visitor.h:8:  public: should be indented +1 space inside class DataClass  [whitespace/indent] [3]
visitor.h:16:  public: should be indented +1 space inside class BfsVisitor  [whitespace/indent] [3]
visitor.h:25:  An else should appear on the same line as the preceding }  [whitespace/newline] [4]
visitor.h:25:  If an else has a brace on one side, it should have it on both  [readability/braces] [5]
visitor.h:41:  private: should be indented +1 space inside class BfsVisitor  [whitespace/indent] [3]
Done processing visitor.h
Total errors found: 5