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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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59
dom/bindings/RootedRefPtr.h Normal file
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* An implementation of Rooted for RefPtr<T>. This works by assuming that T has
* a Trace() method defined on it which will trace whatever things inside the T
* instance need tracing.
*
* This implementation has one serious drawback: operator= doesn't work right
* because it's declared on Rooted directly and expects the type Rooted is
* templated over.
*/
#ifndef mozilla_RootedRefPtr_h__
#define mozilla_RootedRefPtr_h__
#include "mozilla/RefPtr.h"
#include "js/GCPolicyAPI.h"
#include "js/RootingAPI.h"
namespace JS {
template<typename T>
struct GCPolicy<RefPtr<T>>
{
static RefPtr<T> initial() {
return RefPtr<T>();
}
static void trace(JSTracer* trc, RefPtr<T>* tp, const char* name)
{
if (*tp) {
(*tp)->Trace(trc);
}
}
};
} // namespace JS
namespace js {
template<typename T>
struct RootedBase<RefPtr<T>>
{
operator RefPtr<T>& () const
{
auto& self = *static_cast<const JS::Rooted<RefPtr<T>>*>(this);
return self.get();
}
operator T*() const
{
auto& self = *static_cast<const JS::Rooted<RefPtr<T>>*>(this);
return self.get();
}
};
} // namespace js
#endif /* mozilla_RootedRefPtr_h__ */