From 9acc89dbb4ccab250dcb3bec3cbd2d52d5390690 Mon Sep 17 00:00:00 2001
From: Fan Jiang <ProfFan@users.noreply.github.com>
Date: Sun, 9 Mar 2025 19:41:58 -0700
Subject: [PATCH] Fix ODR violations in Navigation expressions

---
 gtsam/navigation/expressions.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/gtsam/navigation/expressions.h b/gtsam/navigation/expressions.h
index 231ccb20d..a6805deef 100644
--- a/gtsam/navigation/expressions.h
+++ b/gtsam/navigation/expressions.h
@@ -19,13 +19,13 @@ typedef Expression<Velocity3> Velocity3_;
 
 namespace internal {
 // define getters that return a value rather than a reference
-Rot3 attitude(const NavState& X, OptionalJacobian<3, 9> H) {
+inline Rot3 attitude(const NavState& X, OptionalJacobian<3, 9> H) {
   return X.attitude(H);
 }
-Point3 position(const NavState& X, OptionalJacobian<3, 9> H) {
+inline Point3 position(const NavState& X, OptionalJacobian<3, 9> H) {
   return X.position(H);
 }
-Velocity3 velocity(const NavState& X, OptionalJacobian<3, 9> H) {
+inline Velocity3 velocity(const NavState& X, OptionalJacobian<3, 9> H) {
   return X.velocity(H);
 }
 }  // namespace internal