Fix invalid reference bug

1 files changed, 7 insertions, 4 deletions

diff --git a/grammer.cpp b/grammer.cpp
index 9df4703..a54b65d 100644
--- a/grammer.cpp
+++ b/grammer.cpp
@@ -374,7 +374,7 @@ std::map<std::string, std::string> Compiler::traverse(const std::string& lower,
  std::deque<std::pair<std::string, std::string>> todo{{lower, ""}}; // node, child
  
  while (!todo.empty()) {
-  auto& [current_node, current_child] = todo.front();
+  auto [current_node, current_child] = todo.front();
   std::string& current_node2{current_node}; // workaround for lambda capture below (clang 8)
   todo.pop_front();
 
@@ -387,11 +387,13 @@ std::map<std::string, std::string> Compiler::traverse(const std::string& lower,
     
     visited[current_node] = current_child;
     
-    std::for_each(parents.begin(), parents.end(), [&](const auto&x) {todo.emplace_back(x, current_node2);});
+    std::for_each(parents.begin(), parents.end(), [&](const auto&x) {
+     todo.push_back({x, current_node2});
+    });
    }
   }
  }
- 
+
  return visited;
 }
 
@@ -413,8 +415,9 @@ std::vector<std::string> Compiler::GetPath(std::string upper, std::string lower)
    result.push_back(current);
 
    current = child;
-  } else
+  } else {
    return {};
+  }
  }
  return result;
 }