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/*
* Copyright (C) 2016 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. AND ITS CONTRIBUTORS ``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 ITS 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 <memory>
#include <wtf/Assertions.h>
#include <wtf/GetPtr.h>
#include <wtf/TypeCasts.h>
namespace WTF {
template<typename T> class UniqueRef;
template<typename T, class... Args>
UniqueRef<T> makeUniqueRefWithoutFastMallocCheck(Args&&... args)
{
return UniqueRef<T>(*new T(std::forward<Args>(args)...));
}
template<class T, class... Args>
UniqueRef<T> makeUniqueRefWithoutRefCountedCheck(Args&&... args)
{
static_assert(std::is_same<typename T::WTFIsFastMallocAllocated, int>::value, "T should use FastMalloc (WTF_MAKE_FAST_ALLOCATED)");
return makeUniqueRefWithoutFastMallocCheck<T>(std::forward<Args>(args)...);
}
template<typename T, class... Args>
UniqueRef<T> makeUniqueRef(Args&&... args)
{
static_assert(std::is_same<typename T::WTFIsFastMallocAllocated, int>::value, "T should use FastMalloc (WTF_MAKE_FAST_ALLOCATED)");
static_assert(!HasRefPtrMemberFunctions<T>::value, "T should not be RefCounted");
return makeUniqueRefWithoutFastMallocCheck<T>(std::forward<Args>(args)...);
}
template<typename T>
UniqueRef<T> makeUniqueRefFromNonNullUniquePtr(std::unique_ptr<T>&& ptr)
{
return UniqueRef<T>(WTFMove(ptr));
}
template<typename T>
class UniqueRef {
public:
template <typename U>
UniqueRef(UniqueRef<U>&& other)
: m_ref(other.m_ref.release())
{
ASSERT(m_ref);
}
explicit UniqueRef(T& other)
: m_ref(&other)
{
ASSERT(m_ref);
}
T* ptr() const RETURNS_NONNULL { ASSERT(m_ref); return m_ref.get(); }
T& get() const { ASSERT(m_ref); return *m_ref; }
T* operator&() const { ASSERT(m_ref); return m_ref.get(); }
T* operator->() const { ASSERT(m_ref); return m_ref.get(); }
operator T&() const { ASSERT(m_ref); return *m_ref; }
T& operator*() const { ASSERT(m_ref); return *m_ref.get(); }
std::unique_ptr<T> moveToUniquePtr() { return WTFMove(m_ref); }
explicit UniqueRef(HashTableEmptyValueType) { }
bool isHashTableEmptyValue() const { return !m_ref; }
private:
template<class U, class... Args> friend UniqueRef<U> makeUniqueRefWithoutFastMallocCheck(Args&&...);
template<class U> friend UniqueRef<U> makeUniqueRefFromNonNullUniquePtr(std::unique_ptr<U>&&);
template<class U> friend class UniqueRef;
explicit UniqueRef(std::unique_ptr<T>&& ptr)
: m_ref(WTFMove(ptr))
{
ASSERT(m_ref);
}
std::unique_ptr<T> m_ref;
};
template <typename T>
struct GetPtrHelper<UniqueRef<T>> {
using PtrType = T*;
using UnderlyingType = T;
static T* getPtr(const UniqueRef<T>& p) { return const_cast<T*>(p.ptr()); }
};
template <typename T>
struct IsSmartPtr<UniqueRef<T>> {
static constexpr bool value = true;
static constexpr bool isNullable = false;
};
template<typename ExpectedType, typename ArgType>
inline bool is(UniqueRef<ArgType>& source)
{
return is<ExpectedType>(source.get());
}
template<typename ExpectedType, typename ArgType>
inline bool is(const UniqueRef<ArgType>& source)
{
return is<ExpectedType>(source.get());
}
} // namespace WTF
using WTF::UniqueRef;
using WTF::makeUniqueRef;
using WTF::makeUniqueRefWithoutFastMallocCheck;
using WTF::makeUniqueRefWithoutRefCountedCheck;
using WTF::makeUniqueRefFromNonNullUniquePtr;
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