From ec1d4b1630807b3afd9840e2b3b77a11c72bef7c Mon Sep 17 00:00:00 2001
From: Raman Hafiyatulin <r.gafiyatullin@me.com>
Date: Tue, 3 Feb 2026 00:18:00 +0200
Subject: [PATCH] feat: rkyv for `FixedPoint<I,P>`

---
 Cargo.toml       |  2 ++
 src/lib.rs       |  4 ++++
 tests/it/main.rs |  1 +
 tests/it/rkyv.rs | 33 +++++++++++++++++++++++++++++++++
 4 files changed, 40 insertions(+)
 create mode 100644 tests/it/rkyv.rs

diff --git a/Cargo.toml b/Cargo.toml
index 0c72359..b140467 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,12 +37,14 @@ i16 = []
 i32 = []
 i64 = []
 i128 = ["dep:i256"]
+rkyv = ["dep:rkyv"]
 serde = ["dep:serde"]
 schemars = ["dep:schemars"]
 parity = ["parity-scale-codec"]
 quick-xml = ["serde?/derive", "serde?/alloc"] # FIXME: quick-xml#473
 
 [dependencies]
+rkyv = { version = "0.8.14", optional = true }
 serde = { version = "1.0", default-features = false, optional = true }
 schemars = { version = "0.8", default-features = false, optional = true }
 typenum = "1.12.0"
diff --git a/src/lib.rs b/src/lib.rs
index 0a6ef88..37c7a25 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -201,6 +201,10 @@ type Result<T, E = ArithmeticError> = core::result::Result<T, E>;
     docsrs,
     doc(cfg(any(feature = "i128", feature = "i64", feature = "i32", feature = "i16")))
 )]
+#[cfg_attr(
+    feature = "rkyv",
+    derive(rkyv::Archive, rkyv::Serialize, rkyv::Deserialize)
+)]
 #[repr(transparent)]
 pub struct FixedPoint<I, P> {
     inner: I,
diff --git a/tests/it/main.rs b/tests/it/main.rs
index 6bad759..a98033f 100644
--- a/tests/it/main.rs
+++ b/tests/it/main.rs
@@ -185,3 +185,4 @@ mod convert_f64;
 mod convert_str;
 mod ops;
 mod serde;
+mod rkyv;
diff --git a/tests/it/rkyv.rs b/tests/it/rkyv.rs
new file mode 100644
index 0000000..d448f09
--- /dev/null
+++ b/tests/it/rkyv.rs
@@ -0,0 +1,33 @@
+#![cfg(feature = "rkyv")]
+
+use fixnum::*;
+use anyhow::Result;
+use rkyv::rancor::Error;
+
+#[test]
+fn rkyv_basic() -> Result<()> {
+    test_fixed_point! {
+        case (a: FixedPoint, b: FixedPoint) => {
+            let a_ = rkyv::to_bytes::<Error>(&a)?;
+            let b_ = rkyv::to_bytes::<Error>(&b)?;
+            assert_eq!(
+                rkyv::deserialize::<FixedPoint, Error>(
+                    rkyv::access::<<FixedPoint as rkyv::Archive>::Archived, Error>(&a_)?)?, a);
+            assert_eq!(
+                rkyv::deserialize::<FixedPoint, Error>(
+                    rkyv::access::<<FixedPoint as rkyv::Archive>::Archived, Error>(&b_)?)?, b);
+
+
+            let ab = vec![a,b];
+            let ab_ = rkyv::to_bytes::<Error>(&ab)?;
+            let ab_access = rkyv::access::<<Vec<FixedPoint> as rkyv::Archive>::Archived, Error>(&ab_)?;
+            assert_eq!(rkyv::deserialize::<FixedPoint, Error>(&ab_access[0])?, a);
+            assert_eq!(rkyv::deserialize::<FixedPoint, Error>(&ab_access[1])?, b);
+        },
+        all {
+            (fp!(64.0), fp!(13.13));
+        },
+    };
+    Ok(())
+}
+