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AK+Kernel: Make IntrusiveList capable of holding non-raw pointers

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This should allow creating intrusive lists that have smart pointers,
while remaining free (compared to the impl before this commit) when
holding raw pointers :^)
As a sidenote, this also adds a `RawPtr<T>` type, which is just
equivalent to `T*`.
Note that this does not actually use such functionality, but is only
expected to pave the way for #6369, to replace NonnullRefPtrVector<T>
with intrusive lists.

As it is with zero-cost things, this makes the interface a bit less nice
by requiring the type name of what an `IntrusiveListNode` holds (and
optionally its container, if not RawPtr), and also requiring the type of
the container (normally `RawPtr`) on the `IntrusiveList` instance.
This commit is contained in:
AnotherTest 2021-04-16 16:33:24 +04:30 • committed by Andreas Kling
parent fb814ee720
commit e4412f1f59
11 changed files with 143 additions and 80 deletions
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11
AK/StdLibExtras.h
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@ -49,6 +49,13 @@ constexpr T&& move(T& arg)
using std::move;
namespace AK::Detail {
template<typename T>
struct _RawPtr {
using Type = T*;
};
}
namespace AK {
template<typename T>
@ -122,6 +129,9 @@ constexpr T exchange(T& slot, U&& value)
return old_value;
}
template<typename T>
using RawPtr = typename Detail::_RawPtr<T>::Type;
}
using AK::array_size;
@ -132,4 +142,5 @@ using AK::exchange;
using AK::forward;
using AK::max;
using AK::min;
using AK::RawPtr;
using AK::swap;