From d2aa7ca9fe6aa7a94f92e600bab37cbe0aaa04f5 Mon Sep 17 00:00:00 2001
From: Intege-rs <me@jessiep.me>
Date: Sun, 29 Dec 2024 14:01:25 -0500
Subject: [PATCH] alignment macro

---
 sub/core/src/align.rs | 26 ++++++++++++++++++++++++++
 sub/core/src/lib.rs   |  2 ++
 2 files changed, 28 insertions(+)
 create mode 100644 sub/core/src/align.rs

diff --git a/sub/core/src/align.rs b/sub/core/src/align.rs
new file mode 100644
index 0000000..db1d9db
--- /dev/null
+++ b/sub/core/src/align.rs
@@ -0,0 +1,26 @@
+
+pub struct Align<const ALIGNMENT: usize>( <Self as Aligned>::Alignment ) where Self: Aligned;
+pub trait Aligned { type Alignment; }
+
+macro_rules! gen_alignment {
+    ($($alignment:literal),+) => {
+        $(
+            const _: () = {
+                #[repr(align($alignment))] pub struct Anon;
+                impl Aligned for Align<$alignment> {
+                    type Alignment = Anon;
+                }
+                assert!(align_of::<Align<$alignment>>() == $alignment)
+            };
+        )+
+    };
+}
+
+gen_alignment!(
+    1, 2, 4, 8, 16, 32, 64, 128, 256, 512,
+    1024, 2048, 4096, 8192, 16384, 32768,
+    65536, 131072, 262144, 524288, 1048576,
+    2097152, 4194304, 8388608, 16777216,
+    33554432, 67108864, 134217728, 268435456,
+    536870912);
+
diff --git a/sub/core/src/lib.rs b/sub/core/src/lib.rs
index bf11b8d..8e7e311 100644
--- a/sub/core/src/lib.rs
+++ b/sub/core/src/lib.rs
@@ -20,6 +20,7 @@ pub mod time;
 
 pub mod fnv1;
 pub mod pstruct;
+pub mod align;
 
 //
 // Export Preludes:
@@ -51,6 +52,7 @@ pub mod prelude {
     pub use crate::fnv1::*;
     pub use crate::pstruct::struct_offset;
     pub use crate::pod::{Pod,Mut};
+    pub use crate::align::Align;
 }
 
 pub mod public {