Changeset 1323:3aaadfb7de3d in lemon-0.x for src/lemon/lp_base.h

Timestamp:

04/08/05 08:46:12 (20 years ago)

Author:

Alpar Juttner

Branch:

default

Phase:

public

Convert:

svn:c9d7d8f5-90d6-0310-b91f-818b3a526b0e/lemon/trunk@1762

Message:

The case when the objective function contains a const component is handled
correctly.

File:

• src/lemon/lp_base.h (modified) (5 diffs)

src/lemon/lp_base.h

@@ -102 +102 @@
   ///Common base class for LP solvers
   class LpSolverBase {
-    
+
   public:
 
@@ -376 +376 @@
     _FixId cols;
 
+    //Abstract virtual functions
     virtual int _addCol() = 0;
     virtual int _addRow() = 0;
@@ -398 +399 @@
     virtual void _setMin() = 0;
     
-
+    //Own protected stuff
+    
+    //Constant component of the objective function
+    Value obj_const_comp;
+    
+    ///\e
+    
+    ///\bug Unimplemented
     void clearObj() {}
+    
   public:
 
+    ///\e
+    LpSolverBase() : obj_const_comp(0) {}
 
     ///\e
@@ -603 +614 @@
     
     ///\param e is a linear expression of type \ref Expr.
-    ///\todo What to do with the constant component?
+    ///\bug The previous objective function is not cleared!
     void setObj(Expr e) {
       clearObj();
       for (Expr::iterator i=e.begin(); i!=e.end(); ++i)
         objCoeff((*i).first,(*i).second);
+      obj_const_comp=e.constComp();
     }
 
@@ -647 +659 @@
     ///- \ref NAN if no primal solution is found.
     ///- The (finite) objective value if an optimal solution is found.
-    Value primalValue() { return _getPrimalValue();}
+    Value primalValue() { return _getPrimalValue()+obj_const_comp;}
     ///@}