# HG changeset patch
# User alpar
# Date 1105434324 0
# Node ID 6aa1520a0f2f921c124d6395f13514839d0e53d3
# Parent  7b81a36809c681c3df87d49e1f37e02eff2685ef
ShiftMap and ScaleMap added

diff -r 7b81a36809c6 -r 6aa1520a0f2f src/lemon/maps.h
--- a/src/lemon/maps.h	Tue Jan 11 09:04:08 2005 +0000
+++ b/src/lemon/maps.h	Tue Jan 11 09:05:24 2005 +0000
@@ -212,6 +212,50 @@
     return AddMap<M1,M2>(m1,m2);
   }
 
+  ///Shift a maps with a constant.
+
+  ///This \ref concept::ReadMap "read only map" returns the sum of the
+  ///given map and a constant value.
+  ///Its \c Key and \c Value is inherited from \c M.
+  ///
+  ///Actually,
+  ///\code
+  ///  ShiftMap<X> sh(x,v);
+  ///\endcode
+  ///it is equivalent with
+  ///\code
+  ///  ConstMap<X::Key, X::Value> c_tmp(v);
+  ///  AddMap<X, ConstMap<X::Key, X::Value> > sh(x,v);
+  ///\endcode
+  template<class M> 
+  class ShiftMap
+  {
+    const M &m;
+    typename M::Value v;
+  public:
+    typedef typename M::Key Key;
+    typedef typename M::Value Value;
+
+    ///Constructor
+
+    ///Constructor
+    ///\param _m is the undelying map
+    ///\param _v is the shift value
+    ShiftMap(const M &_m,const Value &_v ) : m(_m), v(_v) {};
+    Value operator[](Key k) const {return m[k]+v;}
+  };
+  
+  ///Returns an \ref ShiftMap class
+
+  ///This function just returns an \ref ShiftMap class.
+  ///\relates ShiftMap
+  ///\todo A better name is required.
+  template<class M> 
+  inline ShiftMap<M> shiftMap(const M &m,const typename M::Value &v) 
+  {
+    return ShiftMap<M>(m,v);
+  }
+
   ///Difference of two maps
 
   ///This \ref concept::ReadMap "read only map" returns the difference
@@ -282,6 +326,50 @@
     return MulMap<M1,M2>(m1,m2);
   }
  
+  ///Scale a maps with a constant.
+
+  ///This \ref concept::ReadMap "read only map" returns the value of the
+  ///given map multipied with a constant value.
+  ///Its \c Key and \c Value is inherited from \c M.
+  ///
+  ///Actually,
+  ///\code
+  ///  ScaleMap<X> sc(x,v);
+  ///\endcode
+  ///it is equivalent with
+  ///\code
+  ///  ConstMap<X::Key, X::Value> c_tmp(v);
+  ///  MulMap<X, ConstMap<X::Key, X::Value> > sc(x,v);
+  ///\endcode
+  template<class M> 
+  class ScaleMap
+  {
+    const M &m;
+    typename M::Value v;
+  public:
+    typedef typename M::Key Key;
+    typedef typename M::Value Value;
+
+    ///Constructor
+
+    ///Constructor
+    ///\param _m is the undelying map
+    ///\param _v is the scaling value
+    ScaleMap(const M &_m,const Value &_v ) : m(_m), v(_v) {};
+    Value operator[](Key k) const {return m[k]*v;}
+  };
+  
+  ///Returns an \ref ScaleMap class
+
+  ///This function just returns an \ref ScaleMap class.
+  ///\relates ScaleMap
+  ///\todo A better name is required.
+  template<class M> 
+  inline ScaleMap<M> scaleMap(const M &m,const typename M::Value &v) 
+  {
+    return ScaleMap<M>(m,v);
+  }
+
   ///Quotient of two maps
 
   ///This \ref concept::ReadMap "read only map" returns the quotient of the
diff -r 7b81a36809c6 -r 6aa1520a0f2f src/test/maps_test.cc
--- a/src/test/maps_test.cc	Tue Jan 11 09:04:08 2005 +0000
+++ b/src/test/maps_test.cc	Tue Jan 11 09:05:24 2005 +0000
@@ -26,6 +26,8 @@
   checkConcept<ReadMap<A,double>, DivMap<DoubleMap,DoubleMap> >();
   checkConcept<ReadMap<A,double>, NegMap<DoubleMap> >();
   checkConcept<ReadMap<A,double>, AbsMap<DoubleMap> >();
+  checkConcept<ReadMap<A,double>, ShiftMap<DoubleMap> >();
+  checkConcept<ReadMap<A,double>, ScaleMap<DoubleMap> >();
   
   checkConcept<ReadMap<B,double>, ComposeMap<DoubleMap,ReadMap<B,A> > >();