add default assignment operator for various classes (#1888)

clients/roscpp/include/ros/publisher.h

@@ -50,6 +50,7 @@ namespace ros
     Publisher() {}
     Publisher(const Publisher& rhs);
     ~Publisher();
+    Publisher& operator=(const Publisher& other) = default;
 
     /**
      * \brief Publish a message on the topic associated with this Publisher.

clients/roscpp/include/ros/service_client.h

@@ -46,6 +46,7 @@ class ROSCPP_DECL ServiceClient
   ServiceClient(const std::string& service_name, bool persistent, const M_string& header_values, const std::string& service_md5sum);
   ServiceClient(const ServiceClient& rhs);
   ~ServiceClient();
+  ServiceClient& operator=(const ServiceClient& other) = default;
 
   /**
    * @brief Call the service aliased by this handle with the specified request/response messages.

clients/roscpp/include/ros/service_server.h

@@ -48,6 +48,7 @@ class ROSCPP_DECL ServiceServer
   ServiceServer() {}
   ServiceServer(const ServiceServer& rhs);
   ~ServiceServer();
+  ServiceServer& operator=(const ServiceServer& other) = default;
 
   /**
    * \brief Unadvertise the service associated with this ServiceServer

clients/roscpp/include/ros/steady_timer.h

@@ -49,6 +49,7 @@ class ROSCPP_DECL SteadyTimer
   SteadyTimer() {}
   SteadyTimer(const SteadyTimer& rhs);
   ~SteadyTimer();
+  SteadyTimer& operator=(const SteadyTimer& other) = default;
 
   /**
    * \brief Start the timer.  Does nothing if the timer is already started.

clients/roscpp/include/ros/subscriber.h

@@ -49,6 +49,7 @@ class ROSCPP_DECL Subscriber
   Subscriber() {}
   Subscriber(const Subscriber& rhs);
   ~Subscriber();
+  Subscriber& operator=(const Subscriber& other) = default;
 
   /**
    * \brief Unsubscribe the callback associated with this Subscriber

clients/roscpp/include/ros/timer.h

@@ -49,6 +49,7 @@ class ROSCPP_DECL Timer
   Timer() {}
   Timer(const Timer& rhs);
   ~Timer();
+  Timer& operator=(const Timer& other) = default;
 
   /**
    * \brief Start the timer.  Does nothing if the timer is already started.

clients/roscpp/include/ros/wall_timer.h

@@ -49,6 +49,7 @@ class ROSCPP_DECL WallTimer
   WallTimer() {}
   WallTimer(const WallTimer& rhs);
   ~WallTimer();
+  WallTimer& operator=(const WallTimer& other) = default;
 
   /**
    * \brief Start the timer.  Does nothing if the timer is already started.