Add a copy constructor to StringMap

There is code under review that requires StringMap to have a copy constructor,
and this makes StringMap more consistent with our other containers (like
DenseMap) that have copy constructors.

Differential Revision: http://reviews.llvm.org/D18506

llvm-svn: 264906

1 files changed, 27 insertions, 0 deletions

diff --git a/llvm/unittests/ADT/StringMapTest.cpp b/llvm/unittests/ADT/StringMapTest.cpp
index 562126e..a85cae1 100644
--- a/llvm/unittests/ADT/StringMapTest.cpp
+++ b/llvm/unittests/ADT/StringMapTest.cpp
@@ -157,6 +157,33 @@ TEST_F(StringMapTest, SmallFullMapTest) {
   EXPECT_EQ(5, Map.lookup("funf"));
 }
 
+TEST_F(StringMapTest, CopyCtorTest) {
+  llvm::StringMap<int> Map;
+
+  Map["eins"] = 1;
+  Map["zwei"] = 2;
+  Map["drei"] = 3;
+  Map.erase("drei");
+  Map.erase("eins");
+  Map["veir"] = 4;
+  Map["funf"] = 5;
+
+  EXPECT_EQ(3u, Map.size());
+  EXPECT_EQ(0, Map.lookup("eins"));
+  EXPECT_EQ(2, Map.lookup("zwei"));
+  EXPECT_EQ(0, Map.lookup("drei"));
+  EXPECT_EQ(4, Map.lookup("veir"));
+  EXPECT_EQ(5, Map.lookup("funf"));
+
+  llvm::StringMap<int> Map2(Map);
+  EXPECT_EQ(3u, Map2.size());
+  EXPECT_EQ(0, Map2.lookup("eins"));
+  EXPECT_EQ(2, Map2.lookup("zwei"));
+  EXPECT_EQ(0, Map2.lookup("drei"));
+  EXPECT_EQ(4, Map2.lookup("veir"));
+  EXPECT_EQ(5, Map2.lookup("funf"));
+}
+
 // A more complex iteration test.
 TEST_F(StringMapTest, IterationTest) {
   bool visited[100];