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AK+Tests: Add IntrusiveList<T,...>::insert_before(..) method

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The insert_before method on AK::InlineLinkedList is used, so in order to
achieve feature parity, we need to implement it for AK::IntrusiveList as
well.
This commit is contained in:
Brian Gianforcaro 2021-06-15 02:33:59 -07:00 committed by Andreas Kling
parent 4586668fc3
commit b7f8343f87
2 changed files with 49 additions and 0 deletions
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23
AK/IntrusiveList.h
View file

@ -54,6 +54,7 @@ public:
[[nodiscard]] size_t size_slow() const;
void append(T& n);
void prepend(T& n);
void insert_before(T&, T&);
void remove(T& n);
[[nodiscard]] bool contains(const T&) const;
[[nodiscard]] Container first() const;
@ -264,6 +265,28 @@ inline void IntrusiveList<T, Container, member>::prepend(T& n)
m_storage.m_last = &nnode;
}
template<class T, typename Container, IntrusiveListNode<T, Container> T::*member>
inline void IntrusiveList<T, Container, member>::insert_before(T& bn, T& n)
{
remove(n);
auto& new_node = n.*member;
auto& before_node = bn.*member;
new_node.m_storage = &m_storage;
new_node.m_next = &before_node;
new_node.m_prev = before_node.m_prev;
if (before_node.m_prev)
before_node.m_prev->m_next = &new_node;
before_node.m_prev = &new_node;
if (m_storage.m_first == &before_node) {
m_storage.m_first = &new_node;
}
if constexpr (!RemoveReference<decltype(new_node)>::IsRaw)
new_node.m_self.reference = &n;
}
template<class T, typename Container, IntrusiveListNode<T, Container> T::*member>
inline void IntrusiveList<T, Container, member>::remove(T& n)
{

26
Tests/AK/TestIntrusiveList.cpp
View file

@ -33,6 +33,32 @@ TEST_CASE(insert)
delete list.take_last();
}
TEST_CASE(insert_before)
{
IntrusiveTestList list;
auto two = new IntrusiveTestItem();
list.append(*two);
auto zero = new IntrusiveTestItem();
list.append(*zero);
auto one = new IntrusiveTestItem();
list.insert_before(*zero, *one);
EXPECT_EQ(list.first(), two);
EXPECT_EQ(list.last(), zero);
EXPECT(list.contains(*zero));
EXPECT(list.contains(*one));
EXPECT(list.contains(*two));
EXPECT(zero->m_list_node.is_in_list());
EXPECT(one->m_list_node.is_in_list());
EXPECT(two->m_list_node.is_in_list());
EXPECT_EQ(list.size_slow(), 3u);
while (auto elem = list.take_first()) {
delete elem;
}
}
TEST_CASE(enumeration)
{
constexpr size_t expected_size = 10;