From 90c60ddd58d831c821a580fc7de59d1ee004f740 Mon Sep 17 00:00:00 2001
From: mutouyun <orz@orzz.org>
Date: Fri, 4 Jan 2019 22:26:40 +0800
Subject: [PATCH] std::atomic<T> may not have value_type

---
 include/circ_elems_array.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/circ_elems_array.h b/include/circ_elems_array.h
index d989dbf..be45ee5 100644
--- a/include/circ_elems_array.h
+++ b/include/circ_elems_array.h
@@ -122,7 +122,11 @@ struct prod_cons<relat::single, relat::multi, trans::broadcast> {
     template <std::size_t DataSize>
     constexpr static std::size_t elem_param = DataSize;
 
-    using rc_t = typename decltype(detail::elem_head::rc_)::value_type;
+    /*
+        <Remarks> std::atomic<T> may not have value_type.
+        See: https://stackoverflow.com/questions/53648614/what-happened-to-stdatomicxvalue-type
+    */
+    using rc_t = decltype(detail::elem_head::rc_.load());
 
     detail::u2_t cursor() const noexcept {
         return wt_.load(std::memory_order_acquire);