC_VER < 1310
     typedef const Value& const_value_reference;
 #else
     typedef typename vector<Value, Alloc>::const_reference const_value_reference;
 #endif
     
     /**
      * Read/write accessor function to the value associated with
      * <code>key</code>.
      * Use this function to change the value of an element in the
      * <code>ne_map</code>. Assume that <code>ne</code> is a
      * <code>ne_map&lt;int&gt;</code>. Then you can assign the value
      * 5 to <code>key</code> with:
      * <pre>
      *   ne[key] = 5;
      * </pre>
      *
      * If there is no entry in the <code>ne_map</code> associated
      * with <code>key</code>, one is created.
      *
      * @param key Key of the Entry to change
      * @return a reference to the value associated to <code>key</code>. 
      */
     value_reference operator[](Key key);
 
     /**
      * Read-only accessor function to the value associated with
      * <code>key</code>.
      * Use this function to read the value of an element in the
      * <code>ne_map</code>. Assume that <code>ne</code> is a
      * <code>ne_map&lt;int&gt;</code>. Then you can print the value
      * associated with <code>key</code> with:
      * <pre>
      *   cout << ne[key];
      * </pre>
      *
      * @param key Key of the Entry to look up
      * @return a const reference to the value associated to
      * <code>key</code>.    
      */
     const_value_reference operator[](Key key) const;
 
     /**
      * Erases a elements of this nodemap
      */
     void clear ();
 
     //================================================== Implementation
     
 private:
     vector<Value, Alloc> data;
 };
 
 // Implementation Begin
 
 template <class Key, class Value, class Graph, class Alloc>
   ne_map<Key,Value,Graph,Alloc>::ne_map()
 {
 }
 
 template <class Key, class Value, class Graph, class Alloc>
 ne_map<Key,Value,Graph,Alloc>::ne_map(const Graph &g, Value t2) :
     data(g.number_of_ids(Key()), t2)
 {
 }
 
 template <class Key, class Value, class Graph, class Alloc>
 void ne_map<Key,Value,Graph,Alloc>::init(const Graph &g, Value t2)
 {
     int n = g.number_of_ids(Key());
     data.resize(n);
     fill_n(data.begin(), n, t2);
 }
 
 template <class Key, class Value, class Graph, class Alloc>
 typename ne_map<Key,Value,Graph,Alloc>::value_reference ne_map<Key,Value,Graph,Alloc>::operator[](Key t1)
 {
     if(t1.id() >= (signed)data.size())
     {
     if (t1.id() >= (signed)data.capacity()) {
         data.reserve((6 * t1.id()) / 5 + 1);
     }
 
     data.insert(data.end(), t1.id()+1-data.size(), Value());
     }
     return data.operator[](t1.id());
 }
 
 template <class Key, class Value, class Graph, class Alloc>
 typename ne_map<Key,Value,Graph,Alloc>::const_value_reference ne_map<Key,Value,Graph,Alloc>::operator[](Key t1) const
 {
     assert(t1.id() < (signed)data.size());
     return data.operator[](t1.id());
 }
 
 template <class Key, class Value, class Graph, class Alloc>
 void ne_map<Key,Value,Graph,Alloc>::clear ()
 {
     data.clear();
 }
 
 // Implementation End
 
 __GTL_END_NAMESPACE
 
 #endif // GTL_NE_MAP_H
 
 //--------------------------------------------------------------------------
 //   end of file
 //--------------------------------------------------------------------------

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