add const qualifiers

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52414 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/timer.h

@@ -60,30 +60,30 @@ public:
     /**
         Returns the ID of the events generated by this timer.
     */
-    int GetId();
+    int GetId() const;
 
     /**
         Returns the current interval for the timer (in milliseconds).
     */
-    int GetInterval();
+    int GetInterval() const;
 
     /**
         Returns the current @e owner of the timer.
         If non-@NULL this is the event handler which will receive the
         @ref overview_wxtimerevent "timer events" when the timer is running.
     */
-    wxEvtHandler GetOwner();
+    wxEvtHandler GetOwner() const;
 
     /**
         Returns @true if the timer is one shot, i.e. if it will stop after firing the
         first notification automatically.
     */
-    bool IsOneShot();
+    bool IsOneShot() const;
 
     /**
         Returns @true if the timer is running, @false if it is stopped.
     */
-    bool IsRunning();
+    bool IsRunning() const;
 
     /**
         This member should be overridden by the user if the default constructor was
@@ -175,10 +175,10 @@ public:
     /**
         Returns the interval of the timer which generated this event.
     */
-    int GetInterval();
+    int GetInterval() const;
 
     /**
         Returns the timer object which generated this event.
     */
-    wxTimer GetTimer();
+    wxTimer GetTimer() const;
 };