ignore warnings which are generated by -Weffc++

include/nana/gui/widgets/checkbox.hpp

@@ -12,6 +12,8 @@
 
 #ifndef NANA_GUI_WIDGET_CHECKBOX_HPP
 #define NANA_GUI_WIDGET_CHECKBOX_HPP
+#include <nana/push_ignore_diagnostic>
+
 #include "widget.hpp"
 #include <vector>
 #include <memory>
@@ -106,5 +108,6 @@ namespace drawerbase
 		std::vector<element_tag> ui_container_;
 	};
 }//end namespace nana
+#include <nana/pop_ignore_diagnostic>
 
 #endif