From e6a67b97c228b40c33775bfb819866e95f7493af Mon Sep 17 00:00:00 2001
From: Aki Tuomi <cmouse@desteem.org>
Date: Tue, 1 Sep 2015 11:47:30 +0300
Subject: [PATCH] Use std::distance in dnsname, fix #2721

---
 pdns/dnsname.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pdns/dnsname.cc b/pdns/dnsname.cc
index d9bf435fce..68d51e478d 100644
--- a/pdns/dnsname.cc
+++ b/pdns/dnsname.cc
@@ -112,8 +112,8 @@ bool DNSName::isPartOf(const DNSName& parent) const
     return false;
 
   // this is slightly complicated since we can't start from the end, since we can't see where a label begins/ends then
-  for(auto us=d_storage.cbegin(); us<d_storage.cend() && d_storage.cend()-us >= (unsigned int)parent.d_storage.size(); us+=*us+1) {
-    if (d_storage.cend()-us == (unsigned int)parent.d_storage.size()) {
+  for(auto us=d_storage.cbegin(); us<d_storage.cend() && std::distance(us,d_storage.cend()) >= static_cast<unsigned int>(parent.d_storage.size()); us+=*us+1) {
+    if (std::distance(us,d_storage.cend()) == static_cast<unsigned int>(parent.d_storage.size())) {
       auto p = parent.d_storage.cbegin();
       for(; us != d_storage.cend(); ++us, ++p) {
         if(tolower(*p) != tolower(*us))
-- 
2.47.2