Return Graph by const reference

2 files changed, 2 insertions, 2 deletions

diff --git a/src/brandes.cc b/src/brandes.cc
index 7c7d529..809ccd4 100644
--- a/src/brandes.cc
+++ b/src/brandes.cc
@@ -18,7 +18,7 @@ int main(int argc, char *argv[]) {
 
     Parser parser(input_file);
 
-    Graph graph = parser.get_graph();
+    const Graph &graph = parser.get_graph();
 
     return 0;
 }
diff --git a/src/parse.h b/src/parse.h
index 3f86eec..ec86302 100644
--- a/src/parse.h
+++ b/src/parse.h
@@ -15,7 +15,7 @@ public:
         }
     }
 
-    Graph get_graph() {
+    const Graph & get_graph() {
         return graph_;
     }
 private: