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With this change, ".*make.*" function family now does error checking earlier, which improves experience while using clangd. Note that the change also make them instantiate classes a bit more eagerly, so in LibVideo/PlaybackManager, we have to first define SeekingStateHandler and only then make() it. Co-Authored-By: stelar7 <dudedbz@gmail.com>
308 lines
7.2 KiB
C++
308 lines
7.2 KiB
C++
/*
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* Copyright (c) 2018-2023, 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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#define NONNULLREFPTR_SCRUB_BYTE 0xe1
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#include <AK/Assertions.h>
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#include <AK/Format.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>
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class RefPtr;
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template<typename T>
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ALWAYS_INLINE void ref_if_not_null(T* ptr)
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{
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if (ptr)
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ptr->ref();
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}
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template<typename T>
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ALWAYS_INLINE void unref_if_not_null(T* ptr)
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{
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if (ptr)
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ptr->unref();
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}
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template<typename T>
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class [[nodiscard]] NonnullRefPtr {
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template<typename U>
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friend class RefPtr;
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template<typename U>
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friend class NonnullRefPtr;
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template<typename U>
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friend class WeakPtr;
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public:
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using ElementType = T;
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enum AdoptTag { Adopt };
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ALWAYS_INLINE NonnullRefPtr(T const& object)
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: m_ptr(const_cast<T*>(&object))
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{
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m_ptr->ref();
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}
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template<typename U>
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requires(IsConvertible<U*, T*>)
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ALWAYS_INLINE NonnullRefPtr(U const& object)
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: m_ptr(const_cast<T*>(static_cast<T const*>(&object)))
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{
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m_ptr->ref();
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}
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ALWAYS_INLINE NonnullRefPtr(AdoptTag, T& object)
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: m_ptr(&object)
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{
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}
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ALWAYS_INLINE NonnullRefPtr(NonnullRefPtr&& other)
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: m_ptr(&other.leak_ref())
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{
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}
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template<typename U>
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requires(IsConvertible<U*, T*>)
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ALWAYS_INLINE NonnullRefPtr(NonnullRefPtr<U>&& other)
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: m_ptr(static_cast<T*>(&other.leak_ref()))
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{
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}
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ALWAYS_INLINE NonnullRefPtr(NonnullRefPtr const& other)
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: m_ptr(const_cast<T*>(other.ptr()))
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{
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m_ptr->ref();
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}
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template<typename U>
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requires(IsConvertible<U*, T*>)
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ALWAYS_INLINE NonnullRefPtr(NonnullRefPtr<U> const& other)
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: m_ptr(const_cast<T*>(static_cast<T const*>(other.ptr())))
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{
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m_ptr->ref();
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}
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ALWAYS_INLINE ~NonnullRefPtr()
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{
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auto* ptr = exchange(m_ptr, nullptr);
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unref_if_not_null(ptr);
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#ifdef SANITIZE_PTRS
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m_ptr = reinterpret_cast<T*>(explode_byte(NONNULLREFPTR_SCRUB_BYTE));
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#endif
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}
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template<typename U>
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NonnullRefPtr(OwnPtr<U> const&) = delete;
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template<typename U>
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NonnullRefPtr& operator=(OwnPtr<U> const&) = delete;
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template<typename U>
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NonnullRefPtr(RefPtr<U> const&) = delete;
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template<typename U>
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NonnullRefPtr& operator=(RefPtr<U> const&) = delete;
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NonnullRefPtr(RefPtr<T> const&) = delete;
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NonnullRefPtr& operator=(RefPtr<T> const&) = delete;
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NonnullRefPtr& operator=(NonnullRefPtr const& other)
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{
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NonnullRefPtr tmp { other };
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swap(tmp);
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return *this;
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}
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template<typename U>
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requires(IsConvertible<U*, T*>)
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NonnullRefPtr& operator=(NonnullRefPtr<U> const& other)
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{
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NonnullRefPtr tmp { other };
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swap(tmp);
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return *this;
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}
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ALWAYS_INLINE NonnullRefPtr& operator=(NonnullRefPtr&& other)
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{
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NonnullRefPtr tmp { move(other) };
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swap(tmp);
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return *this;
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}
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template<typename U>
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requires(IsConvertible<U*, T*>)
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NonnullRefPtr& operator=(NonnullRefPtr<U>&& other)
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{
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NonnullRefPtr tmp { move(other) };
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swap(tmp);
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return *this;
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}
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NonnullRefPtr& operator=(T const& object)
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{
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NonnullRefPtr tmp { object };
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swap(tmp);
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return *this;
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}
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[[nodiscard]] ALWAYS_INLINE T& leak_ref()
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{
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T* ptr = exchange(m_ptr, nullptr);
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VERIFY(ptr);
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return *ptr;
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}
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ALWAYS_INLINE RETURNS_NONNULL T* ptr() const
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{
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return as_nonnull_ptr();
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}
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ALWAYS_INLINE RETURNS_NONNULL T* operator->() const
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{
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return as_nonnull_ptr();
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}
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ALWAYS_INLINE T& operator*() const
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{
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return *as_nonnull_ptr();
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}
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ALWAYS_INLINE RETURNS_NONNULL operator T*() const
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{
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return as_nonnull_ptr();
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}
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ALWAYS_INLINE operator T&() const
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{
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return *as_nonnull_ptr();
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}
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operator bool() const = delete;
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bool operator!() const = delete;
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void swap(NonnullRefPtr& other)
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{
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AK::swap(m_ptr, other.m_ptr);
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}
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template<typename U>
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void swap(NonnullRefPtr<U>& other)
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requires(IsConvertible<U*, T*>)
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{
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AK::swap(m_ptr, other.m_ptr);
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}
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bool operator==(NonnullRefPtr const& other) const { return m_ptr == other.m_ptr; }
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template<typename RawPtr>
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requires(IsPointer<RawPtr>)
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bool operator==(RawPtr other) const
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{
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return m_ptr == other;
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}
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private:
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NonnullRefPtr() = delete;
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ALWAYS_INLINE RETURNS_NONNULL T* as_nonnull_ptr() const
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{
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VERIFY(m_ptr);
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return m_ptr;
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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 NonnullRefPtr<T> adopt_ref(T& object)
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{
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return NonnullRefPtr<T>(NonnullRefPtr<T>::Adopt, object);
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}
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// Use like `adopt_nonnull_ref_or_enomem(new (nothrow) T(args...))`.
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template<typename T>
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inline ErrorOr<NonnullRefPtr<T>> adopt_nonnull_ref_or_enomem(T* object)
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{
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if (!object)
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return Error::from_errno(ENOMEM);
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return NonnullRefPtr<T>(NonnullRefPtr<T>::Adopt, *object);
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}
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template<typename T, class... Args>
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requires(IsConstructible<T, Args...>) inline ErrorOr<NonnullRefPtr<T>> try_make_ref_counted(Args&&... args)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) T(forward<Args>(args)...));
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}
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#ifdef AK_COMPILER_APPLE_CLANG
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// FIXME: Remove once P0960R3 is available in Apple Clang.
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template<typename T, class... Args>
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inline ErrorOr<NonnullRefPtr<T>> try_make_ref_counted(Args&&... args)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) T { forward<Args>(args)... });
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}
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#endif
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template<Formattable T>
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struct Formatter<NonnullRefPtr<T>> : Formatter<T> {
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ErrorOr<void> format(FormatBuilder& builder, NonnullRefPtr<T> const& value)
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{
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return Formatter<T>::format(builder, *value);
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}
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};
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template<typename T>
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requires(!HasFormatter<T>)
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struct Formatter<NonnullRefPtr<T>> : Formatter<T const*> {
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ErrorOr<void> format(FormatBuilder& builder, NonnullRefPtr<T> const& value)
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{
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return Formatter<T const*>::format(builder, value.ptr());
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}
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};
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template<typename T, typename U>
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requires(IsConvertible<U*, T*>)
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inline void swap(NonnullRefPtr<T>& a, NonnullRefPtr<U>& b)
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{
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a.swap(b);
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}
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template<typename T, class... Args>
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requires(IsConstructible<T, Args...>) inline NonnullRefPtr<T> make_ref_counted(Args&&... args)
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{
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return NonnullRefPtr<T>(NonnullRefPtr<T>::Adopt, *new T(forward<Args>(args)...));
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}
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#ifdef AK_COMPILER_APPLE_CLANG
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// FIXME: Remove once P0960R3 is available in Apple Clang.
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template<typename T, class... Args>
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inline NonnullRefPtr<T> make_ref_counted(Args&&... args)
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{
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return NonnullRefPtr<T>(NonnullRefPtr<T>::Adopt, *new T { forward<Args>(args)... });
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}
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#endif
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template<typename T>
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struct Traits<NonnullRefPtr<T>> : public DefaultTraits<NonnullRefPtr<T>> {
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using PeekType = T*;
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using ConstPeekType = T const*;
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static unsigned hash(NonnullRefPtr<T> const& p) { return ptr_hash(p.ptr()); }
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static bool equals(NonnullRefPtr<T> const& a, NonnullRefPtr<T> const& b) { return a.ptr() == b.ptr(); }
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};
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}
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#if USING_AK_GLOBALLY
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using AK::adopt_nonnull_ref_or_enomem;
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using AK::adopt_ref;
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using AK::make_ref_counted;
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using AK::NonnullRefPtr;
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using AK::try_make_ref_counted;
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#endif
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