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AK: Introduce IntrusiveListRelaxedConst

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This container is the same as IntrusiveList, except that it allows
modifications to the elements even if the reference to the
IntrusiveList itself is const, by returning mutable iterators. This
represents a use-case where we want to allow modifications to the
elements while keeping the list itself immutable.

This behavior is explicitely opt-in by using IntrusiveListRelaxedConst
instead of IntrusiveList. It will be useful later on when we model
shared/exclusive locks with the help of const and mutable references.
This commit is contained in:
Jean-Baptiste Boric 2021-07-20 19:41:38 +02:00 committed by Andreas Kling
parent bb609cee7f
commit 786036820b
Notes: sideshowbarker 2024-07-18 07:21:07 +09:00 
Author: https://github.com/boricj
Commit: https://github.com/SerenityOS/serenity/commit/786036820b4
Pull-request: https://github.com/SerenityOS/serenity/pull/8851
Reviewed-by: https://github.com/awesomekling ✅
Reviewed-by: https://github.com/bgianfo
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AK/IntrusiveListRelaxedConst.h Normal file
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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/IntrusiveList.h>
namespace AK {
template<class T, typename Container, IntrusiveListNode<T, Container> T::*member>
class IntrusiveListRelaxedConst : public IntrusiveList<T, Container, member> {
AK_MAKE_NONCOPYABLE(IntrusiveListRelaxedConst);
AK_MAKE_NONMOVABLE(IntrusiveListRelaxedConst);
public:
using IntrusiveList<T, Container, member>::IntrusiveList;
using Iterator = IntrusiveList<T, Container, member>::Iterator;
Iterator begin() const { return const_cast<IntrusiveListRelaxedConst*>(this)->IntrusiveList<T, Container, member>::begin(); }
Iterator end() const { return Iterator {}; }
};
}
using AK::IntrusiveListRelaxedConst;