From 2b70161b4f5961c313439ef8a132c4dfcd597216 Mon Sep 17 00:00:00 2001 From: QuietMisdreavus Date: Fri, 17 Mar 2017 09:47:45 -0500 Subject: [PATCH] add macros4 example --- macros/macros4.rs | 76 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 macros/macros4.rs diff --git a/macros/macros4.rs b/macros/macros4.rs new file mode 100644 index 00000000..57dc431d --- /dev/null +++ b/macros/macros4.rs @@ -0,0 +1,76 @@ +// Make me compile! Scroll down for hints :) + +macro_rules! my_macro { + () => { + println!("Check out my macro!"); + } + ($val:expr) => { + println!("Look at this other macro: {}", $val); + } +} + +fn main() { + my_macro!(); + my_macro!(7777); +} + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +// You only need to add a single character to make this compile. + + + + + + + + + +// The way macros are written, it wants to see something between each "macro arm", so it can +// separate them.