[llvm] Add contains(KeyType) -> bool methods to SmallSet

Matches C++20 API addition. Differential Revision: https://reviews.llvm.org/D83449
llvm · Jul 17, 2020 · dd4426b · dd4426b
1 parent a0385bd
commit dd4426b
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diff --git a/llvm/include/llvm/ADT/SmallSet.h b/llvm/include/llvm/ADT/SmallSet.h
@@ -232,6 +232,13 @@ class SmallSet {
     return {Set.end()};
   }
 
+  /// Check if the SmallSet contains the given element.
+  bool contains(const T &V) const {
+    if (isSmall())
+      return vfind(V) != Vector.end();
+    return Set.find(V) != Set.end();
+  }
+
 private:
   bool isSmall() const { return Set.empty(); }
 

diff --git a/llvm/unittests/ADT/SmallSetTest.cpp b/llvm/unittests/ADT/SmallSetTest.cpp
@@ -167,3 +167,28 @@ TEST(SmallSetTest, EqualityComparisonTest) {
   EXPECT_NE(s1small, s4large);
   EXPECT_NE(s4large, s3large);
 }
+
+TEST(SmallSetTest, Contains) {
+  SmallSet<int, 2> Set;
+  EXPECT_FALSE(Set.contains(0));
+  EXPECT_FALSE(Set.contains(1));
+
+  Set.insert(0);
+  Set.insert(1);
+  EXPECT_TRUE(Set.contains(0));
+  EXPECT_TRUE(Set.contains(1));
+
+  Set.insert(1);
+  EXPECT_TRUE(Set.contains(0));
+  EXPECT_TRUE(Set.contains(1));
+
+  Set.erase(1);
+  EXPECT_TRUE(Set.contains(0));
+  EXPECT_FALSE(Set.contains(1));
+
+  Set.insert(1);
+  Set.insert(2);
+  EXPECT_TRUE(Set.contains(0));
+  EXPECT_TRUE(Set.contains(1));
+  EXPECT_TRUE(Set.contains(2));
+}