commit e3c71ae24a6f680d23b694a73e7730728e6d850a
author Marshall Clow <mclow.lists@gmail.com> Fri May 25 02:08:49 2018 +0000
committer Marshall Clow <mclow.lists@gmail.com> Fri May 25 02:08:49 2018 +0000
tree fa275873324152c3f41d5d6612cf9681b93c0c66
parent a69972e44889e5412307692d824cb64715098ef9

Add deduction guides for optional

llvm-svn: 333251
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: f35b4bc3954f3b01051fc0848535ff784809e9e2

include/optional

diff --git a/include/optional b/include/optional
index 1f8e491..a76f8d1 100644
--- a/include/optional
+++ b/include/optional
@@ -139,6 +139,10 @@
   private:
     T *val; // exposition only
   };
+
+template<class T>
+  optional(T) -> optional<T>;
+
 } // namespace std
 
 */
@@ -1003,6 +1007,11 @@
     }
 };
 
+#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
+template<class T>
+    optional(T) -> optional<T>;
+#endif
+
 // Comparisons between optionals
 template <class _Tp, class _Up>
 _LIBCPP_INLINE_VISIBILITY constexpr