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use std::fmt;
use std::marker::PhantomData;
use Predicate;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct NamePredicate<M, Item>
where
M: Predicate<Item>,
Item: ?Sized,
{
inner: M,
name: &'static str,
_phantom: PhantomData<Item>,
}
impl<M, Item> Predicate<Item> for NamePredicate<M, Item>
where
M: Predicate<Item>,
Item: ?Sized,
{
fn eval(&self, item: &Item) -> bool {
self.inner.eval(item)
}
}
impl<M, Item> fmt::Display for NamePredicate<M, Item>
where
M: Predicate<Item>,
Item: ?Sized,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.name)
}
}
pub trait PredicateNameExt<Item: ?Sized>
where
Self: Predicate<Item>,
{
fn name(self, name: &'static str) -> NamePredicate<Self, Item>
where
Self: Sized,
{
NamePredicate {
inner: self,
name,
_phantom: PhantomData,
}
}
}
impl<P, Item> PredicateNameExt<Item> for P
where
P: Predicate<Item>,
Item: ?Sized,
{
}