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| 1 // Copyright 2014 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 MOJO_PUBLIC_CPP_BINDINGS_CALLBACK_H_ | |
| 6 #define MOJO_PUBLIC_CPP_BINDINGS_CALLBACK_H_ | |
| 7 | |
| 8 #include "mojo/public/cpp/bindings/lib/callback_internal.h" | |
| 9 #include "mojo/public/cpp/bindings/lib/shared_ptr.h" | |
| 10 #include "mojo/public/cpp/bindings/lib/template_util.h" | |
| 11 | |
| 12 namespace mojo { | |
| 13 | |
| 14 template <typename Sig> | |
| 15 class Callback; | |
| 16 | |
| 17 template <typename... Args> | |
| 18 class Callback<void(Args...)> { | |
| 19 public: | |
| 20 struct Runnable { | |
| 21 virtual ~Runnable() {} | |
| 22 virtual void Run( | |
| 23 typename internal::Callback_ParamTraits<Args>::ForwardType...) | |
| 24 const = 0; | |
| 25 }; | |
| 26 | |
| 27 Callback() {} | |
| 28 | |
| 29 // The Callback assumes ownership of |runnable|. | |
| 30 explicit Callback(Runnable* runnable) : sink_(runnable) {} | |
| 31 | |
| 32 // Any class that is copy-constructable and has a compatible Run method may | |
| 33 // be adapted to a Callback using this constructor. | |
| 34 template <typename Sink> | |
| 35 Callback(const Sink& sink) | |
| 36 : sink_(new Adapter<Sink>(sink)) {} | |
| 37 | |
| 38 void Run(typename internal::Callback_ParamTraits<Args>::ForwardType... args) | |
| 39 const { | |
| 40 if (sink_.get()) | |
| 41 sink_->Run(internal::Forward(args)...); | |
| 42 } | |
| 43 | |
| 44 bool is_null() const { return !sink_.get(); } | |
| 45 | |
| 46 void reset() { sink_.reset(); } | |
| 47 | |
| 48 private: | |
| 49 template <typename Sink> | |
| 50 struct Adapter : public Runnable { | |
| 51 explicit Adapter(const Sink& sink) : sink(sink) {} | |
| 52 virtual void Run( | |
| 53 typename internal::Callback_ParamTraits<Args>::ForwardType... args) | |
| 54 const override { | |
| 55 sink.Run(internal::Forward(args)...); | |
| 56 } | |
| 57 Sink sink; | |
| 58 }; | |
| 59 | |
| 60 internal::SharedPtr<Runnable> sink_; | |
| 61 }; | |
| 62 | |
| 63 typedef Callback<void()> Closure; | |
| 64 | |
| 65 } // namespace mojo | |
| 66 | |
| 67 #endif // MOJO_PUBLIC_CPP_BINDINGS_CALLBACK_H_ | |
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