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use std::marker::PhantomData;
use std::os::raw::c_void;

pub type Id = *mut c_void;

pub struct Items<T> {
    marker: PhantomData<T>,
}

impl<T> Default for Items<T> {
    fn default() -> Self {
        Items {
            marker: PhantomData,
        }
    }
}

impl<T> super::Items<T> for Items<T> {
    fn register(&mut self, handle: T) -> Id {
        Box::into_raw(Box::new(handle)) as *mut _ as *mut c_void
    }

    fn get(&self, id: Id) -> &T {
        unsafe { (id as *mut T).as_ref() }.unwrap()
    }

    fn get_mut(&mut self, id: Id) -> &mut T {
        unsafe { (id as *mut T).as_mut() }.unwrap()
    }

    fn take(&mut self, id: Id) -> T {
        unsafe { *Box::from_raw(id as *mut T) }
    }
}