From cce50f76485e26d72883d8d0af466a01e98c8ee6 Mon Sep 17 00:00:00 2001
From: Benjamin Lieser <benjamin.lieser@mpinat.mpg.de>
Date: Fri, 18 Oct 2024 13:07:02 +0200
Subject: [PATCH] Make SymmetricEigenScalar usable but not implementable

---
 nalgebra-lapack/src/lib.rs             | 2 +-
 nalgebra-lapack/src/symmetric_eigen.rs | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/nalgebra-lapack/src/lib.rs b/nalgebra-lapack/src/lib.rs
index ea2e2b532..ef3abd1a7 100644
--- a/nalgebra-lapack/src/lib.rs
+++ b/nalgebra-lapack/src/lib.rs
@@ -103,7 +103,7 @@ pub use self::qr::QR;
 pub use self::qz::QZ;
 pub use self::schur::Schur;
 pub use self::svd::SVD;
-pub use self::symmetric_eigen::SymmetricEigen;
+pub use self::symmetric_eigen::{SymmetricEigen, SymmetricEigenScalar};
 
 trait ComplexHelper {
     type RealPart;
diff --git a/nalgebra-lapack/src/symmetric_eigen.rs b/nalgebra-lapack/src/symmetric_eigen.rs
index 6fda636ca..3d7eaf956 100644
--- a/nalgebra-lapack/src/symmetric_eigen.rs
+++ b/nalgebra-lapack/src/symmetric_eigen.rs
@@ -161,6 +161,10 @@ where
     }
 }
 
+pub trait Sealed {}
+impl Sealed for f32 {}
+impl Sealed for f64 {}
+
 /*
  *
  * Lapack functions dispatch.
@@ -168,7 +172,7 @@ where
  */
 /// Trait implemented by scalars for which Lapack implements the eigendecomposition of symmetric
 /// real matrices.
-pub trait SymmetricEigenScalar: Scalar {
+pub trait SymmetricEigenScalar: Scalar + Sealed {
     #[allow(missing_docs)]
     fn xsyev(
         jobz: u8,