Add tests making sure that optional<T>s can be compared at compile time; this functionality was enabled by N3789

llvm-svn: 192051

1 files changed, 15 insertions, 1 deletions

diff --git a/libcxx/test/utilities/optional/optional.relops/equal.pass.cpp b/libcxx/test/utilities/optional/optional.relops/equal.pass.cpp
index ec0503c39ba..a600d07ecbe 100644
--- a/libcxx/test/utilities/optional/optional.relops/equal.pass.cpp
+++ b/libcxx/test/utilities/optional/optional.relops/equal.pass.cpp
@@ -15,11 +15,25 @@
 #include <type_traits>
 #include <cassert>
 
+#if _LIBCPP_STD_VER > 11
+
+struct X
+{
+    int i_;
+
+    constexpr X(int i) : i_(i) {}
+};
+
+constexpr bool operator == ( const X &rhs, const X &lhs )
+    { return rhs.i_ == lhs.i_ ; }
+    
+#endif
+
 int main()
 {
 #if _LIBCPP_STD_VER > 11
     {
-    typedef int T;
+    typedef X T;
     typedef std::optional<T> O;
     
     constexpr O o1;     // disengaged