From: Otto Moerbeek <otto.moerbeek@open-xchange.com>
Date: Wed, 17 Aug 2022 12:22:00 +0000 (+0200)
Subject: Introduce standard hash function for Netmask
X-Git-Tag: rec-4.9.0-alpha0~22^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7da536dfba3bb91c6e4086faf9d139d000bc02e7;p=thirdparty%2Fpdns.git

Introduce standard hash function for Netmask
---

diff --git a/pdns/iputils.hh b/pdns/iputils.hh
index 2049bc35bc..af3c2cc74a 100644
--- a/pdns/iputils.hh
+++ b/pdns/iputils.hh
@@ -693,12 +693,28 @@ public:
     return d_network.getBit(bit);
   }
 
+  struct Hash {
+    size_t operator()(const Netmask& nm) const
+    {
+      return burtle(&nm.d_bits, 1, ComboAddress::addressOnlyHash()(nm.d_network));
+    }
+  };
+
 private:
   ComboAddress d_network;
   uint32_t d_mask;
   uint8_t d_bits;
 };
 
+namespace std {
+  template<>
+  struct hash<Netmask> {
+    auto operator()(const Netmask& nm) const {
+      return Netmask::Hash{}(nm);
+    }
+  };
+}
+
 /** Binary tree map implementation with <Netmask,T> pair.
  *
  * This is an binary tree implementation for storing attributes for IPv4 and IPv6 prefixes.