Re: [Boost-users] [mpl, enable_if] "Failed to specialize function template"

But do the solutions I proposed to Your simplified example compile on Your compiler? If they do, what's wrong with applying them to your process() funcions?

Ah, sorry, I judged too quickly... You're right, adding a simple overload for int (or for void_ in my real case) seems to be exactly what I need. Thanks a lot!