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#[macro_export]
#[doc(hidden)]
macro_rules! __internal_replace_expr {
($_t:tt $sub:expr) => {
$sub
};
}
#[macro_export]
#[doc(hidden)]
macro_rules! __internal_count_tts {
($($tts:tt)*) => {<[()]>::len(&[$($crate::__internal_replace_expr!($tts ())),*])};
}
#[macro_export]
macro_rules! slab {
($( $x:expr ),* $(,)?) => {{
#[allow(unused_mut)]
let mut temp_slab = slab::Slab::with_capacity($crate::__internal_count_tts!($($x)*));
let keys = [$(temp_slab.insert($x), )*];
(temp_slab, keys)
}};
}
#[cfg(test)]
mod test {
use super::slab;
#[test]
fn slab_macro_can_create_empty_slab() {
let (slab, []): (slab::Slab<i32>, [usize; 0]) = slab![];
assert!(slab.is_empty());
}
#[test]
fn slab_macro_works() {
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 slab_macro_with_trailing_comma_works() {
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));
}
}