# HG changeset patch
# User alpar
# Date 1140612359 0
# Node ID ef2d00e4689777e4e1e55e5637bfde2de2d97074
# Parent  8ef02f0c42454ec2a115b1d22252a27b2ca0050e
vmap.h: Enables one to create maps with a virtual base class.

diff -r 8ef02f0c4245 -r ef2d00e46897 lemon/vmap.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lemon/vmap.h	Wed Feb 22 12:45:59 2006 +0000
@@ -0,0 +1,112 @@
+/* -*- C++ -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library
+ *
+ * Copyright (C) 2003-2006
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+#ifndef LEMON_LIST_GRAPH_H
+#define LEMON_LIST_GRAPH_H
+
+///\ingroup graphs
+///\file
+///\brief Virtual map support.
+
+namespace lemon {
+
+  ///Base class of the virtual maps.
+  template<class K, class V>
+  class VMapBase 
+  {
+  public:
+    ///\e
+    typedef K Key;
+    ///\e
+    typedef V Value;
+    
+    ///\e
+    virtual Value operator[](const Key &) const { return Value();}
+    ///\e
+    virtual void set(const Key &,const Value &) {}
+  };
+  
+  ///Base class of the virtual reference maps.
+  template<class K, class V>
+  class VRefMapBase 
+  {
+  public:
+    ///\e
+    typedef K Key;
+    ///\e
+    typedef V Value;
+    
+    ///\e
+    virtual Value& operator[](Key &) = 0;
+    ///\e
+    virtual Value& operator[](const Key &) const = 0;
+    ///\e
+    virtual void set(const Key &,const Value &) = 0;
+  };
+  
+  ///Makes a virtual map from a \ref concept::ReadMap "ReadMap"
+  template<class M, class K=typename M::Key,class V=typename M::Value>
+  class VReadMap : public VMapBase<K,V> 
+  {
+    const M &map;
+  public:
+  ///\e
+    VReadMap(const M &m) : map(m) {}
+    virtual Value operator[](const Key &k) const { return map[k];}
+  };
+
+  ///Function interface for \ref VReadMap.
+  template<class M, class K=typename M::Key,class V=typename M::Value>
+  vReadMap(const M& m) {return VReadMap<M,K,V>(m);}
+
+  ///Makes a virtual map from a \ref concept::WriteMap "WriteMap"
+  template<class M, class K=typename M::Key,class V=typename M::Value>
+  class VWriteMap :public VMapBase<K,V> 
+  {
+    M &map;
+  public:
+    ///\e
+    VWriteMap(M &m) : map(m) {}
+    virtual void set(const Key &k,const Value &v) { map.set(k,v);}
+  };
+
+  ///Function interface for \ref VWriteMap.
+  template<class M, class K=typename M::Key,class V=typename M::Value>
+  vWriteMap(const M& m) {return VReadMap<M,K,V>(m);}
+
+  ///Makes a virtual map from a \ref concept::ReadWriteMap "ReadWriteMap"
+  template<class M, class K=typename M::Key,class V=typename M::Value>
+  class VReadWriteMap :public VMapBase<K,V>
+  {
+    M &map;
+  public:
+    ///\e
+    VReadWriteMap(M &m) : map(m) {}
+    virtual Value operator[](const Key &k) const { return map[k];}
+    virtual void set(const Key &k,const Value &v) { map.set(k,v);}
+  };
+    
+  ///Function interface for \ref VReadWriteMap.
+  template<class M, class K=typename M::Key,class V=typename M::Value>
+  vReadWriteMap(const M& m) {return VReadMap<M,K,V>(m);}
+  
+  /// @}  
+} //namespace lemon
+  
+
+#endif