69a8b95491
* FixedWidthPointer:
- operators ==/!=: Change second operand type from void* to const
Type*. Also add non-const version to resolve ambiguity warning when
comparing with non-const pointer.
- Add Pointer() getter.
- Remove templatized cast operators. They are nice for casting the
pointer directly to another pointer type, but result in ambiguity.
* Make preloaded_image::debug_string_table non-const. Avoids clashes of
the const and non-coast FixedWidthPointer comparison operators. A
cleaner (but more verbose) solution would be to spezialize
FixedWidthPointer for const types.
157 lines
2.4 KiB
C++
157 lines
2.4 KiB
C++
/*
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* Copyright 2012, Alex Smith, alex@alex-smith.me.uk.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef KERNEL_UTIL_FIXED_WIDTH_POINTER_H
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#define KERNEL_UTIL_FIXED_WIDTH_POINTER_H
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#include <SupportDefs.h>
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/*!
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\class FixedWidthPointer
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\brief Pointer class with fixed size (64-bit) storage.
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This class is a pointer-like class that uses a fixed size 64-bit storage.
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This is used to make kernel_args compatible (i.e. the same size) for both
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32-bit and 64-bit kernels.
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*/
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template<typename Type>
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class FixedWidthPointer {
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public:
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Type * Pointer() const
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{
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return (Type*)(addr_t)fValue;
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}
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operator Type*() const
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{
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return Pointer();
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}
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Type& operator*() const
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{
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return *Pointer();
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}
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Type* operator->() const
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{
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return Pointer();
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}
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Type& operator[](size_t i) const
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{
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return Pointer()[i];
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}
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FixedWidthPointer& operator=(const FixedWidthPointer& p)
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{
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fValue = p.fValue;
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return *this;
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}
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FixedWidthPointer& operator=(Type* p)
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{
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fValue = (addr_t)p;
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return *this;
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}
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/*!
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Get the 64-bit pointer value.
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\return Pointer address.
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*/
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uint64 Get() const
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{
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return fValue;
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}
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/*!
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Set the 64-bit pointer value.
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\param addr New address for the pointer.
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*/
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void SetTo(uint64 addr)
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{
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fValue = addr;
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}
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private:
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uint64 fValue;
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} _PACKED;
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// Specialization for void pointers, can be converted to another pointer type.
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template<>
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class FixedWidthPointer<void> {
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public:
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void * Pointer() const
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{
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return (void*)(addr_t)fValue;
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}
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operator void*() const
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{
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return Pointer();
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}
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FixedWidthPointer& operator=(const FixedWidthPointer& p)
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{
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fValue = p.fValue;
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return *this;
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}
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FixedWidthPointer& operator=(void* p)
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{
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fValue = (addr_t)p;
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return *this;
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}
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uint64 Get() const
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{
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return fValue;
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}
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void SetTo(uint64 addr)
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{
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fValue = addr;
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}
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private:
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uint64 fValue;
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} _PACKED;
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template<typename Type>
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inline bool
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operator==(const FixedWidthPointer<Type>& a, const Type* b)
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{
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return a.Get() == (addr_t)b;
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}
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template<typename Type>
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inline bool
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operator!=(const FixedWidthPointer<Type>& a, const Type* b)
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{
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return a.Get() != (addr_t)b;
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}
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template<typename Type>
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inline bool
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operator==(const FixedWidthPointer<Type>& a, Type* b)
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{
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return a.Get() == (addr_t)b;
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}
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template<typename Type>
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inline bool
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operator!=(const FixedWidthPointer<Type>& a, Type* b)
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{
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return a.Get() != (addr_t)b;
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}
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#endif /* KERNEL_UTIL_FIXED_WIDTH_POINTER_H */
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