[llvm] 3e4f343 - [ADT] Add DenseSetImpl(begin, end)

[Fangrui Song via llvm-commits]

Author: Fangrui Song
Date: 2020-05-01T10:10:45-07:00
New Revision: 3e4f343d4baed72a7596809be6cc7c0782f9604e

URL: https://github.com/llvm/llvm-project/commit/3e4f343d4baed72a7596809be6cc7c0782f9604e
DIFF: https://github.com/llvm/llvm-project/commit/3e4f343d4baed72a7596809be6cc7c0782f9604e.diff

LOG: [ADT] Add DenseSetImpl(begin, end)

Added: 
    

Modified: 
    llvm/include/llvm/ADT/DenseSet.h
    llvm/unittests/ADT/DenseSetTest.cpp

Removed: 
    


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diff  --git a/llvm/include/llvm/ADT/DenseSet.h b/llvm/include/llvm/ADT/DenseSet.h
index 9afb715ae1db..07edc3d8e4ec 100644
--- a/llvm/include/llvm/ADT/DenseSet.h
+++ b/llvm/include/llvm/ADT/DenseSet.h
@@ -66,6 +66,12 @@ class DenseSetImpl {
 
   explicit DenseSetImpl(unsigned InitialReserve = 0) : TheMap(InitialReserve) {}
 
+  template <typename InputIt>
+  DenseSetImpl(const InputIt &I, const InputIt &E)
+      : DenseSetImpl(PowerOf2Ceil(std::distance(I, E))) {
+    insert(I, E);
+  }
+
   DenseSetImpl(std::initializer_list<ValueT> Elems)
       : DenseSetImpl(PowerOf2Ceil(Elems.size())) {
     insert(Elems.begin(), Elems.end());

diff  --git a/llvm/unittests/ADT/DenseSetTest.cpp b/llvm/unittests/ADT/DenseSetTest.cpp
index b080aa7f0c65..556bd46537db 100644
--- a/llvm/unittests/ADT/DenseSetTest.cpp
+++ b/llvm/unittests/ADT/DenseSetTest.cpp
@@ -70,6 +70,15 @@ typedef ::testing::Types<DenseSet<unsigned, TestDenseSetInfo>,
     DenseSetTestTypes;
 TYPED_TEST_CASE(DenseSetTest, DenseSetTestTypes);
 
+TYPED_TEST(DenseSetTest, Constructor) {
+  constexpr unsigned a[] = {1, 2, 4};
+  TypeParam set(std::begin(a), std::end(a));
+  EXPECT_EQ(3u, set.size());
+  EXPECT_EQ(1u, set.count(1));
+  EXPECT_EQ(1u, set.count(2));
+  EXPECT_EQ(1u, set.count(4));
+}
+
 TYPED_TEST(DenseSetTest, InitializerList) {
   TypeParam set({1, 2, 1, 4});
   EXPECT_EQ(3u, set.size());