ladybird/AK/NeverDestroyed.h
Andreas Kling ae3ffdd521 AK: Make it possible to not using AK classes into the global namespace
This patch adds the `USING_AK_GLOBALLY` macro which is enabled by
default, but can be overridden by build flags.

This is a step towards integrating Jakt and AK types.
2022-11-26 15:51:34 +01:00

46 lines
904 B
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Noncopyable.h>
#include <AK/Types.h>
namespace AK {
template<typename T>
class NeverDestroyed {
AK_MAKE_NONCOPYABLE(NeverDestroyed);
AK_MAKE_NONMOVABLE(NeverDestroyed);
public:
template<typename... Args>
NeverDestroyed(Args&&... args)
{
new (storage) T(forward<Args>(args)...);
}
~NeverDestroyed() = default;
T* operator->() { return &get(); }
const T* operator->() const { return &get(); }
T& operator*() { return get(); }
const T& operator*() const { return get(); }
T& get() { return reinterpret_cast<T&>(storage); }
const T& get() const { return reinterpret_cast<T&>(storage); }
private:
alignas(T) u8 storage[sizeof(T)];
};
}
#if USING_AK_GLOBALLY
using AK::NeverDestroyed;
#endif