function_base.hpp:

  - has_empty_target modified to deal only with function objects, and to not
    require pointers to the function objects.

function_template.hpp:
  - Don't use '&' operation on incoming function objects


[SVN r13318]

libs/function

@@ -1 +1 @@
-Subproject commit 02f5d9d0e0f49637c8cfc83317444aea8d535bf6
+Subproject commit 28984e4f23345744746db7ba9f9f4c7fe4d9d358