From 877e8322d25bafb914a58588c769aeab33277cc1 Mon Sep 17 00:00:00 2001
From: Laurent Rineau <laurent.rineau@cgal.org>
Date: Mon, 22 Apr 2024 14:23:55 +0200
Subject: [PATCH] fix oformat

---
 Stream_support/include/CGAL/IO/io.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Stream_support/include/CGAL/IO/io.h b/Stream_support/include/CGAL/IO/io.h
index 71308a423c6..0a0441857a2 100644
--- a/Stream_support/include/CGAL/IO/io.h
+++ b/Stream_support/include/CGAL/IO/io.h
@@ -248,7 +248,12 @@ Convenience function to construct an output representation (`Output_rep`) for ty
 Generic IO for type `T` with formatting tag.
 */
 template <class T, class F>
-Output_rep<T,F> oformat( const T& t, F format) { return Output_rep<T,F>(t, format); }
+Output_rep<T,F> oformat( const T& t, F format) {
+  if constexpr (std::is_constructible_v<Output_rep<T,F>, const T&, F>)
+    return Output_rep<T,F>(t, format);
+  else
+    return Output_rep<T,F>(t);
+}
 
 } // namespace IO