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/*
* Copyright (C) 2020 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 <memory>
#include <wtf/CompactPointerTuple.h>
#include <wtf/Noncopyable.h>
namespace WTF {
template<typename T, typename Type, typename Deleter = std::default_delete<T>> class CompactUniquePtrTuple;
template<typename T, typename Type, typename... Args>
ALWAYS_INLINE CompactUniquePtrTuple<T, Type> makeCompactUniquePtr(Args&&... args)
{
return CompactUniquePtrTuple<T, Type>(makeUnique<T>(std::forward<Args>(args)...));
}
template<typename T, typename Type, typename Deleter, typename... Args>
ALWAYS_INLINE CompactUniquePtrTuple<T, Type, Deleter> makeCompactUniquePtr(Args&&... args)
{
return CompactUniquePtrTuple<T, Type, Deleter>(makeUnique<T>(std::forward<Args>(args)...));
}
template<typename T, typename Type, typename Deleter>
class CompactUniquePtrTuple final {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(CompactUniquePtrTuple);
static_assert(::allowCompactPointers<T>());
public:
CompactUniquePtrTuple() = default;
template <typename U, typename UDeleter, typename = std::enable_if_t<std::is_same<UDeleter, Deleter>::value || std::is_same<UDeleter, std::default_delete<U>>::value>>
CompactUniquePtrTuple(CompactUniquePtrTuple<U, Type, UDeleter>&& other)
: m_data { std::exchange(other.m_data, { }) }
{
}
~CompactUniquePtrTuple()
{
setPointer(nullptr);
}
template <typename U, typename UDeleter, typename = std::enable_if_t<std::is_same<UDeleter, Deleter>::value || std::is_same<UDeleter, std::default_delete<U>>::value>>
CompactUniquePtrTuple<T, Type, Deleter>& operator=(CompactUniquePtrTuple<U, Type, UDeleter>&& other)
{
CompactUniquePtrTuple moved { WTFMove(other) };
std::swap(m_data, moved.m_data);
return *this;
}
T* pointer() const { return m_data.pointer(); }
std::unique_ptr<T, Deleter> moveToUniquePtr()
{
T* pointer = m_data.pointer();
m_data.setPointer(nullptr);
return std::unique_ptr<T, Deleter>(pointer);
}
void setPointer(std::nullptr_t)
{
deletePointer();
m_data.setPointer(nullptr);
}
template <typename U, typename UDeleter, typename = std::enable_if_t<std::is_same<UDeleter, Deleter>::value || std::is_same<UDeleter, std::default_delete<U>>::value>>
void setPointer(std::unique_ptr<U, UDeleter>&& pointer)
{
deletePointer();
m_data.setPointer(pointer.release());
}
Type type() const { return m_data.type(); }
void setType(Type type)
{
m_data.setType(type);
}
private:
CompactUniquePtrTuple(std::unique_ptr<T>&& pointer)
{
m_data.setPointer(pointer.release());
}
void deletePointer()
{
if (T* pointer = m_data.pointer())
Deleter()(pointer);
}
template<typename U, typename E, typename... Args> friend CompactUniquePtrTuple<U, E> makeCompactUniquePtr(Args&&... args);
template<typename U, typename E, typename D, typename... Args> friend CompactUniquePtrTuple<U, E, D> makeCompactUniquePtr(Args&&... args);
template <typename, typename, typename> friend class CompactUniquePtrTuple;
CompactPointerTuple<T*, Type> m_data;
};
} // namespace WTF
using WTF::CompactUniquePtrTuple;
using WTF::makeCompactUniquePtr;
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