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185 lines
4.4 KiB
C++
185 lines
4.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Format.h>
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#include <AK/RefCounted.h>
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#include <AK/StdLibExtras.h>
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#include <AK/Traits.h>
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#include <AK/Types.h>
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namespace AK {
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template<typename T, typename PtrTraits>
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class RefPtr;
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template<typename T>
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class NonnullRefPtr;
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template<typename T>
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class WeakPtr;
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template<typename T>
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class NonnullOwnPtr {
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public:
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using ElementType = T;
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enum AdoptTag { Adopt };
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NonnullOwnPtr(AdoptTag, T& ptr)
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: m_ptr(&ptr)
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{
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static_assert(
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requires { requires typename T::AllowOwnPtr()(); } || !requires(T obj) { requires !typename T::AllowOwnPtr()(); obj.ref(); obj.unref(); },
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"Use NonnullRefPtr<> for RefCounted types");
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}
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NonnullOwnPtr(NonnullOwnPtr&& other)
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: m_ptr(other.leak_ptr())
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{
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VERIFY(m_ptr);
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}
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template<typename U>
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NonnullOwnPtr(NonnullOwnPtr<U>&& other)
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: m_ptr(other.leak_ptr())
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{
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VERIFY(m_ptr);
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}
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~NonnullOwnPtr()
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{
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clear();
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#ifdef SANITIZE_PTRS
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if constexpr (sizeof(T*) == 8)
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m_ptr = (T*)(0xe3e3e3e3e3e3e3e3);
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else
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m_ptr = (T*)(0xe3e3e3e3);
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#endif
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}
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NonnullOwnPtr(const NonnullOwnPtr&) = delete;
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template<typename U>
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NonnullOwnPtr(const NonnullOwnPtr<U>&) = delete;
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NonnullOwnPtr& operator=(const NonnullOwnPtr&) = delete;
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template<typename U>
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NonnullOwnPtr& operator=(const NonnullOwnPtr<U>&) = delete;
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template<typename U, typename PtrTraits = RefPtrTraits<U>>
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NonnullOwnPtr(const RefPtr<U, PtrTraits>&) = delete;
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template<typename U>
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NonnullOwnPtr(const NonnullRefPtr<U>&) = delete;
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template<typename U>
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NonnullOwnPtr(const WeakPtr<U>&) = delete;
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template<typename U, typename PtrTraits = RefPtrTraits<U>>
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NonnullOwnPtr& operator=(const RefPtr<U, PtrTraits>&) = delete;
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template<typename U>
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NonnullOwnPtr& operator=(const NonnullRefPtr<U>&) = delete;
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template<typename U>
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NonnullOwnPtr& operator=(const WeakPtr<U>&) = delete;
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NonnullOwnPtr& operator=(NonnullOwnPtr&& other)
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{
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NonnullOwnPtr ptr(move(other));
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swap(ptr);
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return *this;
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}
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template<typename U>
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NonnullOwnPtr& operator=(NonnullOwnPtr<U>&& other)
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{
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NonnullOwnPtr ptr(move(other));
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swap(ptr);
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return *this;
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}
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[[nodiscard]] T* leak_ptr()
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{
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return exchange(m_ptr, nullptr);
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}
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T* ptr() { return m_ptr; }
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const T* ptr() const { return m_ptr; }
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T* operator->() { return m_ptr; }
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const T* operator->() const { return m_ptr; }
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T& operator*() { return *m_ptr; }
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const T& operator*() const { return *m_ptr; }
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operator const T*() const { return m_ptr; }
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operator T*() { return m_ptr; }
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operator bool() const = delete;
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bool operator!() const = delete;
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void swap(NonnullOwnPtr& other)
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{
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::swap(m_ptr, other.m_ptr);
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}
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template<typename U>
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void swap(NonnullOwnPtr<U>& other)
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{
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::swap(m_ptr, other.m_ptr);
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}
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template<typename U>
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NonnullOwnPtr<U> release_nonnull()
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{
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VERIFY(m_ptr);
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return NonnullOwnPtr<U>(NonnullOwnPtr<U>::Adopt, static_cast<U&>(*leak_ptr()));
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}
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private:
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void clear()
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{
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if (!m_ptr)
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return;
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delete m_ptr;
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m_ptr = nullptr;
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}
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T* m_ptr = nullptr;
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};
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template<typename T>
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inline NonnullOwnPtr<T> adopt_own(T& object)
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{
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return NonnullOwnPtr<T>(NonnullOwnPtr<T>::Adopt, object);
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}
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template<class T, class... Args>
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inline NonnullOwnPtr<T>
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make(Args&&... args)
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{
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return NonnullOwnPtr<T>(NonnullOwnPtr<T>::Adopt, *new T(forward<Args>(args)...));
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}
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template<typename T>
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struct Traits<NonnullOwnPtr<T>> : public GenericTraits<NonnullOwnPtr<T>> {
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using PeekType = const T*;
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static unsigned hash(const NonnullOwnPtr<T>& p) { return int_hash((u32)p.ptr()); }
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static bool equals(const NonnullOwnPtr<T>& a, const NonnullOwnPtr<T>& b) { return a.ptr() == b.ptr(); }
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};
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template<typename T, typename U>
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inline void swap(NonnullOwnPtr<T>& a, NonnullOwnPtr<U>& b)
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{
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a.swap(b);
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}
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template<typename T>
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struct Formatter<NonnullOwnPtr<T>> : Formatter<const T*> {
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void format(FormatBuilder& builder, const NonnullOwnPtr<T>& value)
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{
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Formatter<const T*>::format(builder, value.ptr());
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}
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};
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}
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using AK::adopt_own;
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using AK::make;
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using AK::NonnullOwnPtr;
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