From 98e9fe45c48231d2f2eaba8b4bac07702670362a Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Thu, 6 Dec 2018 15:58:23 +1100
Subject: [PATCH] cast: silence warnings when lossless casting to smaller sized
 enums

---
 cast.hpp | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/cast.hpp b/cast.hpp
index 86ead4c2..d46c4535 100644
--- a/cast.hpp
+++ b/cast.hpp
@@ -116,9 +116,16 @@ namespace cruft::cast {
         // is lossless.
         CHECK_EQ (static_cast<SrcT> (dst), src);
         return dst;
-
 #else
-        return static_cast<DstT> (src);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wshorten-64-to-32"
+        if constexpr (std::is_enum_v<DstT>) {
+            auto const val = static_cast<std::underlying_type_t<DstT>> (src);
+            return static_cast<DstT> (val);
+        } else {
+            return static_cast<DstT> (src);
+        }
+#pragma GCC diagnostic pop
 #endif
     }