Add a method to check if a signal with the given name exists.

Author: Francois Keith

include/dynamic-graph/entity.h

@@ -84,6 +84,7 @@ namespace dynamicgraph
     }
     virtual const std::string& getClassName  () const = 0;
     virtual std::string getDocString () const;
+    bool hasSignal( const std::string & signame ) const;
     SignalBase<int>& getSignal (const std::string& signalName);
     const SignalBase<int>& getSignal (const std::string& signalName) const;
     std::ostream& displaySignalList(std::ostream& os) const;

src/dgraph/entity.cpp

@@ -149,6 +149,11 @@ std::string Entity::getDocString () const
   return *(sigkey ->second) ;
 
 
+bool Entity::
+hasSignal( const string & signame ) const
+{
+  return (!(signalMap.find(signame) == signalMap.end ()));
+}
 
 SignalBase<int>& Entity::
 getSignal( const string & signame )