Remove unneeded iterator increment for the "case 1" switch case

include/boost/container/experimental/segmented_for_each.hpp

@@ -57,7 +57,7 @@ F segmented_for_each_dispatch
          f(*first); ++first;
       BOOST_FALLTHROUGH;
       case 1:
-         f(*first); ++first;
+         f(*first); //No need to increment first since we're done after this.
       BOOST_FALLTHROUGH;
       default:
          break;

include/boost/container/experimental/segmented_generate.hpp

@@ -56,7 +56,7 @@ void segmented_generate_dispatch
          *first = gen(); ++first;
       BOOST_FALLTHROUGH;
       case 1:
-         *first = gen(); ++first;
+         *first = gen(); //No need to increment first since we're done after this.
       BOOST_FALLTHROUGH;
       default:
          break;