(svn r16581) -Codechange: unify the access to Engine::lifelength.

src/engine.cpp

@@ -315,6 +315,16 @@ uint Engine::GetDisplayMaxTractiveEffort() const
 	}
 }
 
+/**
+ * Returns the vehicle's life length in days.
+ * @return the life length
+ */
+Date Engine::GetLifeLengthInDays() const
+{
+	/* Assume leap years; this gives the player a bit more than the given amount of years, but never less. */
+	return this->lifelength * DAYS_IN_LEAP_YEAR;
+}
+
 /**
  * Initializes the EngineOverrideManager with the default engines.
  */