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util/Intrusive{List,HashSet}: add "tag" for base hooks

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This commit is contained in:
Max Kellermann
2023-10-13 18:00:28 +02:00
committed by Max Kellermann
parent 57d9cffc42
commit 10940da381
4 changed files with 135 additions and 7 deletions
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12
src/util/IntrusiveHashSet.hxx
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@@ -19,7 +19,11 @@ struct IntrusiveHashSetOptions {
bool zero_initialized = false;
};
template<IntrusiveHookMode mode=IntrusiveHookMode::NORMAL>
/**
* @param Tag an arbitrary tag type to allow using multiple base hooks
*/
template<IntrusiveHookMode mode=IntrusiveHookMode::NORMAL,
typename Tag=void>
struct IntrusiveHashSetHook {
using SiblingsHook = IntrusiveListHook<mode>;
@@ -36,12 +40,14 @@ struct IntrusiveHashSetHook {
/**
* For classes which embed #IntrusiveHashSetHook as base class.
*
* @param Tag selector for which #IntrusiveHashSetHook to use
*/
template<typename T>
template<typename T, typename Tag=void>
struct IntrusiveHashSetBaseHookTraits {
/* a never-called helper function which is used by _Cast() */
template<IntrusiveHookMode mode>
static constexpr IntrusiveHashSetHook<mode> _Identity(const IntrusiveHashSetHook<mode> &) noexcept;
static constexpr IntrusiveHashSetHook<mode, Tag> _Identity(const IntrusiveHashSetHook<mode, Tag> &) noexcept;
/* another never-called helper function which "calls"
_Identity(), implicitly casting the item to the

14
src/util/IntrusiveList.hxx
View File

@@ -35,9 +35,13 @@ struct IntrusiveListNode {
}
};
template<IntrusiveHookMode _mode=IntrusiveHookMode::NORMAL>
/**
* @param Tag an arbitrary tag type to allow using multiple base hooks
*/
template<IntrusiveHookMode _mode=IntrusiveHookMode::NORMAL,
typename Tag=void>
class IntrusiveListHook {
template<typename T> friend struct IntrusiveListBaseHookTraits;
template<typename, typename> friend struct IntrusiveListBaseHookTraits;
template<auto member> friend struct IntrusiveListMemberHookTraits;
template<typename T, typename HookTraits, IntrusiveListOptions> friend class IntrusiveList;
@@ -91,12 +95,14 @@ using AutoUnlinkIntrusiveListHook =
/**
* For classes which embed #IntrusiveListHook as base class.
*
* @param Tag selector for which #IntrusiveHashSetHook to use
*/
template<typename T>
template<typename T, typename Tag=void>
struct IntrusiveListBaseHookTraits {
/* a never-called helper function which is used by _Cast() */
template<IntrusiveHookMode mode>
static constexpr IntrusiveListHook<mode> _Identity(const IntrusiveListHook<mode> &) noexcept;
static constexpr IntrusiveListHook<mode, Tag> _Identity(const IntrusiveListHook<mode, Tag> &) noexcept;
/* another never-called helper function which "calls"
_Identity(), implicitly casting the item to the