Context references buffer and window with a safe_ptr

src/context.hh

@@ -33,8 +33,8 @@ struct Context
     }
     bool has_window() const { return m_window; }
 public:
-    Window* m_window;
+    safe_ptr<Window> m_window;
-    Buffer* m_buffer;
+    safe_ptr<Buffer> m_buffer;
 
 };
 

src/main.cc

@@ -503,5 +503,6 @@ int main(int argc, char* argv[])
         puts(error.description().c_str());
         return -1;
     }
+    main_context = Context();
     return 0;
 }

src/window.hh

@@ -21,7 +21,7 @@ class HighlighterGroup;
 // to the editing ones already provided by the Editor class.
 // Display can be customized through the use of highlighters handled by
 // the window's HighlighterGroup
-class Window : public Editor, public OptionManagerWatcher
+class Window : public Editor, public OptionManagerWatcher, public SafeCountable
 {
 public:
     ~Window();