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 namespace internal { 10 11 // CopyMode is used to control the copyablity of a Callback. 12 // MoveOnly indicates the Callback is not copyable but movable, and Copyable 13 // indicates it is copyable and movable. 14 enum class CopyMode { 15 MoveOnly, 16 Copyable, 17 }; 18 19 enum class RepeatMode { 20 Once, 21 Repeating, 22 }; 23 24 } // namespace internal 25 26 template <typename Signature, 27 internal::CopyMode copy_mode = internal::CopyMode::Copyable, 28 internal::RepeatMode repeat_mode = internal::RepeatMode::Repeating> 29 class Callback; 30 31 // Syntactic sugar to make Callback<void()> easier to declare since it 32 // will be used in a lot of APIs with delayed execution. 33 using Closure = Callback<void()>; 34 35 template <typename Signature> 36 using OnceCallback = Callback<Signature, 37 internal::CopyMode::MoveOnly, 38 internal::RepeatMode::Once>; 39 template <typename Signature> 40 using RepeatingCallback = Callback<Signature, 41 internal::CopyMode::Copyable, 42 internal::RepeatMode::Repeating>; 43 using OnceClosure = OnceCallback<void()>; 44 using RepeatingClosure = RepeatingCallback<void()>; 45 46 } // namespace base 47 48 #endif // BASE_CALLBACK_FORWARD_H_ 49
