From bdb1839cbe3543482eee7325cbfdf1429b9848e0 Mon Sep 17 00:00:00 2001
From: Hauke Strasdat <strasdat@gmail.com>
Date: Tue, 31 Oct 2023 09:46:15 -0700
Subject: [PATCH] fix: ceres jet compilation on gcc #2

---
 cpp/sophus/linalg/homogeneous.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cpp/sophus/linalg/homogeneous.h b/cpp/sophus/linalg/homogeneous.h
index 4c1eb0fc..91ee26c2 100644
--- a/cpp/sophus/linalg/homogeneous.h
+++ b/cpp/sophus/linalg/homogeneous.h
@@ -29,7 +29,8 @@ auto proj(Eigen::MatrixBase<TPoint> const& p)
 /// point: (z*a, z*b, z). Z defaults to 1.
 template <class TPoint>
 auto unproj(
-    Eigen::MatrixBase<TPoint> const& p, const typename TPoint::Scalar& z = 1.0)
+    Eigen::MatrixBase<TPoint> const& p,
+    const typename TPoint::Scalar& z = typename TPoint::Scalar(1.0))
     -> Eigen::Vector<typename TPoint::Scalar, TPoint::RowsAtCompileTime + 1> {
   using Scalar = typename TPoint::Scalar;
   static_assert(TPoint::ColsAtCompileTime == 1, "p must be a column-vector");