Use variadic template for screen handler's AddCallback.

chrome/browser/ui/webui/chromeos/login/base_screen_handler.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_
 
 #include <string>
 
 #include "base/bind.h"
@@ skipping 111 matching lines @@
 
   // Shortcut methods for adding WebUI callbacks.
   template<typename T>
   void AddRawCallback(const std::string& name,
                       void (T::*method)(const base::ListValue* args)) {
     web_ui()->RegisterMessageCallback(
         name,
         base::Bind(method, base::Unretained(static_cast<T*>(this))));
   }
 
-  template<typename T>
-  void AddCallback(const std::string& name, void (T::*method)()) {
-    base::Callback<void()> callback =
+  template<typename T, typename... Args>
+  void AddCallback(const std::string& name, void (T::*method)(Args...)) {
+    base::Callback<void(Args...)> callback =
         base::Bind(method, base::Unretained(static_cast<T*>(this)));
     web_ui()->RegisterMessageCallback(
-        name, base::Bind(&::login::CallbackWrapper0, callback));
-  }
-
-  template<typename T, typename A1>
-  void AddCallback(const std::string& name, void (T::*method)(A1 arg1)) {
-    base::Callback<void(A1)> callback =
-        base::Bind(method, base::Unretained(static_cast<T*>(this)));
-    web_ui()->RegisterMessageCallback(
-        name, base::Bind(&::login::CallbackWrapper1<A1>, callback));
-  }
-
-  template<typename T, typename A1, typename A2>
-  void AddCallback(const std::string& name,
-                   void (T::*method)(A1 arg1, A2 arg2)) {
-    base::Callback<void(A1, A2)> callback =
-        base::Bind(method, base::Unretained(static_cast<T*>(this)));
-    web_ui()->RegisterMessageCallback(
-        name, base::Bind(&::login::CallbackWrapper2<A1, A2>, callback));
-  }
-
-  template<typename T, typename A1, typename A2, typename A3>
-  void AddCallback(const std::string& name,
-                   void (T::*method)(A1 arg1, A2 arg2, A3 arg3)) {
-    base::Callback<void(A1, A2, A3)> callback =
-        base::Bind(method, base::Unretained(static_cast<T*>(this)));
-    web_ui()->RegisterMessageCallback(
-        name, base::Bind(&::login::CallbackWrapper3<A1, A2, A3>, callback));
-  }
-
-  template<typename T, typename A1, typename A2, typename A3, typename A4>
-  void AddCallback(const std::string& name,
-                   void (T::*method)(A1 arg1, A2 arg2, A3 arg3, A4 arg4)) {
-    base::Callback<void(A1, A2, A3, A4)> callback =
-        base::Bind(method, base::Unretained(static_cast<T*>(this)));
-    web_ui()->RegisterMessageCallback(
-        name, base::Bind(&::login::CallbackWrapper4<A1, A2, A3, A4>, callback));
-  }
-
-  template <typename T,
-            typename A1,
-            typename A2,
-            typename A3,
-            typename A4,
-            typename A5>
-  void AddCallback(
-      const std::string& name,
-      void (T::*method)(A1 arg1, A2 arg2, A3 arg3, A4 arg4, A5 arg5)) {
-    base::Callback<void(A1, A2, A3, A4, A5)> callback =
-        base::Bind(method, base::Unretained(static_cast<T*>(this)));
-    web_ui()->RegisterMessageCallback(
-        name,
-        base::Bind(&::login::CallbackWrapper5<A1, A2, A3, A4, A5>, callback));
+        name, base::Bind(&::login::CallbackWrapper<Args...>, callback));
   }
 
   template <typename Method>
   void AddPrefixedCallback(const std::string& unprefixed_name,
                            const Method& method) {
     AddCallback(FullMethodPath(unprefixed_name), method);
   }
 
   // Called when the page is ready and handler can do initialization.
   virtual void Initialize() = 0;
@@ skipping 40 matching lines @@
 
   // Pending changes to context which will be sent when the page will be ready.
   base::DictionaryValue pending_context_changes_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_