1 files changed, 8 insertions, 0 deletions
diff --git a/Swiften/Base/Algorithm.h b/Swiften/Base/Algorithm.h
index c481aa8..108dbe3 100644
--- a/Swiften/Base/Algorithm.h
+++ b/Swiften/Base/Algorithm.h
@@ -125,31 +125,39 @@ namespace Swift {
     /*
      * Functors
      */
     template<typename K, typename V>
     class PairFirstEquals {
         public:
             PairFirstEquals(const K& value) : value(value) {
             }
 
             bool operator()(const std::pair<K,V>& pair) const {
                 return pair.first == value;
             }
 
         private:
             K value;
     };
 
     template<typename K, typename V>
     class PairSecondEquals {
         public:
             PairSecondEquals(const V& value) : value(value) {
             }
 
             bool operator()(const std::pair<K,V>& pair) const {
                 return pair.second == value;
             }
 
         private:
             V value;
     };
+
+    template <typename Map>
+    bool key_compare(Map const& lhs, Map const& rhs) {
+
+        auto pred = [](decltype(*lhs.begin()) a, decltype(a) b) { return a.first == b.first; };
+
+        return lhs.size() == rhs.size() && std::equal(lhs.begin(), lhs.end(), rhs.begin(), pred);
+    }
 }