diff --git a/include/nana/c++defines.hpp b/include/nana/c++defines.hpp
index 98c23dc4..fa43923d 100644
--- a/include/nana/c++defines.hpp
+++ b/include/nana/c++defines.hpp
@@ -203,6 +203,7 @@
 #if (defined(_MSC_VER) && (_MSC_VER >= 1912) && defined(_MSVC_LANG) && _MSVC_LANG>= 201703)
 #	define _nana_cxx_constexpr_if
 #	define _nana_cxx_folding_expression
+#	define _nana_cxx_nested_namespace_definition
 #endif
 
 
diff --git a/include/nana/gui/widgets/detail/widget_iterator.hpp b/include/nana/gui/widgets/detail/widget_iterator.hpp
new file mode 100644
index 00000000..c78e5d4d
--- /dev/null
+++ b/include/nana/gui/widgets/detail/widget_iterator.hpp
@@ -0,0 +1,36 @@
+/*
+ *	A Widget Iterator Template
+ *	Copyright(C) 2017 Jinhao(cnjinhao@hotmail.com)
+ *
+ *	Distributed under the Boost Software License, Version 1.0.
+ *	(See accompanying file LICENSE_1_0.txt or copy at
+ *	http://www.boost.org/LICENSE_1_0.txt)
+ *
+ *	@file: nana/gui/widgets/detail/widget_iterator.hpp
+ *  @description: widget_iterator is the base class provided to simplify definitions of the required types for widget iterators.
+ *	It is provided because of deprecation of std::iterator in C++17
+ */
+#ifndef NANA_GUI_WIDGET_ITERATOR_INCLUDED
+#define NANA_GUI_WIDGET_ITERATOR_INCLUDED
+
+#include <cstddef>	//provides std::ptrdiff_t
+
+
+namespace nana {
+	namespace widgets {
+		namespace detail
+		{
+			template<typename Category, typename T>
+			class widget_iterator
+			{
+				using iterator_category = Category;
+				using value_type = T;
+				using difference_type = std::ptrdiff_t;
+				using pointer = T * ;
+				using reference = T & ;
+			};
+		}
+	}
+}
+
+#endif
diff --git a/include/nana/gui/widgets/listbox.hpp b/include/nana/gui/widgets/listbox.hpp
index 71280b7e..0137ff51 100644
--- a/include/nana/gui/widgets/listbox.hpp
+++ b/include/nana/gui/widgets/listbox.hpp
@@ -23,6 +23,7 @@
 
 #include "widget.hpp"
 #include "detail/inline_widget.hpp"
+#include "detail/widget_iterator.hpp"
 #include <nana/pat/abstract_factory.hpp>
 #include <nana/concepts.hpp>
 #include <nana/key_type.hpp>
@@ -802,7 +803,8 @@ namespace nana
 			/// operate with absolute positions and contain only the position but montain pointers to parts of the real items 
 			/// item_proxy self, it references and iterators are not invalidated by sort()
 			class item_proxy
-				: public std::iterator<std::input_iterator_tag, item_proxy>
+				//: public std::iterator<std::input_iterator_tag, item_proxy>	//deprecated
+				: public ::nana::widgets::detail::widget_iterator<std::input_iterator_tag, item_proxy>
 			{
 			public:
 				item_proxy(essence*, const index_pair& = index_pair{npos, npos});
@@ -976,7 +978,8 @@ namespace nana
 			};
 
 			class cat_proxy
-				: public std::iterator < std::input_iterator_tag, cat_proxy >
+				//: public std::iterator<std::input_iterator_tag, cat_proxy>	//deprecated
+				: public ::nana::widgets::detail::widget_iterator<std::input_iterator_tag, cat_proxy>
 			{
 			public:
 				using inline_notifier_interface = drawerbase::listbox::inline_notifier_interface;