From e41be4bff28c9cb0533b7ef115f1a3dd072d282f Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Mon, 22 Sep 2025 21:12:13 -0400
Subject: [PATCH] xo-unit: bugfix: need ppdetail_atomic guard

---
 xo-unit/include/xo/unit/quantity_iostream.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xo-unit/include/xo/unit/quantity_iostream.hpp b/xo-unit/include/xo/unit/quantity_iostream.hpp
index 5bc58d0b..eaf0ac0f 100644
--- a/xo-unit/include/xo/unit/quantity_iostream.hpp
+++ b/xo-unit/include/xo/unit/quantity_iostream.hpp
@@ -22,14 +22,17 @@ namespace xo {
     } /*namespace qty*/
 
     namespace print {
+#ifndef ppdetail_atomic
         template <auto NaturalUnit, typename Repr>
         struct ppdetail<xo::qty::quantity<NaturalUnit, Repr>> {
             using target_type = xo::qty::quantity<NaturalUnit, Repr>;
+
             static bool print_pretty(const ppindentinfo & ppii,
                                      const target_type & x) {
                 return ppdetail_atomic<target_type>::print_pretty(ppii, x);
             }
         };
+#endif
     } /*namespace print*/
 } /*namespace xo*/