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use once_cell::sync::OnceCell;

pub struct PgAtomic<T> {
    inner: OnceCell<*mut T>,
}

impl<T> PgAtomic<T> {
    pub const fn new() -> Self {
        Self {
            inner: OnceCell::new(),
        }
    }
}

impl<T> PgAtomic<T>
where
    T: atomic_traits::Atomic + Default,
{
    pub fn attach(&self, value: *mut T) {
        self.inner
            .set(value)
            .expect("This PgAtomic is not empty, can't re-attach");
    }

    pub fn get(&self) -> &T {
        unsafe {
            self.inner
                .get()
                .expect("This PgAtomic as not been initialized")
                .as_ref()
                .unwrap()
        }
    }
}

unsafe impl<T> Send for PgAtomic<T> where T: atomic_traits::Atomic + Default {}
unsafe impl<T> Sync for PgAtomic<T> where T: atomic_traits::Atomic + Default {}