rewrite scope implementation

 * now there are not extra unused hash tables
 * each variable declaration opens a new scope inside a function

1 files changed, 9 insertions, 0 deletions

diff --git a/src/hash_map.hpp b/src/hash_map.hpp
index 9c9939e4cc..51ec352eda 100644
--- a/src/hash_map.hpp
+++ b/src/hash_map.hpp
@@ -61,6 +61,15 @@ public:
         }
     }
 
+    Entry *put_unique(const K &key, const V &value) {
+        // TODO make this more efficient
+        Entry *entry = internal_get(key);
+        if (entry)
+            return entry;
+        put(key, value);
+        return nullptr;
+    }
+
     const V &get(const K &key) const {
         Entry *entry = internal_get(key);
         if (!entry)