mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-26 20:55:35 +03:00
80a228383b
The previous version had a sequence of calls that are likely not optimized out, while this version is strictly a sequence of static type conversion which are always fully optimized out.
66 lines
1.4 KiB
C++
66 lines
1.4 KiB
C++
/*
|
|
* Copyright (c) 2022, Tim Schumacher <timschumi@gmx.de>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/NonnullOwnPtr.h>
|
|
#include <AK/Variant.h>
|
|
|
|
namespace AK {
|
|
|
|
template<typename T>
|
|
class MaybeOwned {
|
|
AK_MAKE_NONCOPYABLE(MaybeOwned);
|
|
|
|
public:
|
|
template<DerivedFrom<T> U>
|
|
MaybeOwned(NonnullOwnPtr<U> handle)
|
|
: m_handle(static_cast<NonnullOwnPtr<T>&&>(move(handle)))
|
|
{
|
|
}
|
|
|
|
// This is made `explicit` to not accidentally create a non-owning MaybeOwned,
|
|
// which may not always be intended.
|
|
explicit MaybeOwned(T& handle)
|
|
: m_handle(&handle)
|
|
{
|
|
}
|
|
|
|
MaybeOwned(MaybeOwned&&) = default;
|
|
MaybeOwned& operator=(MaybeOwned&&) = default;
|
|
|
|
T* ptr()
|
|
{
|
|
if (m_handle.template has<T*>())
|
|
return m_handle.template get<T*>();
|
|
else
|
|
return m_handle.template get<NonnullOwnPtr<T>>();
|
|
}
|
|
|
|
T const* ptr() const
|
|
{
|
|
if (m_handle.template has<T*>())
|
|
return m_handle.template get<T*>();
|
|
else
|
|
return m_handle.template get<NonnullOwnPtr<T>>();
|
|
}
|
|
|
|
T* operator->() { return ptr(); }
|
|
T const* operator->() const { return ptr(); }
|
|
|
|
T& operator*() { return *ptr(); }
|
|
T const& operator*() const { return *ptr(); }
|
|
|
|
private:
|
|
Variant<NonnullOwnPtr<T>, T*> m_handle;
|
|
};
|
|
|
|
}
|
|
|
|
#if USING_AK_GLOBALLY
|
|
using AK::MaybeOwned;
|
|
#endif
|