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// Copyright 2014 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 MOJO_PUBLIC_CPP_BINDINGS_CALLBACK_H_
#define MOJO_PUBLIC_CPP_BINDINGS_CALLBACK_H_
#include "mojo/public/cpp/bindings/lib/callback_internal.h"
#include "mojo/public/cpp/bindings/lib/shared_ptr.h"
#include "mojo/public/cpp/bindings/lib/template_util.h"
namespace mojo {
template <typename Sig>
class Callback;
template <typename... Args>
class Callback<void(Args...)> {
public:
struct Runnable {
virtual ~Runnable() {}
virtual void Run(
typename internal::Callback_ParamTraits<Args>::ForwardType...)
const = 0;
};
Callback() {}
// The Callback assumes ownership of |runnable|.
explicit Callback(Runnable* runnable) : sink_(runnable) {}
// Any class that is copy-constructable and has a compatible Run method may
// be adapted to a Callback using this constructor.
template <typename Sink>
Callback(const Sink& sink)
: sink_(new Adapter<Sink>(sink)) {}
void Run(typename internal::Callback_ParamTraits<Args>::ForwardType... args)
const {
if (sink_.get())
sink_->Run(internal::Forward(args)...);
}
bool is_null() const { return !sink_.get(); }
void reset() { sink_.reset(); }
private:
template <typename Sink>
struct Adapter : public Runnable {
explicit Adapter(const Sink& sink) : sink(sink) {}
virtual void Run(
typename internal::Callback_ParamTraits<Args>::ForwardType... args)
const override {
sink.Run(internal::Forward(args)...);
}
Sink sink;
};
internal::SharedPtr<Runnable> sink_;
};
typedef Callback<void()> Closure;
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_CALLBACK_H_
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