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AK: Add hash traits for floating-point primitives

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This allows us to use float and double as hash keys.
This commit is contained in:
Andreas Kling 2022-04-10 12:27:08 +02:00
parent 69ca27d3d7
commit ae6b09f4dc
Notes: sideshowbarker 2024-07-17 14:11:45 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/ae6b09f4dc
2 changed files with 38 additions and 0 deletions
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14
AK/Traits.h
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@ -40,6 +40,20 @@ requires(IsIntegral<T>) struct Traits<T> : public GenericTraits<T> {
}
};
#ifndef KERNEL
template<typename T>
requires(IsFloatingPoint<T>) struct Traits<T> : public GenericTraits<T> {
static constexpr bool is_trivial() { return true; }
static constexpr unsigned hash(T value)
{
if constexpr (sizeof(T) < 8)
return int_hash(bit_cast<u32>(value));
else
return u64_hash(bit_cast<u64>(value));
}
};
#endif
template<typename T>
requires(IsPointer<T> && !Detail::IsPointerOfType<char, T>) struct Traits<T> : public GenericTraits<T> {
static unsigned hash(T p) { return ptr_hash((FlatPtr)p); }

24
Tests/AK/TestHashTable.cpp
View file

@ -256,6 +256,30 @@ TEST_CASE(non_trivial_type_table)
EXPECT_EQ(table.remove_all_matching([&](auto&) { return true; }), false);
}
TEST_CASE(floats)
{
HashTable<float> table;
table.set(0);
table.set(1.0f);
table.set(2.0f);
EXPECT_EQ(table.size(), 3u);
EXPECT(table.contains(0));
EXPECT(table.contains(1.0f));
EXPECT(table.contains(2.0f));
}
TEST_CASE(doubles)
{
HashTable<double> table;
table.set(0);
table.set(1.0);
table.set(2.0);
EXPECT_EQ(table.size(), 3u);
EXPECT(table.contains(0));
EXPECT(table.contains(1.0));
EXPECT(table.contains(2.0));
}
// Inserting and removing a bunch of elements will "thrash" the table, leading to a lot of "deleted" markers.
BENCHMARK_CASE(benchmark_thrashing)
{