StringRef: Extend constexpr capabilities and introduce ConstStringRef

[oota-llvm.git] / unittests / ADT / StringRefTest.cpp

diff --git a/unittests/ADT/StringRefTest.cpp b/unittests/ADT/StringRefTest.cpp
index 0ab8fcf6f002ec935a055007b43c133bd1bc17cc..b240a87ef7544a483dc7d2340f76be45c63e9cda 100644 (file)
--- a/unittests/ADT/StringRefTest.cpp
+++ b/unittests/ADT/StringRefTest.cpp
@@ -531,4 +531,22 @@ TEST(StringRefTest, joinStrings) {
   EXPECT_TRUE(v2_join3);
 }
 
+static void fn_stringref(StringRef str) {
+  EXPECT_TRUE(str == "hello");
+}
+static void fn_conststringref(ConstStringRef str) {
+  fn_stringref(str);
+}
+
+TEST(StringRefTest, constStringRef) {
+  LLVM_CONSTEXPR ConstStringRef csr("hello");
+#if __has_feature(cxx_constexpr) || defined(__GXX_EXPERIMENTAL_CXX0X__)
+  LLVM_STATIC_ASSERT(csr[0] != csr[1], "");
+  LLVM_STATIC_ASSERT(csr[2] == csr[3], "");
+  LLVM_STATIC_ASSERT(csr.size() == 5, "");
+#endif
+  llvm_expect(csr[2] == csr[3]);
+  fn_conststringref(csr);
+}
+
 } // end anonymous namespace