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AK: Allow hash-compatible key types in Hash[Table|Map] lookup

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This will allow us to avoid some potentially expensive type conversion
during lookup, like form String to StringView, which would allocate
memory otherwise.
This commit is contained in:
Hendiadyoin1 2021-11-07 14:52:20 +01:00 • committed by Ali Mohammad Pur
parent c8bee92fb9
commit d50360f5dd
2 changed files with 79 additions and 0 deletions
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46
AK/HashMap.h
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@ -91,6 +91,19 @@ public:
return m_table.find(hash, predicate);
}
// FIXME: Use some sort of Traits to get the comparison operation
template<Concepts::HashCompatible<K> Key>
requires(IsSame<KeyTraits, Traits<K>>) [[nodiscard]] IteratorType find(Key const& value)
{
return m_table.find(Traits<Key>::hash(value), [&](auto& entry) { return value == entry.key; });
}
template<Concepts::HashCompatible<K> Key>
requires(IsSame<KeyTraits, Traits<K>>) [[nodiscard]] ConstIteratorType find(Key const& value) const
{
return m_table.find(Traits<Key>::hash(value), [&](auto& entry) { return value == entry.key; });
}
void ensure_capacity(size_t capacity) { m_table.ensure_capacity(capacity); }
ErrorOr<void> try_ensure_capacity(size_t capacity) { return m_table.try_ensure_capacity(capacity); }
@ -118,11 +131,44 @@ public:
return (*it).value;
}
template<Concepts::HashCompatible<K> Key>
requires(IsSame<KeyTraits, Traits<K>>) Optional<typename Traits<V>::PeekType> get(const Key& key) const requires(!IsPointer<typename Traits<V>::PeekType>)
{
auto it = find(key);
if (it == end())
return {};
return (*it).value;
}
template<Concepts::HashCompatible<K> Key>
requires(IsSame<KeyTraits, Traits<K>>) Optional<typename Traits<V>::ConstPeekType> get(const Key& key) const requires(IsPointer<typename Traits<V>::PeekType>)
{
auto it = find(key);
if (it == end())
return {};
return (*it).value;
}
template<Concepts::HashCompatible<K> Key>
requires(IsSame<KeyTraits, Traits<K>>) Optional<typename Traits<V>::PeekType> get(const Key& key) requires(!IsConst<typename Traits<V>::PeekType>)
{
auto it = find(key);
if (it == end())
return {};
return (*it).value;
}
[[nodiscard]] bool contains(const K& key) const
{
return find(key) != end();
}
template<Concepts::HashCompatible<K> Key>
requires(IsSame<KeyTraits, Traits<K>>) [[nodiscard]] bool contains(Key const& value)
{
return find(value) != end();
}
void remove(IteratorType it)
{
m_table.remove(it);