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// Copyright 2020 ZomboDB, LLC <zombodb@gmail.com>. All rights reserved. Use of this source code is
// governed by the MIT license that can be found in the LICENSE file.


use crate::{pg_sys, FromDatum, PgBox};

pub struct Internal<T>(pub PgBox<T>);

impl<T> FromDatum for Internal<T> {
    #[inline]
    unsafe fn from_datum(
        datum: pg_sys::Datum,
        is_null: bool,
        _: pg_sys::Oid,
    ) -> Option<Internal<T>> {
        if is_null {
            None
        } else if datum == 0 {
            panic!("Internal-type Datum flagged not null but its datum is zero")
        } else {
            Some(Internal::<T>(PgBox::<T>::from_pg(datum as *mut T)))
        }
    }
}