macro_rules! first_opt
{
($O: expr , $P: pat => $B: expr ) =>
(
for o in $O.iter()
{
match *o
{
$P =>
{
$B
break;
},
_ => ()
};
}
)
}
macro_rules! first_opt_default
{
($O: expr , $P: pat => $B: expr , _ => $E: expr ) =>
(
{
let mut found = false;
for o in $O.iter()
{
match *o
{
$P =>
{
found = true;
$B
break;
},
_ => ()
};
}
if !found
{
$E
}
}
)
}
pub(crate) trait OneWayOwned
{
type Output;
fn to_one_way_owned(&self) -> Self::Output;
}
impl<'l, T: OneWayOwned> OneWayOwned for &'l [T]
{
type Output = Vec<<T as OneWayOwned>::Output>;
fn to_one_way_owned(&self) -> Self::Output
{
self.iter().map(|v| v.to_one_way_owned()).collect()
}
}