Macros can be overloaded to accept different combinations of arguments.
// macro_rules! is similar to a match block
macro_rules! test {
// the arguments don't need to be separated by a comma
// any template can be used
($left:expr; and $right:expr) => (
println!("{:?} and {:?} is {:?}",
stringify!($left),
stringify!($right),
$left && $right)
);
// ^ each arm must be ended with a semicolon
($left:expr; or $right:expr) => (
println!("{:?} or {:?} is {:?}",
stringify!($left),
stringify!($right),
$left || $right)
);
}
fn main() {
test!(1i32 + 1 == 2i32; and 2i32 * 2 == 4i32);
test!(true; or false);
}