the whole game

src/util/CollectionUtils.h

@@ -0,0 +1,17 @@
+#ifndef COLLECTIONUTILS_H__
+#define COLLECTIONUTILS_H__
+
+struct PairKeyFunctor {
+    template <typename T>
+    typename T::first_type operator()(T& pair) const {
+        return pair.first;
+    }
+};
+struct PairValueFunctor {
+    template <typename T>
+    typename T::second_type operator()(T& pair) const {
+        return pair.second;
+    }
+};
+
+#endif /*COLLECTIONUTILS_H__*/