1 files changed, 27 insertions, 0 deletions
diff --git a/utils/hash.h b/utils/hash.h
index e89b1863..b0b1c43e 100755
--- a/utils/hash.h
+++ b/utils/hash.h
@@ -58,4 +58,31 @@ typename H::mapped_type & get_default(H &ht,K const& k,typename H::mapped_type c
   return const_cast<typename H::mapped_type &>(ht.insert(typename H::value_type(k,v)).first->second);
 }
 
+// the below could also return a ref to the mapped max/min.  they have the advantage of not falsely claiming an improvement when an equal value already existed.  otherwise you could just modify the get_default and if equal assume new.
+template <class H,class K>
+bool improve_mapped_max(H &ht,K const& k,typename H::mapped_type const& v) {
+  std::pair<typename H::iterator,bool> inew=ht.insert(typename H::value_type(k,v));
+  if (inew.second) return true;
+  typedef typename H::mapped_type V;
+  V &oldv=const_cast<V&>(inew.first->second);
+  if (oldv<v) {
+    oldv=v;
+    return true;
+  }
+  return false;
+}
+
+template <class H,class K>
+bool improve_mapped_min(H &ht,K const& k,typename H::mapped_type const& v) {
+  std::pair<typename H::iterator,bool> inew=ht.insert(typename H::value_type(k,v));
+  if (inew.second) return true;
+  typedef typename H::mapped_type V;
+  V &oldv=const_cast<V&>(inew.first->second);
+  if (v<oldv) { // the only difference from above
+    oldv=v;
+    return true;
+  }
+  return false;
+}
+
 #endif