From 0e898d90941245b412a0e2912e09e7bc315c71eb Mon Sep 17 00:00:00 2001
From: Laurent Rineau <laurent.rineau@cgal.org>
Date: Tue, 8 Nov 2022 12:00:13 +0100
Subject: [PATCH] decltype(auto) for Bbox_[23]

In the cartesian converter, the conversion of a bbox (2D or 3D)
returns a reference.
---
 Filtered_kernel/include/CGAL/Converting_construction.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Filtered_kernel/include/CGAL/Converting_construction.h b/Filtered_kernel/include/CGAL/Converting_construction.h
index 2f6da83df49..42076b5d20f 100644
--- a/Filtered_kernel/include/CGAL/Converting_construction.h
+++ b/Filtered_kernel/include/CGAL/Converting_construction.h
@@ -37,7 +37,7 @@ struct Converting_construction
 
   template <typename... Args,
             std::enable_if_t<!CartesianFunctors::Is_trivial_construction<Source_construction, Args...>::value>* = nullptr>
-  auto operator()(Args&&... args) const {
+  decltype(auto) operator()(Args&&... args) const {
     return backward_convert(construct(convert(args)...));
   }
 };