use std::num::NonZeroU32;

#[macro_export]
#[doc(hidden)]
macro_rules! _ptrs {
    ($(
        $(#[$outer:meta])*
        $vis:vis struct $name:ident;
    )*) => {$(
        $(#[$outer])*
        #[derive(
            Debug,
            Clone,
            Copy,
            PartialEq,
            Eq,
            PartialOrd,
            Ord,
            Hash,
        )]
        $vis struct $name(::core::num::NonZeroU32);

        impl $name {
            /// Create instance of the pointer.
            pub const fn new(v: ::core::num::NonZeroU32) -> Self {
                Self(v)
            }

            pub const fn get(&self) -> ::core::num::NonZeroU32 {
                self.0
            }
        }

        impl ::core::convert::From<$name> for ::core::num::NonZeroU32 {
            fn from(value: $name) -> Self {
                value.get()
            }
        }

        impl ::core::convert::From<::core::num::NonZeroU32> for $name {
            fn from(value: ::core::num::NonZeroU32) -> Self {
                Self::new(value)
            }
        }

        impl $crate::arena::ptr::Ptr for $name {
            fn get(&self) -> ::core::num::NonZeroU32 {
                self.0
            }
        }
    )*};
}

/// Pointer in arena.
pub trait Ptr {
    fn get(&self) -> NonZeroU32;
}

pub use crate::_ptrs as define;