From dd5e1852f9f5b95c1456ecdbe5087d2cc1d9c949 Mon Sep 17 00:00:00 2001
From: bolshoytoster <toasterbig@gmail.com>
Date: Wed, 2 Sep 2026 19:26:41 +0100
Subject: [PATCH] Port #392 to v2

---
 Cargo.toml      |  5 +++++
 src/lib.rs      |  8 ++++++++
 tests/encase.rs | 20 ++++++++++++++++++++
 3 files changed, 33 insertions(+)
 create mode 100644 tests/encase.rs

diff --git a/Cargo.toml b/Cargo.toml
index b19500b..39979ad 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,6 +30,7 @@ arbitrary = { version = "1.4", optional = true, default-features = false }
 borsh = { version = "1.8", optional = true, features = ["derive", "unstable__schema"], default-features = false }
 bytes = { version = "1.12", optional = true, default-features = false }
 defmt = { version = "1.1", optional = true, default-features = false }
+encase = { version = "0.12", optional = true, default-features = false }
 rayon = { version = "1.12", optional = true, default-features = false }
 serde_core = { version = "1.0", optional = true, default-features = false }
 malloc_size_of = { version = "0.1", optional = true, default-features = false }
@@ -50,6 +51,10 @@ required-features = ["borsh"]
 name = "bytes"
 required-features = ["bytes"]
 
+[[test]]
+name = "encase"
+required-features = ["encase"]
+
 [[test]]
 name = "rayon"
 required-features = ["rayon"]
diff --git a/src/lib.rs b/src/lib.rs
index 99aeff5..5158233 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -52,6 +52,11 @@
 //! [Rustonomicon](https://doc.rust-lang.org/1.42.0/nomicon/dropck.html#an-escape-hatch).
 //!
 //! Tracking issue: [rust-lang/rust#34761](https://github.com/rust-lang/rust/issues/34761)
+//!
+//! ### `encase`
+//!
+//! When this optional dependency is enabled, `SmallVec` implements `encase`'s
+//! traits.
 
 #![no_std]
 #![cfg_attr(docsrs, feature(doc_cfg))]
@@ -2814,3 +2819,6 @@ impl<T: Format, const N: usize> Format for SmallVec<T, N> {
         dewrite!(fmt, "{=[?]}", self.as_ref());
     }
 }
+
+#[cfg(feature = "encase")]
+encase::rts_array::impl_rts_array!(SmallVec<T, N>; (T, const N: usize); using len truncate);
diff --git a/tests/encase.rs b/tests/encase.rs
new file mode 100644
index 0000000..d871637
--- /dev/null
+++ b/tests/encase.rs
@@ -0,0 +1,20 @@
+use smallvec::SmallVec;
+
+#[test]
+fn test_encase() {
+    let v = SmallVec::<f32, 3>::from([1.43_f32, 4.05, 4.55]);
+
+    let mut buf = [255u8; 12];
+    let mut s_buf = encase::StorageBuffer::new(&mut buf);
+
+    s_buf.write(&v).unwrap();
+    assert_eq!(&s_buf.as_ref()[0..][..4], &v[0].to_le_bytes());
+    assert_eq!(&s_buf.as_ref()[4..][..4], &v[1].to_le_bytes());
+    assert_eq!(&s_buf.as_ref()[8..][..4], &v[2].to_le_bytes());
+
+    let mut v_out: SmallVec<f32, 3> = SmallVec::new();
+    s_buf.read(&mut v_out).unwrap();
+    assert_eq!(v, v_out);
+
+    assert_eq!(v, s_buf.create::<SmallVec<f32, 3>>().unwrap());
+}