reference.html:

  - Document semantics of reference_wrapper usage

tutorial.html:
  - Add short discussion and example of ref() and cref()


[SVN r11874]

libs/function

@@ -1 +1 @@
-Subproject commit 1512df77b131610fe978d7d3e065459f9b12c6dc
+Subproject commit 2e67e2126bfe4478b421ff894768ed81ec4e0770