On 13-04-04 03:01 PM, Jeaye Wilkerson wrote: > > On Apr 4, 2013, at 2:55 PM, Steve Klabnik wrote: > >> You should probably be using macros where you were using C++ templates, no? > > > Ahh, you're right. I see now that macros can essentially be C++ templates; > plug in a type and see if it compiles! An epiphanic moment, indeed.
Not quite. It won't do SFINAE or backtracking. If the syntax fits, it'll expand, regardless of types. If the types don't fit, typechecking will fail-fail and the macro won't try some other pattern. So it's not quite the same as templates. As patrick said, it's more like templates-with-concepts (and without backtracking). I _believe_ the type system remains non-turing-complete. That's always been a goal for me anyway! (The macro system is turing complete, but apparently this is pretty much the norm in macro systems. It's not type-aware, which is what you were after.) -Graydon _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
