1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef BASE_CALLBACK_FORWARD_H_
6 #define BASE_CALLBACK_FORWARD_H_
7 
8 namespace base {
9 
10 template <typename Signature>
11 class OnceCallback;
12 
13 template <typename Signature>
14 class RepeatingCallback;
15 
16 template <typename Signature>
17 using Callback = RepeatingCallback<Signature>;
18 
19 // Syntactic sugar to make Callback<void()> easier to declare since it
20 // will be used in a lot of APIs with delayed execution.
21 using OnceClosure = OnceCallback<void()>;
22 using RepeatingClosure = RepeatingCallback<void()>;
23 using Closure = Callback<void()>;
24 
25 }  // namespace base
26 
27 #endif  // BASE_CALLBACK_FORWARD_H_
28