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use primitives::{Event};

use downcast::Downcast;

use std::any::Any;

// ++++++++++++++++++++ BufferBase ++++++++++++++++++++

pub trait BufferBase: Any + Sync + Send {
    fn len(&self) -> usize;

    fn clear(&mut self);
}

impl_downcast!(BufferBase);

downcast_methods!(BufferBase);

impl<B: BufferBase + ?Sized> BufferBase for Box<B> {
    fn len(&self) -> usize { (**self).len() }

    fn clear(&mut self){ (**self).clear() }
}

// ++++++++++++++++++++ EventBuffer ++++++++++++++++++++

/// Workaround for lack of HK-lifetimes.
pub trait _EventBuffer<'a>: BufferBase {
    type _Event: Event;

    type Iter: Iterator<Item = &'a Self::_Event> + 'a;
}

pub trait EventBuffer: BufferBase
    where Self: for<'a> _EventBuffer<'a, _Event = <Self as EventBuffer>::Event>
{
    type Event: Event; 

    fn write<T>(&mut self, ev: T)
        where T: Into<Self::Event>;

    fn iter<'a>(&'a self) -> <Self as _EventBuffer<'a>>::Iter;
}