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#[macro_export]
macro_rules! vecu {
() => {
Vec::new()
};
($($x:expr),+ $(,)?) => {
vec![$($x),+]
};
($($input:tt)*) => {
{
let mut v = Vec::new();
vecu_inner!(v, $($input)*);
v
}
};
}
#[macro_export]
macro_rules! vecu_inner {
($v:ident,) => {};
($v:ident, $x:expr) => {
$v.push($x);
};
($v:ident, @$x:expr) => {
$v.extend($x);
};
($v:ident, $x:expr, $($tail:tt)*) => {
$v.push($x);
vecu_inner!($v, $($tail)*)
};
($v:ident, @$x:expr, $($tail:tt)*) => {
$v.extend($x);
vecu_inner!($v, $($tail)*)
};
}
#[cfg(test)]
mod tests {
use super::vecu;
#[test]
fn empty() {
let vu: Vec<i32> = vecu![];
let v: Vec<i32> = vec![];
assert_eq!(vu, v);
}
#[test]
fn with_tail_comma() {
let a = [2, 3];
let b = vecu![0, 1, @a, 4, 5,];
assert_eq!(b, vec![0, 1, 2, 3, 4, 5]);
}
#[test]
fn without_tail_comma() {
let a = [2, 3];
let b = vecu![0, 1, @a, 4, 5];
assert_eq!(b, vec![0, 1, 2, 3, 4, 5]);
}
#[test]
fn multi_unpack() {
let a = [1, 2];
let b = [3, 4, 5];
let c = vecu![0, @a, @b, 6, 7];
assert_eq!(c, vec![0, 1, 2, 3, 4, 5, 6, 7]);
}
#[test]
fn without_unpack() {
assert_eq!(vecu![0, 1, 2], vec![0, 1, 2]);
}
#[test]
fn unpack_only() {
let a = [1, 2];
let b = vecu![@a];
assert_eq!(b, vec![1, 2]);
}
}