2 files changed, 24 insertions, 40 deletions

diff --git a/impl/Operator.hpp b/impl/Operator.hpp
index 0b08866..d16152e 100644
--- a/impl/Operator.hpp
+++ b/impl/Operator.hpp
@@ -171,14 +171,20 @@ struct MinCostFlow : public Operator<Domain> {
       _solver.ChgCost(i, costs[i].template as<MCFClass::CNumber>());
     }
     _solver.SolveMCF();
-    if (_solver.MCFGetStatus() == MCFClass::kUnfeasible){
+
+    if (_solver.MCFGetStatus() != MCFClass::kOK) {
       return -infinity<Domain>();
-    } else if (_solver.MCFGetFO() == MCFClass::Inf<MCFClass::FONumber>()) {
-      return infinity<Domain>();
-    } else if (_solver.MCFGetFO() == -MCFClass::Inf<MCFClass::FONumber>()) {
-      return -infinity<Domain>();        
     } else {
-      return _solver.MCFGetFO();
+      MCFClass::FONumber num = _solver.MCFGetFO();
+      if (num == MCFClass::Inf<MCFClass::FONumber>()) {
+        return infinity<Domain>();
+      } else if (num == -MCFClass::Inf<MCFClass::FONumber>()) {
+        return -infinity<Domain>();
+      } else {
+        if (((int)num) == -2147483648)
+          return -infinity<Domain>();
+        return num;
+      }
     }
   }
   void print(std::ostream& cout) const {
@@ -217,30 +223,6 @@ private:
   mutable MCFSimplex _solver;
 };
 
-/*#include "TemplateConstraintMatrix.hpp"
-
-template<typename Domain>
-struct MinimumCostFlow : public Operator<Domain> {
-  MinimumCostFlow() {
-  }
-  Domain solve(const Domain& d) const {
-  
-  }
-  virtual Domain eval(const std::vector<Domain>& arguments) const {
-    if (arguments.size() != 1)
-      throw "Incorrect number of arguments.";
-    return solve(arguments[0]);
-  }
-  void print(std::ostream& cout) const {
-    cout << "minCostFlow";
-  }
-private:
-  TemplateConstraintMatrix& constraint; // T
-  std::vector<Domain> guard; // c
-  std::vector<std::vector<Domain>> multiplication; //A
-  unsigned int row;
-};*/
-
 template<typename T>
 std::ostream& operator<<(std::ostream& cout, const Operator<T>& op) {
   op.print(cout);
diff --git a/impl/VariableAssignment.hpp b/impl/VariableAssignment.hpp
index 08002b8..67896ef 100644
--- a/impl/VariableAssignment.hpp
+++ b/impl/VariableAssignment.hpp
@@ -60,15 +60,17 @@ struct DynamicVariableAssignment : public VariableAssignment<Domain> {
 
   IdSet<Variable<Domain> > get_changed() {
     IdSet<Variable<Domain> > changed;
-    for (typename IdSet<Variable<Domain> >::iterator
-           it = _touched.begin(),
-           ei = _touched.end();
-         it != ei;
-         ++it) {
-      Variable<Domain>& var = _system.variable(*it);
-      if (!_unstable.contains(var) && _old_values[var] != _values[var]) {
-        changed.insert(var);
-        _touched.remove(var);
+    if (_touched.size() > 0) {
+      for (typename IdSet<Variable<Domain> >::iterator
+             it = _touched.begin(),
+             ei = _touched.end();
+           it != ei;
+           ++it) {
+        Variable<Domain>& var = _system.variable(*it);
+        if (!_unstable.contains(var) && _old_values[var] != _values[var]) {
+          changed.insert(var);
+          _touched.remove(var);
+        }
       }
     }
     //_touched.clear();
@@ -88,7 +90,6 @@ private:
       const DynamicMaxStrategy<Domain>& const_strat = _strategy;
       DependencyAssignment assignment(*this, x);
       Domain val = _system[x]->eval(assignment, const_strat);
-      stack_depth--;
 
       if (val != _values[x]) {
         log::fixpoint << x << " = " << val << std::endl;
@@ -108,6 +109,7 @@ private:
         log::fixpoint << indent() << x << " did not change: "
 		      << x << " = " << val << std::endl;
       }
+      stack_depth--;
     } else {
       log::fixpoint << indent() << x << " is stable: "
 		    << x << " = " << _values[x] << std::endl;