iterator/zip: prefer std::size over .size

iterator/zip.hpp

@@ -158,7 +158,7 @@ namespace cruft::iterator {
             {
                 // All stores should have the same size so we arbitrarily pick
                 // the first to query.
-                return std::get<0> (m_store).size ();
+                return std::size (std::get<0> (m_store));
             }
 
 
@@ -208,7 +208,9 @@ namespace cruft::iterator {
         // The call to `zip` will peform more rigorous tests on the sizes
         // of the container collection.
         return zip (
-            iota (::cruft::variadic::get<0> (data...).size ()),
+            iota (
+                std::size (::cruft::variadic::get<0> (data...))
+            ),
             std::forward<ContainerT> (data)...
         );
     }