Performance enhancement in Token

Author: HammerMaximilian

fUML-CPP/fuml/src/fuml/semantics/activities/Token.cpp

@@ -33,6 +33,7 @@ TokenPtr Token::transfer(const ActivityNodeActivationPtr& holder)
 	}
 
 	token->holder = holder;
+	this->_isWithdrawn = false;
 	return token;
 } // transfer
 
@@ -45,12 +46,13 @@ void Token::withdraw()
 		TokenPtr thisTokenPtrLocked = this->thisTokenPtr.lock(); // This is done so this token won't be deleted (i.e. it's memory is freed) by the next line in case it is only referenced by it's holder
 		this->holder.lock()->removeToken(this->thisTokenPtr.lock());
 		this->holder.reset();
+		this->_isWithdrawn = true;
 	}
 } // withdraw
 
 bool Token::isWithdrawn()
 {
 	// Test if this token has been withdrawn.
 
-	return this->holder.lock() == nullptr;
+	return this->_isWithdrawn;
 } // isWithdrawn

fUML-CPP/fuml/src/fuml/semantics/activities/Token.h

@@ -20,6 +20,7 @@ namespace fuml::semantics::activities
 
 		private:
 			TokenPtr_w thisTokenPtr;
+			bool _isWithdrawn = false;
 
 		public:
 			virtual ~Token() = 0;