const & parameter

ml.cpp

@@ -644,7 +644,7 @@ std::ostream &operator<<(std::ostream &os, MlEnvironment const &e) {
 	return os << "}";
 }
 
-void MlEnvironment::set(std::string name, MlValue value) {
+void MlEnvironment::set(const std::string &name, MlValue value) {
 	defs[name] = value;
 }
 

ml.h

@@ -28,7 +28,7 @@ public:
     MlValue get(const std::string &name) const;
 
     // Set the value associated with this name in this scope
-    void set(std::string name, MlValue value);
+    void set(const std::string &name, MlValue value);
 
     void combine(MlEnvironment const &other);