Forcing type-of emulation on Sun.

Trying to fix OverloadedFunction pp bug on Sun by removing SUB on iteration range (doing ADD on iteration index instead).

[SVN r77940]

overloaded_function/test/identity.hpp

@@ -8,10 +8,10 @@
 #ifndef IDENTITY_HPP_
 #define IDENTITY_HPP_
 
-/** @todo #include <boost/function.hpp> */
 //[identity_typeof
 #include <boost/typeof/std/string.hpp> // No need to register `boost::function`.
 //]
+#include <boost/function.hpp>
 #include <string>
 
 //[identity_decls