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AK: Add OwnPtrWithCustomDeleter

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This class is a smart pointer that let you provide a custom deleter to
free the pointer.

It is quite primitive compared to other smart pointers but can still be
useful when interacting with C types that provides a custom `free()`
function.
This commit is contained in:
Lucas CHOLLET 2022-12-09 16:24:16 +01:00 committed by Linus Groh
parent 6640cb57b3
commit 34c13eff11
Notes: sideshowbarker 2024-07-17 03:08:42 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/34c13eff11
Pull-request: https://github.com/SerenityOS/serenity/pull/16383
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/MacDue
Reviewed-by: https://github.com/linusg ✅
Reviewed-by: https://github.com/trflynn89 ✅
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AK/OwnPtrWithCustomDeleter.h Normal file
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/*
* Copyright (c) 2022, Lucas Chollet <lucas.chollet@free.fr>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Function.h>
#include <AK/Noncopyable.h>
#include <AK/StdLibExtras.h>
template<typename T>
struct OwnPtrWithCustomDeleter {
AK_MAKE_NONCOPYABLE(OwnPtrWithCustomDeleter);
public:
OwnPtrWithCustomDeleter(T* ptr, Function<void(T*)> deleter)
: m_ptr(ptr)
, m_deleter(move(deleter))
{
}
OwnPtrWithCustomDeleter(OwnPtrWithCustomDeleter&& other)
{
swap(m_ptr, other.m_ptr);
swap(m_deleter, other.m_deleter);
};
~OwnPtrWithCustomDeleter()
{
if (m_ptr) {
VERIFY(m_deleter);
m_deleter(m_ptr);
}
}
private:
T* m_ptr { nullptr };
Function<void(T*)> m_deleter {};
};