From d24c4eec691053f50704c2edcbca6358179014f2 Mon Sep 17 00:00:00 2001
From: Otto Moerbeek <otto.moerbeek@open-xchange.com>
Date: Wed, 17 Jul 2019 10:57:44 +0200
Subject: [PATCH] Add static assert to ensure T is unsigned.

---
 pdns/misc.hh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pdns/misc.hh b/pdns/misc.hh
index 0ead1e41ba..5a8bc2b22b 100644
--- a/pdns/misc.hh
+++ b/pdns/misc.hh
@@ -112,6 +112,7 @@ stringtok (Container &container, string const &in,
 
 template<typename T> bool rfc1982LessThan(T a, T b)
 {
+  static_assert(std::is_unsigned<T>::value, "rfc1982LessThan only works for unsigned types");
   typedef typename std::make_signed<T>::type signed_t;
   return static_cast<signed_t>(a - b) < 0;
 }
-- 
2.47.2