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#![feature(decl_macro, macro_at_most_once_rep)]
#[allow(unused_macros)]
#[doc(hidden)]
macro replace_expr($_t:tt $sub:expr) {
$sub
}
#[allow(unused_macros)]
#[doc(hidden)]
macro count_tts {
($($tts:tt)*) => {<[()]>::len(&[$(crate::replace_expr!($tts ())),*])};
}
pub macro slab {
($( $x:expr ),* $(,)?) => {{
let mut temp_slab = slab::Slab::with_capacity(crate::count_tts!($($x)*));
let keys = [$(temp_slab.insert($x), )*];
(temp_slab, keys)
}};
}
#[cfg(test)]
mod test {
use super::slab;
#[test]
fn test_slab_macro() {
let (slab, [first, second, third]) = slab![10, 20, 30];
assert_eq!(Some(&10), slab.get(first));
assert_eq!(Some(&20), slab.get(second));
assert_eq!(Some(&30), slab.get(third));
}
#[test]
fn test_slab_macro_with_trailing_comma() {
let (slab, [first, second, third]) = slab![10, 20, 30,];
assert_eq!(Some(&10), slab.get(first));
assert_eq!(Some(&20), slab.get(second));
assert_eq!(Some(&30), slab.get(third));
}
}