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// Copyright 2015 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 CrossThreadFunctional_h
#define CrossThreadFunctional_h
#include "base/bind.h"
#include "platform/CrossThreadCopier.h"
#include "wtf/Functional.h"
#include <type_traits>
namespace blink {
// crossThreadBind() is bind() for cross-thread task posting.
// crossThreadBind() applies CrossThreadCopier to the arguments.
//
// Example:
// void func1(int, const String&);
// f = crossThreadBind(func1, 42, str);
// func1(42, str2) will be called when |f()| is executed,
// where |str2| is a deep copy of |str| (created by str.isolatedCopy()).
//
// crossThreadBind(str) is similar to bind(str.isolatedCopy()), but the latter
// is NOT thread-safe due to temporary objects (https://crbug.com/390851).
//
// Don't (if you pass the task across threads):
// bind(func1, 42, str);
// bind(func1, 42, str.isolatedCopy());
template <typename FunctionType, typename... Ps>
std::unique_ptr<Function<base::MakeUnboundRunType<FunctionType, Ps...>,
WTF::CrossThreadAffinity>>
crossThreadBind(FunctionType function, Ps&&... parameters) {
return WTF::bindInternal<WTF::CrossThreadAffinity>(
function, CrossThreadCopier<typename std::decay<Ps>::type>::copy(
std::forward<Ps>(parameters))...);
}
} // namespace blink
#endif // CrossThreadFunctional_h
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