Library: expose some diagnostics on IterStack / IterQueue by default

seems like most usages will want to expose this kind of diagnostics for unit testing
and in fact the queue or stack nature is the primary nature of this entity,
while iterability comes as additional trait

src/lib/iter-stack.hpp

@@ -67,8 +67,9 @@
 
 namespace lib {
   
+  using util::unConst;
+  
   namespace iter {
-    using util::unConst;
     
     /**
      * Wrapper to mark a std::deque instance for use
@@ -153,6 +154,21 @@ namespace lib {
           this->stateCore().pop_back();
           return topElement;
         }
+      
+      
+      /* == diagnostics == */
+      
+      size_t
+      size()  const
+        {
+          return unConst(this)->stateCore().size();
+        }
+      
+      bool
+      empty() const
+        {
+          return 0 == size();
+        }
     };
   
   
@@ -208,6 +224,21 @@ namespace lib {
         }
       
       
+      /* == diagnostics == */
+      
+      size_t
+      size()  const
+        {
+          return unConst(this)->stateCore().size();
+        }
+      
+      bool
+      empty() const
+        {
+          return 0 == size();
+        }
+      
+      
       /** 
        * Adapter for use as opaque sequence.
        * This builder exposes generic operations

src/proc/control/command-queue.hpp

@@ -87,21 +87,6 @@ namespace control {
         {
           this->stateCore().clear();
         }
-      
-      
-      /* == diagnostics == */
-      
-      size_t
-      size() const
-        {
-          return unConst(this)->stateCore().size();
-        }
-      
-      bool
-      empty()  const
-        {
-          return 0 == size();
-        }
     };