integrate place with root widget

include/nana/gui/place.hpp

@@ -100,7 +100,7 @@ namespace nana
 		};
 	public:
         ///  reference to a field manipulator which refers to a field object created by place 
-		typedef field_interface & field_reference;
+		using field_reference = field_interface &;
 
 		place();
 		place(window);///< Attaches to a specified widget.

include/nana/gui/widgets/widget.hpp

@@ -14,11 +14,10 @@
 #define NANA_GUI_WIDGET_HPP
 
 #include <nana/push_ignore_diagnostic>
-#include "../basis.hpp"
+#include <nana/gui/place.hpp>
 #include "../programming_interface.hpp"
 #include <nana/internationalization.hpp>
 #include <nana/gui/detail/drawer.hpp>
-#include <functional>
 
 namespace nana
 {
@@ -392,6 +391,33 @@ namespace nana
 		{
 			return API::window_outline_size(handle());
 		}
+
+		place & get_place()
+		{
+			if (this->empty())
+				throw std::runtime_error("form::get_plac: the form has destroyed.");
+
+			if (!place_)
+				place_.reset(new place{ *this });
+
+			return *place_;
+		}
+
+		void div(const char* div_text)
+		{
+			get_place().div(div_text);
+		}
+
+		place::field_reference operator[](const char* field_name)
+		{
+			return get_place()[field_name];
+		}
+
+		void collocate() noexcept
+		{
+			if (place_)
+				place_->collocate();
+		}
 	protected:
 		DrawerTrigger& get_drawer_trigger()
 		{
@@ -421,6 +447,7 @@ namespace nana
 		DrawerTrigger					trigger_;
 		std::shared_ptr<Events>			events_;
 		std::unique_ptr<scheme_type>	scheme_;
+		std::unique_ptr<place>			place_;
 	};//end class widget_object<root_tag>
 
 	           /// Base class of all the classes defined as a frame window. \see nana::frame

include/nana/key_type.hpp

@@ -34,55 +34,55 @@ namespace nana
 		template<typename T>
 		struct type_escape
 		{
-			typedef T type;
+			using type = T;
 		};
 
 		template<>
 		struct type_escape<char*>
 		{
-			typedef std::string type;
+			using type = ::std::string;
 		};
 
 		template<>
 		struct type_escape<const char*>
 		{
-			typedef std::string type;
+			using type = ::std::string;
 		};
 
 		template<int Size>
 		struct type_escape<char[Size]>
 		{
-			typedef std::string type;
+			using type = ::std::string;
 		};
 
 		template<int Size>
 		struct type_escape<const char[Size]>
 		{
-			typedef std::string type;
+			using type = ::std::string;
 		};
 
 		template<>
 		struct type_escape<wchar_t*>
 		{
-			typedef std::wstring type;
+			using type = ::std::wstring;
 		};
 
 		template<>
 		struct type_escape<const wchar_t*>
 		{
-			typedef std::wstring type;
+			using type = ::std::wstring;
 		};
 
 		template<int Size>
 		struct type_escape<wchar_t[Size]>
 		{
-			typedef std::wstring type;
+			using type = ::std::wstring;
 		};
 
 		template<int Size>
 		struct type_escape<const wchar_t[Size]>
 		{
-			typedef std::wstring type;
+			using type = ::std::wstring;
 		};
 	}