From 91aa5250de170bd5683e87c1ef5cd22f3bf75e11 Mon Sep 17 00:00:00 2001
From: "Gustavo J. A. M. Carneiro" <gjc@inescporto.pt>
Date: Tue, 19 Jun 2007 16:59:44 +0100
Subject: [PATCH] Add Ipv4Address operator <, to allow Ipv4Address to be used
 in std::set; Closes #39.

---
 src/node/ipv4-address.cc | 5 +++++
 src/node/ipv4-address.h  | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/src/node/ipv4-address.cc b/src/node/ipv4-address.cc
index ca36d8083..f8ff9f7a6 100644
--- a/src/node/ipv4-address.cc
+++ b/src/node/ipv4-address.cc
@@ -215,6 +215,11 @@ bool operator != (Ipv4Address const &a, Ipv4Address const &b)
 {
   return !a.IsEqual (b);
 }
+bool operator < (Ipv4Address const &addrA, Ipv4Address const &addrB)
+{
+  return (addrA.GetHostOrder () < addrB.GetHostOrder ());
+}
+
 size_t Ipv4AddressHash::operator()(Ipv4Address const &x) const 
 { 
   return x.GetHostOrder ();
diff --git a/src/node/ipv4-address.h b/src/node/ipv4-address.h
index a0714ac26..dc834052a 100644
--- a/src/node/ipv4-address.h
+++ b/src/node/ipv4-address.h
@@ -122,6 +122,8 @@ std::ostream& operator<< (std::ostream& os, Ipv4Mask const& mask);
 
 bool operator == (Ipv4Address const &a, Ipv4Address const &b);
 bool operator != (Ipv4Address const &a, Ipv4Address const &b);
+bool operator < (Ipv4Address const &addrA, Ipv4Address const &addrB);
+
 class Ipv4AddressHash : public std::unary_function<Ipv4Address, size_t> {
 public:
   size_t operator()(Ipv4Address const &x) const;