diff --git a/a8/a8.h b/a8/a8.h
index 40ec32e..d0a29ac 100644
--- a/a8/a8.h
+++ b/a8/a8.h
@@ -3,6 +3,7 @@
 
 #include <assert.h>
 
+#include <any>
 #include <string>
 #include <vector>
 #include <map>
@@ -13,6 +14,7 @@
 #include <functional>
 #include <initializer_list>
 
+#include <a8/args.h>
 #include <a8/types.h>
 #include <a8/list.h>
 #include <a8/xvalue.h>
@@ -31,6 +33,14 @@ namespace std
     class condition_variable;
 };
 
+namespace google
+{
+    namespace protobuf
+    {
+        class Message;
+    }
+}
+
 #define NEW_NET
 #define A8_SAFE_DELETE(p) { if(p){delete(p);  (p)=nullptr;} }
 #define A8_DEFINE_RANGE_BIT(type, begin, end) ((((type)1) << (end + 1)) - 1) & (~((((type)1) << (begin + 0)) - 1))
diff --git a/a8/args.h b/a8/args.h
new file mode 100644
index 0000000..e6630ea
--- /dev/null
+++ b/a8/args.h
@@ -0,0 +1,20 @@
+#ifndef A8_ARGS_H
+#define A8_ARGS_H
+
+namespace a8
+{
+    class Args
+    {
+    public:
+
+        Args(std::vector<std::any> args):args_(std::move(args)) {};
+
+        template <typename T>
+        T Get(size_t index) const { return std::any_cast<T>(args_.at(index));};
+
+    private:
+        std::vector<std::any> args_;
+    };
+}
+
+#endif
diff --git a/a8/types.h b/a8/types.h
index 1122210..650cb81 100644
--- a/a8/types.h
+++ b/a8/types.h
@@ -14,6 +14,8 @@ namespace a8
         SendQueueNode* next = nullptr;
     };
 
+    typedef std::function<void(const a8::Args&)> CommonCbProc;
+
     const int INVALID_FD = -1;
     const int INVALID_SOCKET = -1;
     const int INVALID_SOCKET_HANDLE = 0;