alignment macro

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);
+