Initial commit

crates/std/src/arena/ptr.rs

@@ -0,0 +1,59 @@
+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;