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e50b9f5478
It is a non-null `T*` with reference semantics. Or a `T&` whose address can be copied and re-assigned. Or a `NonnullRefPtr` whose memory is not managed. It can be useful when you want to store a reference in a data structure that needs to be copyable or assignable.
87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
/*
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* Copyright (c) 2024, the Ladybird developers.
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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/Forward.h>
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#include <AK/Traits.h>
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namespace AK {
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template<typename T>
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requires(!IsLvalueReference<T> && !IsRvalueReference<T>) class [[nodiscard]] NonnullRawPtr {
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public:
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using ValueType = T;
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NonnullRawPtr() = delete;
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NonnullRawPtr(T& other)
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: m_ptr(&other)
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{
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}
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NonnullRawPtr(NonnullRawPtr const& other)
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: m_ptr(other.m_ptr)
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{
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}
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NonnullRawPtr(NonnullRawPtr&& other)
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: m_ptr(other.m_ptr)
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{
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}
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NonnullRawPtr& operator=(NonnullRawPtr const& other)
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{
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m_ptr = other.m_ptr;
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return *this;
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}
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NonnullRawPtr& operator=(NonnullRawPtr&& other)
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{
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m_ptr = other.m_ptr;
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return *this;
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}
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operator bool() const = delete;
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bool operator!() const = delete;
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operator T&() { return *m_ptr; }
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operator T const&() const { return *m_ptr; }
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[[nodiscard]] ALWAYS_INLINE T& value() { return *m_ptr; }
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[[nodiscard]] ALWAYS_INLINE T const& value() const { return *m_ptr; }
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[[nodiscard]] ALWAYS_INLINE T& operator*() { return value(); }
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[[nodiscard]] ALWAYS_INLINE T const& operator*() const { return value(); }
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ALWAYS_INLINE RETURNS_NONNULL T* operator->() { return &value(); }
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ALWAYS_INLINE RETURNS_NONNULL T const* operator->() const { return &value(); }
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private:
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T* m_ptr;
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};
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template<typename T>
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struct Traits<NonnullRawPtr<T>> : public DefaultTraits<NonnullRawPtr<T>> {
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static unsigned hash(NonnullRawPtr<T> const& handle) { return Traits<T>::hash(handle); }
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};
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namespace Detail {
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template<typename T>
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inline constexpr bool IsHashCompatible<NonnullRawPtr<T>, T> = true;
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template<typename T>
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inline constexpr bool IsHashCompatible<T, NonnullRawPtr<T>> = true;
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}
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}
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#if USING_AK_GLOBALLY
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using AK::NonnullRawPtr;
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#endif
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