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985adcca38
The latest GCC and Clang versions both support this, so we can freely use these in our code.
72 lines
1.5 KiB
C++
72 lines
1.5 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/StdLibExtras.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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concept PointerTypeName = IsPointer<T>;
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template<PointerTypeName T>
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class Userspace {
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public:
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Userspace() = default;
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operator bool() const { return m_ptr; }
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operator FlatPtr() const { return (FlatPtr)m_ptr; }
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// Disable default implementations that would use surprising integer promotion.
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bool operator==(const Userspace&) const = delete;
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bool operator<=(const Userspace&) const = delete;
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bool operator>=(const Userspace&) const = delete;
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bool operator<(const Userspace&) const = delete;
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bool operator>(const Userspace&) const = delete;
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#ifdef KERNEL
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Userspace(FlatPtr ptr)
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: m_ptr(ptr)
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{
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}
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FlatPtr ptr() const { return m_ptr; }
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T unsafe_userspace_ptr() const { return (T)m_ptr; }
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#else
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Userspace(T ptr)
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: m_ptr(ptr)
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{
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}
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T ptr() const { return m_ptr; }
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#endif
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private:
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#ifdef KERNEL
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FlatPtr m_ptr { 0 };
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#else
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T m_ptr { nullptr };
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#endif
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};
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template<typename T, typename U>
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inline Userspace<T> static_ptr_cast(const Userspace<U>& ptr)
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{
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#ifdef KERNEL
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auto casted_ptr = static_cast<T>(ptr.unsafe_userspace_ptr());
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#else
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auto casted_ptr = static_cast<T>(ptr.ptr());
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#endif
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return Userspace<T>((FlatPtr)casted_ptr);
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}
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}
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using AK::static_ptr_cast;
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using AK::Userspace;
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