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[ceph.git] / ceph / src / boost / boost / hana / fwd / empty.hpp

diff --git a/ceph/src/boost/boost/hana/fwd/empty.hpp b/ceph/src/boost/boost/hana/fwd/empty.hpp
index ed3cc38cc72eef68bb445a51580491dcad332fc7..719f58055fb03eccb730baa608b749b814cd95aa 100644 (file)
--- a/ceph/src/boost/boost/hana/fwd/empty.hpp
+++ b/ceph/src/boost/boost/hana/fwd/empty.hpp
@@ -41,7 +41,9 @@ BOOST_HANA_NAMESPACE_BEGIN
     struct empty_impl : empty_impl<M, when<true>> { };
 
     template <typename M>
-    struct empty_t;
+    struct empty_t {
+        constexpr auto operator()() const;
+    };
 
     template <typename M>
     constexpr empty_t<M> empty{};