tint/utils: Add Hashmap::Keys(), Hashmap::Values()
Change-Id: If51cb3f42e50db842ecd006bcfbbbd060957e650
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/112281
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Kokoro: Ben Clayton <bclayton@google.com>
diff --git a/src/tint/utils/hashmap.h b/src/tint/utils/hashmap.h
index 19a5abe..a37eab9 100644
--- a/src/tint/utils/hashmap.h
+++ b/src/tint/utils/hashmap.h
@@ -182,6 +182,30 @@
/// @returns a reference to the entry that is equal to the given value.
ConstReference Find(const Key& key) const { return ConstReference(*this, key); }
+ /// @returns the keys of the map as a vector.
+ /// @note the order of the returned vector is non-deterministic between compilers.
+ template <size_t N2 = N>
+ Vector<Key, N2> Keys() const {
+ Vector<Key, N2> out;
+ out.Reserve(this->Count());
+ for (auto it : *this) {
+ out.Push(it.key);
+ }
+ return out;
+ }
+
+ /// @returns the values of the map as a vector
+ /// @note the order of the returned vector is non-deterministic between compilers.
+ template <size_t N2 = N>
+ Vector<Value, N2> Values() const {
+ Vector<Value, N2> out;
+ out.Reserve(this->Count());
+ for (auto it : *this) {
+ out.Push(it.value);
+ }
+ return out;
+ }
+
private:
Value* Lookup(const Key& key) {
if (auto [found, index] = this->IndexOf(key); found) {
diff --git a/src/tint/utils/hashmap_test.cc b/src/tint/utils/hashmap_test.cc
index 6226967..3991eb2 100644
--- a/src/tint/utils/hashmap_test.cc
+++ b/src/tint/utils/hashmap_test.cc
@@ -182,6 +182,17 @@
Entry{3, "three!"}, Entry{4, "four!"}));
}
+TEST(Hashmap, KeysValues) {
+ using Map = Hashmap<int, std::string, 8>;
+ Map map;
+ map.Add(1, "one");
+ map.Add(4, "four");
+ map.Add(3, "three");
+ map.Add(2, "two");
+ EXPECT_THAT(map.Keys(), testing::UnorderedElementsAre(1, 2, 3, 4));
+ EXPECT_THAT(map.Values(), testing::UnorderedElementsAre("one", "two", "three", "four"));
+}
+
TEST(Hashmap, AddMany) {
Hashmap<int, std::string, 8> map;
for (size_t i = 0; i < kPrimes.size(); i++) {
