Fix a bug in the move-assigment operator for basic_stringbuf. Thanks to Johnathan Wakeley for the bug report

llvm-svn: 217894

1 files changed, 36 insertions, 0 deletions

diff --git a/libcxx/test/input.output/string.streams/istringstream/istringstream.assign/move.pass.cpp b/libcxx/test/input.output/string.streams/istringstream/istringstream.assign/move.pass.cpp
index 6e20640c977..a3e869de2d9 100644
--- a/libcxx/test/input.output/string.streams/istringstream/istringstream.assign/move.pass.cpp
+++ b/libcxx/test/input.output/string.streams/istringstream/istringstream.assign/move.pass.cpp
@@ -33,6 +33,24 @@ int main()
         ss >> i;
         assert(i == 456);
     }
+	{
+		std::istringstream s1("Aaaaa Bbbbb Cccccccccc Dddddddddddddddddd");
+		std::string s;
+		s1 >> s;
+
+		std::istringstream s2 = std::move(s1);
+		s2 >> s;
+		assert(s == "Bbbbb");
+
+		std::istringstream s3;
+		s3 = std::move(s2);
+		s3 >> s;
+		assert(s == "Cccccccccc");
+
+		s1 = std::move(s3);
+		s1 >> s;
+		assert(s == "Dddddddddddddddddd");
+	}
     {
         std::wistringstream ss0(L" 123 456");
         std::wistringstream ss;
@@ -46,5 +64,23 @@ int main()
         ss >> i;
         assert(i == 456);
     }
+	{
+		std::wistringstream s1(L"Aaaaa Bbbbb Cccccccccc Dddddddddddddddddd");
+		std::wstring s;
+		s1 >> s;
+
+		std::wistringstream s2 = std::move(s1);
+		s2 >> s;
+		assert(s == L"Bbbbb");
+
+		std::wistringstream s3;
+		s3 = std::move(s2);
+		s3 >> s;
+		assert(s == L"Cccccccccc");
+
+		s1 = std::move(s3);
+		s1 >> s;
+		assert(s == L"Dddddddddddddddddd");
+	}
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 }