63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
// Copyright 2014 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef LIBBRILLO_BRILLO_BIND_LAMBDA_H_
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#define LIBBRILLO_BRILLO_BIND_LAMBDA_H_
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#include <base/bind.h>
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////////////////////////////////////////////////////////////////////////////////
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// This file is an extension to base/bind_internal.h and adds a RunnableAdapter
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// class specialization that wraps a functor (including lambda objects), so
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// they can be used in base::Callback/base::Bind constructs.
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// By including this file you will gain the ability to write expressions like:
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// base::Callback<int(int)> callback = base::Bind([](int value) {
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// return value * value;
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// });
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////////////////////////////////////////////////////////////////////////////////
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namespace base {
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namespace internal {
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// LambdaAdapter is a helper class that specializes on different function call
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// signatures and provides the RunType and Run() method required by
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// RunnableAdapter<> class.
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template <typename Lambda, typename Sig>
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class LambdaAdapter;
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// R(...)
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template <typename Lambda, typename R, typename... Args>
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class LambdaAdapter<Lambda, R(Lambda::*)(Args... args)> {
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public:
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typedef R(RunType)(Args...);
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explicit LambdaAdapter(Lambda lambda) : lambda_(lambda) {}
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R Run(Args... args) { return lambda_(std::forward<Args>(args)...); }
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private:
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Lambda lambda_;
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};
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// R(...) const
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template <typename Lambda, typename R, typename... Args>
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class LambdaAdapter<Lambda, R(Lambda::*)(Args... args) const> {
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public:
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typedef R(RunType)(Args...);
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explicit LambdaAdapter(Lambda lambda) : lambda_(lambda) {}
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R Run(Args... args) { return lambda_(std::forward<Args>(args)...); }
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private:
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Lambda lambda_;
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};
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template <typename Lambda>
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class RunnableAdapter
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: public LambdaAdapter<Lambda, decltype(&Lambda::operator())> {
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public:
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explicit RunnableAdapter(Lambda lambda)
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: LambdaAdapter<Lambda, decltype(&Lambda::operator())>(lambda) {}
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};
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} // namespace internal
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} // namespace base
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#endif // LIBBRILLO_BRILLO_BIND_LAMBDA_H_
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