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/*
* Copyright (C) 2015-2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/Ref.h>
#include <wtf/RetainReleaseSwift.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/TypeTraits.h>
namespace WTF {
// RefCountable<T> makes any type reference-counted, including move-only types
// In Swift, you can use cell.pointee.method()
// FIXME: becomes largely unnecessary once rdar://162361370 is fixed in Swift/C++
// interop.
template<typename T>
class RefCountable : public ThreadSafeRefCounted<RefCountable<T>> {
public:
template<typename... Arguments>
static Ref<RefCountable> create(Arguments&&... arguments)
{
static_assert(!HasRefPtrMemberFunctions<T>::value, "T should not be RefCounted");
return adoptRef(*new RefCountable(std::forward<Arguments>(arguments)...));
}
RefCountable(T&& value)
: m_value(WTFMove(value))
{
}
#ifdef __swift__
// FIXME: rdar://165684636 means we have to define these at this level of the
// type hierarchy.
void ref() const
{
ThreadSafeRefCounted<RefCountable<T>>::ref();
}
void deref() const
{
ThreadSafeRefCounted<RefCountable<T>>::deref();
}
#endif
T& operator*() LIFETIME_BOUND
{
return m_value;
}
const T& operator*() const LIFETIME_BOUND
{
return m_value;
}
private:
template<typename... Arguments>
RefCountable(Arguments&&... arguments)
: m_value(std::forward<Arguments>(arguments)...)
{
static_assert(!HasRefPtrMemberFunctions<T>::value, "T should not be RefCounted");
}
T m_value;
} SWIFT_SHARED_REFERENCE(.ref, .deref);
} // namespace WTF
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