move utf8_Error to *.h

include/nana/deploy.hpp

@@ -114,6 +114,17 @@ namespace std
 
 namespace nana
 {
+	/// move to *.h ??
+	struct utf8_Error : std::runtime_error
+	{
+		static bool use_throw; ///< def { true }; use carefully - it is a global variable !! \todo initialize from a #define ?
+
+		using std::runtime_error::runtime_error;
+
+		void emit();
+	};
+
+	
 	/// Checks whether a specified text is utf8 encoding
 	bool is_utf8(const char* str, unsigned len);
 	void throw_not_utf8(const std::string& text);