178 lines
10 KiB
C
178 lines
10 KiB
C
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#ifndef __ADDR_PRI_H__
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#define __ADDR_PRI_H__
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#include <utility>
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#include <type_traits>
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//base on C++11
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/**********************************************************
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access private function
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**********************************************************/
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namespace std {
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template <bool B, class T = void>
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using enable_if_t = typename enable_if<B, T>::type;
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template <class T>
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using remove_reference_t = typename remove_reference<T>::type;
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} // std
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// Unnamed namespace is used to avoid duplicate symbols if the macros are used
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namespace {
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namespace private_access_detail {
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// @tparam TagType, used to declare different "get" funciton overloads for
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// different members/statics
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template <typename PtrType, PtrType PtrValue, typename TagType>
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struct private_access {
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// Normal lookup cannot find in-class defined (inline) friend functions.
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friend PtrType get(TagType) { return PtrValue; }
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};
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} // namespace private_access_detail
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} // namespace
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// Used macro naming conventions:
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// The "namespace" of this macro library is PRIVATE_ACCESS, i.e. all
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// macro here has this prefix.
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// All implementation macro, which are not meant to be used directly have the
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// PRIVATE_ACCESS_DETAIL prefix.
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// Some macros have the ABCD_IMPL form, which means they contain the
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// implementation details for the specific ABCD macro.
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#define PRIVATE_ACCESS_DETAIL_CONCATENATE_IMPL(x, y) x##y
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#define PRIVATE_ACCESS_DETAIL_CONCATENATE(x, y) \
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PRIVATE_ACCESS_DETAIL_CONCATENATE_IMPL(x, y)
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// @param PtrTypeKind E.g if we have "class A", then it can be "A::*" in case of
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// members, or it can be "*" in case of statics.
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#define PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE(Tag, Class, Type, Name, \
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PtrTypeKind) \
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namespace { \
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namespace private_access_detail { \
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/* Tag type, used to declare different get funcitons for different \
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* members \
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*/ \
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struct Tag {}; \
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/* Explicit instantiation */ \
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template struct private_access<decltype(&Class::Name), &Class::Name, \
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Tag>; \
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/* We can build the PtrType only with two aliases */ \
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/* E.g. using PtrType = int(int) *; would be illformed */ \
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using PRIVATE_ACCESS_DETAIL_CONCATENATE(Alias_, Tag) = Type; \
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using PRIVATE_ACCESS_DETAIL_CONCATENATE(PtrType_, Tag) = \
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PRIVATE_ACCESS_DETAIL_CONCATENATE(Alias_, Tag) PtrTypeKind; \
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/* Declare the friend function, now it is visible in namespace scope. \
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* Note, \
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* we could declare it inside the Tag type too, in that case ADL would \
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* find \
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* the declaration. By choosing to declare it here, the Tag type remains \
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* a \
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* simple tag type, it has no other responsibilities. */ \
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PRIVATE_ACCESS_DETAIL_CONCATENATE(PtrType_, Tag) get(Tag); \
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} \
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}
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#define PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE_FIELD(Tag, Class, Type, Name) \
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PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE(Tag, Class, Type, Name, Class::*) \
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namespace { \
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namespace access_private_field { \
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Type &Class##Name(Class &&t) { return t.*get(private_access_detail::Tag{}); } \
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Type &Class##Name(Class &t) { return t.*get(private_access_detail::Tag{}); } \
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/* The following usings are here to avoid duplicate const qualifier \
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* warnings \
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*/ \
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using PRIVATE_ACCESS_DETAIL_CONCATENATE(X, Tag) = Type; \
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using PRIVATE_ACCESS_DETAIL_CONCATENATE(Y, Tag) = \
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const PRIVATE_ACCESS_DETAIL_CONCATENATE(X, Tag); \
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PRIVATE_ACCESS_DETAIL_CONCATENATE(Y, Tag) & Class##Name(const Class &t) {\
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return t.*get(private_access_detail::Tag{}); \
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} \
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} \
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}
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#define PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE_FUN(Tag, Class, Type, Name) \
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PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE(Tag, Class, Type, Name, Class::*) \
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namespace { \
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namespace call_private_fun { \
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/* We do perfect forwarding, but we want to restrict the overload set \
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* only for objects which have the type Class. */ \
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template <typename Obj, \
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std::enable_if_t<std::is_same<std::remove_reference_t<Obj>, \
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Class>::value> * = nullptr, \
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typename... Args> \
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auto Class##Name(Obj &&o, Args &&... args) -> decltype( \
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(std::forward<Obj>(o).* \
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get(private_access_detail::Tag{}))(std::forward<Args>(args)...)) { \
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return (std::forward<Obj>(o).*get(private_access_detail::Tag{}))( \
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std::forward<Args>(args)...); \
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} \
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} \
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namespace get_private_fun { \
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auto Class##Name() -> decltype( \
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get(private_access_detail::Tag{})) { \
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return (get(private_access_detail::Tag{})); \
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} \
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} \
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}
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#define PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE_STATIC_FIELD(Tag, Class, Type, \
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Name) \
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PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE(Tag, Class, Type, Name, *) \
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namespace { \
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namespace access_private_static_field { \
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namespace Class { \
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Type &Class##Name() { return *get(private_access_detail::Tag{}); } \
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} \
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} \
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}
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#define PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE_STATIC_FUN(Tag, Class, Type, \
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Name) \
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PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE(Tag, Class, Type, Name, *) \
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namespace { \
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namespace call_private_static_fun { \
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namespace Class { \
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template <typename... Args> \
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auto Class##Name(Args &&... args) -> decltype( \
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get(private_access_detail::Tag{})(std::forward<Args>(args)...)) { \
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return get(private_access_detail::Tag{})( \
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std::forward<Args>(args)...); \
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} \
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} \
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} \
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namespace get_private_static_fun { \
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namespace Class { \
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auto Class##Name() -> decltype(get(private_access_detail::Tag{})) { \
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return get(private_access_detail::Tag{}); \
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} \
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} \
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} \
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}
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#define PRIVATE_ACCESS_DETAIL_UNIQUE_TAG \
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PRIVATE_ACCESS_DETAIL_CONCATENATE(PrivateAccessTag, __COUNTER__)
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#define ACCESS_PRIVATE_FIELD(Class, Type, Name) \
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PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE_FIELD(PRIVATE_ACCESS_DETAIL_UNIQUE_TAG, \
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Class, Type, Name)
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#define ACCESS_PRIVATE_FUN(Class, Type, Name) \
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PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE_FUN(PRIVATE_ACCESS_DETAIL_UNIQUE_TAG, \
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Class, Type, Name)
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#define ACCESS_PRIVATE_STATIC_FIELD(Class, Type, Name) \
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Type Class::Name; \
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PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE_STATIC_FIELD( \
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PRIVATE_ACCESS_DETAIL_UNIQUE_TAG, Class, Type, Name)
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#define ACCESS_PRIVATE_STATIC_FUN(Class, Type, Name) \
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PRIVATE_ACCESS_DETAIL_ACCESS_PRIVATE_STATIC_FUN( \
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PRIVATE_ACCESS_DETAIL_UNIQUE_TAG, Class, Type, Name)
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#endif
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