initial support for weighted model countign

packages/CLPBN/horus/LiftedCircuit.h

@@ -24,7 +24,9 @@ class CircuitNode
     CircuitNode (const Clauses& clauses, string explanation = "")
         : clauses_(clauses), explanation_(explanation) { }
     
-    const Clauses& clauses (void) { return clauses_; }
+    const Clauses& clauses (void) const { return clauses_; }
+    
+    Clauses clauses (void) { return clauses_; }
     
     virtual double weight (void) const { return 0; }
     
@@ -43,6 +45,8 @@ class OrNode : public CircuitNode
     OrNode (const Clauses& clauses, string explanation = "")
         : CircuitNode (clauses, explanation),
           leftBranch_(0), rightBranch_(0) { }
+          
+     double weight (void) const;
 
     CircuitNode** leftBranch  (void) { return &leftBranch_; }
     CircuitNode** rightBranch (void) { return &rightBranch_; }
@@ -74,6 +78,8 @@ class AndNode : public CircuitNode
         string explanation = "")
         : CircuitNode ({}, explanation),
           leftBranch_(leftBranch), rightBranch_(rightBranch) { }
+          
+    double weight (void) const;
 
     CircuitNode** leftBranch  (void) { return &leftBranch_; }
     CircuitNode** rightBranch (void) { return &rightBranch_; }
@@ -117,6 +123,8 @@ class LeafNode : public CircuitNode
 {
   public:
     LeafNode (const Clause& clause) : CircuitNode ({clause}) { }
+    
+    double weight (void) const;
 };
 
 
@@ -125,6 +133,8 @@ class SmoothNode : public CircuitNode
 {
   public:
     SmoothNode (const Clauses& clauses) : CircuitNode (clauses) { }
+    
+    double weight (void) const;
 };
 
 
@@ -133,6 +143,8 @@ class TrueNode : public CircuitNode
 {
   public:
     TrueNode () : CircuitNode ({}) { }
+    
+    double weight (void) const;
 };
 
 
@@ -153,8 +165,10 @@ class LiftedCircuit
     
     void smoothCircuit (void);
     
+    double getWeightedModelCount (void) const;
+    
     void exportToGraphViz (const char*);
-
+    
   private:
 
     void compile (CircuitNode** follow, const Clauses& clauses);