xtra 0.6.0

A tiny actor framework
Documentation 
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use std::cmp::Ordering;

#[derive(Eq, PartialEq, Ord, PartialOrd, Copy, Clone)]
pub enum Priority {
    Valued(u32),
    Shutdown,
}

impl Default for Priority {
    fn default() -> Self {
        Priority::Valued(0)
    }
}

pub trait HasPriority {
    fn priority(&self) -> Priority;
}

/// A wrapper struct that allows comparison and ordering for anything thas has a priority, i.e. implements [`HasPriority`].
pub struct ByPriority<T>(pub T);

impl<T> HasPriority for ByPriority<T>
where
    T: HasPriority,
{
    fn priority(&self) -> Priority {
        self.0.priority()
    }
}

impl<T> PartialEq for ByPriority<T>
where
    T: HasPriority,
{
    fn eq(&self, other: &Self) -> bool {
        self.0.priority().eq(&other.0.priority())
    }
}

impl<T> Eq for ByPriority<T> where T: HasPriority {}

impl<T> PartialOrd for ByPriority<T>
where
    T: HasPriority,
{
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl<T> Ord for ByPriority<T>
where
    T: HasPriority,
{
    fn cmp(&self, other: &Self) -> Ordering {
        self.0.priority().cmp(&other.0.priority())
    }
}