fine-tune code

include/elem_circ.h

@@ -3,6 +3,7 @@
 #include <atomic>
 #include <thread>
 #include <cstring>
+#include <utility>
 
 #include "def.h"
 #include "rw_lock.h"

include/queue.h

@@ -40,8 +40,6 @@ public:
 
     queue(const queue&) = delete;
     queue& operator=(const queue&) = delete;
-    queue(queue&&) = delete;
-    queue& operator=(queue&&) = delete;
 
     constexpr elems_t * elems() const noexcept {
         return elems_;

src/ipc.cpp

@@ -198,7 +198,7 @@ static buff_t recv(handle_t h) {
                 return make_cache(msg.data_, remain);
             }
             // cache the first message fragment
-            else rc.try_emplace(msg.id_, data_length, make_cache(msg.data_, remain));
+            else rc.emplace(msg.id_, cache_t { data_length, make_cache(msg.data_, remain) });
         }
         // has cached before this message
         else {