--- trunk/OOPSE/libmdtools/ConstraintAlgorithm.hpp	2004/06/03 21:51:55	1232
+++ trunk/OOPSE/libmdtools/ConstraintAlgorithm.hpp	2004/06/11 17:16:21	1268
@@ -14,7 +14,13 @@ class SimInfo;
 class DistanceConstraintPair;
 class SimInfo;
 
-enum ConsAlgoStatus{consFail, consSuccess, consAlready, consPairHandlerFail, consElemHandlerFail};
+enum ConsAlgoStatus{
+  consExceedMaxIter = -4, //can not constrain the bond within maximum iteration
+  consPairHandlerFail = -3, //can not found call back functor for constraint pair 
+  consElemHandlerFail = -2, //can not found callback functor for constraint element 
+  consFail = -1,  //Constraint Fail
+  consSuccess = 0,  //constrain the pair by moving two elements
+  consAlready = 1}; //current pair is already constrained, do not need to move the elements
 
 ////////////////////////////////////////////////////////////////////////////////
 //Declaration of ConstraintAlgorithm
@@ -26,14 +32,14 @@ class ConstraintAlgorithm{
 class ConstraintAlgorithm{
 
   public:
-    ~ConstraintAlgorithm();
-    virtual void doConstrain();
+  virtual ~ConstraintAlgorithm();
+  virtual void doConstrain();
 
     //using RTTI (Run Time Type Information) to dispatch 
     int doConstrainPair(ConstraintPair* consPair);
     void registerCallback(const TypeInfo& ti, CallbackFunctor* functor);
     void unRegister(TypeInfo& ti);
-    
+    bool haveError() { return error;}
   protected:
     ConstraintAlgorithm(SimInfo* rhs);
 
@@ -42,6 +48,8 @@ class ConstraintAlgorithm{
     ConstraintElementIterator* ceIter;
 
     map<TypeInfo, CallbackFunctor*> callbackMap;
+
+    bool error;
 };
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -61,4 +69,13 @@ class ConsAlgoFramework{
     
 };
 
+//Velocity Verlet constraint algorithm frame work
+class VelVerletConsFramework : public ConsAlgoFramework{
+  public:
+    virtual int doConstrainA() = 0;
+    virtual int doConstrainB() = 0;
+  protected:
+    VelVerletConsFramework(SimInfo* rhs) : ConsAlgoFramework(rhs){}
+};
+
 #endif //endif _CONSTRAINTALGORITHM_H_