1.1 --- a/src/lemon/maps.h	Thu Feb 24 17:48:25 2005 +0000
     1.2 +++ b/src/lemon/maps.h	Fri Feb 25 14:50:22 2005 +0000
     1.3 @@ -186,6 +186,49 @@
     1.4      };
     1.5    };
     1.6  
     1.7 +  ///Convert the \c Value of a maps to another type.
     1.8 +
     1.9 +  ///This \ref concept::ReadMap "read only map"
    1.10 +  ///converts the \c Value of a maps to type \c T.
    1.11 +  ///Its \c Value is inherited from \c M.
    1.12 +  ///
    1.13 +  ///Actually,
    1.14 +  ///\code
    1.15 +  ///  ConvertMap<X> sh(x,v);
    1.16 +  ///\endcode
    1.17 +  ///it is equivalent with
    1.18 +  ///\code
    1.19 +  ///  ConstMap<X::Key, X::Value> c_tmp(v);
    1.20 +  ///  AddMap<X, ConstMap<X::Key, X::Value> > sh(x,v);
    1.21 +  ///\endcode
    1.22 +  ///\bug wrong documentation
    1.23 +  template<class M, class T> 
    1.24 +  class ConvertMap
    1.25 +  {
    1.26 +    const M &m;
    1.27 +  public:
    1.28 +    typedef typename M::Key Key;
    1.29 +    typedef T Value;
    1.30 +
    1.31 +    ///Constructor
    1.32 +
    1.33 +    ///Constructor
    1.34 +    ///\param _m is the undelying map
    1.35 +    ///\param _v is the convert value
    1.36 +    ConvertMap(const M &_m) : m(_m) {};
    1.37 +    Value operator[](Key k) const {return m[k];}
    1.38 +  };
    1.39 +  
    1.40 +  ///Returns an \ref ConvertMap class
    1.41 +
    1.42 +  ///This function just returns an \ref ConvertMap class.
    1.43 +  ///\relates ConvertMap
    1.44 +  ///\todo The order of the template parameters are changed.
    1.45 +  template<class T, class M>
    1.46 +  inline ConvertMap<M,T> convertMap(const M &m) 
    1.47 +  {
    1.48 +    return ConvertMap<M,T>(m);
    1.49 +  }
    1.50  
    1.51    ///Sum of two maps
    1.52