[llvm] 4aee4c9 - [ADT] add equality operator for SmallSet
Fedor Sergeev via llvm-commits
llvm-commits at lists.llvm.org
Tue Oct 29 17:36:14 PDT 2019
Author: Fedor Sergeev
Date: 2019-10-29T17:33:57-07:00
New Revision: 4aee4c99c543dba7d9d67029e40311eb629e30c3
URL: https://github.com/llvm/llvm-project/commit/4aee4c99c543dba7d9d67029e40311eb629e30c3
DIFF: https://github.com/llvm/llvm-project/commit/4aee4c99c543dba7d9d67029e40311eb629e30c3.diff
LOG: [ADT] add equality operator for SmallSet
Makes it easier to migrate existing code that uses std::set.
Reviewed By: fhahn
Differential Revision: https://reviews.llvm.org/D69417
Added:
Modified:
llvm/include/llvm/ADT/SmallSet.h
llvm/unittests/ADT/SmallSetTest.cpp
Removed:
################################################################################
diff --git a/llvm/include/llvm/ADT/SmallSet.h b/llvm/include/llvm/ADT/SmallSet.h
index 6b128c2e2992..a03fa7dd8423 100644
--- a/llvm/include/llvm/ADT/SmallSet.h
+++ b/llvm/include/llvm/ADT/SmallSet.h
@@ -248,6 +248,31 @@ class SmallSet {
template <typename PointeeType, unsigned N>
class SmallSet<PointeeType*, N> : public SmallPtrSet<PointeeType*, N> {};
+/// Equality comparison for SmallSet.
+///
+/// Iterates over elements of LHS confirming that each element is also a member
+/// of RHS, and that RHS contains no additional values.
+/// Equivalent to N calls to RHS.count.
+/// For small-set mode amortized complexity is O(N^2)
+/// For large-set mode amortized complexity is linear, worst case is O(N^2) (if
+/// every hash collides).
+template <typename T, unsigned LN, unsigned RN, typename C>
+bool operator==(const SmallSet<T, LN, C> &LHS, const SmallSet<T, RN, C> &RHS) {
+ if (LHS.size() != RHS.size())
+ return false;
+
+ // All elements in LHS must also be in RHS
+ return all_of(LHS, [&RHS](const T &E) { return RHS.count(E); });
+}
+
+/// Inequality comparison for SmallSet.
+///
+/// Equivalent to !(LHS == RHS). See operator== for performance notes.
+template <typename T, unsigned LN, unsigned RN, typename C>
+bool operator!=(const SmallSet<T, LN, C> &LHS, const SmallSet<T, RN, C> &RHS) {
+ return !(LHS == RHS);
+}
+
} // end namespace llvm
#endif // LLVM_ADT_SMALLSET_H
diff --git a/llvm/unittests/ADT/SmallSetTest.cpp b/llvm/unittests/ADT/SmallSetTest.cpp
index 8fb78b01f446..06682ce823dc 100644
--- a/llvm/unittests/ADT/SmallSetTest.cpp
+++ b/llvm/unittests/ADT/SmallSetTest.cpp
@@ -142,3 +142,28 @@ TEST(SmallSetTest, IteratorIncMoveCopy) {
Iter = std::move(Iter2);
EXPECT_EQ("str 0", *Iter);
}
+
+TEST(SmallSetTest, EqualityComparisonTest) {
+ SmallSet<int, 8> s1small;
+ SmallSet<int, 10> s2small;
+ SmallSet<int, 3> s3large;
+ SmallSet<int, 8> s4large;
+
+ for (int i = 1; i < 5; i++) {
+ s1small.insert(i);
+ s2small.insert(5 - i);
+ s3large.insert(i);
+ }
+ for (int i = 1; i < 11; i++)
+ s4large.insert(i);
+
+ EXPECT_EQ(s1small, s1small);
+ EXPECT_EQ(s3large, s3large);
+
+ EXPECT_EQ(s1small, s2small);
+ EXPECT_EQ(s1small, s3large);
+ EXPECT_EQ(s2small, s3large);
+
+ EXPECT_NE(s1small, s4large);
+ EXPECT_NE(s4large, s3large);
+}
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