use nonassignable

added same_closure consistently


[SVN r24526]

libs/numeric/ublas

@@ -1 +1 @@
-Subproject commit 3f55c7c4e3d9c426a6caf17dccca903fa8e5a9da
+Subproject commit 8bb8f8e6465985ec80f6ab3adda4bd5cb79c6bf8