Method is_defined

lib/yamlcpp/include/yaml-cpp/node/detail/node.h:34–34

  const node_ref* ref() const { return m_pRef.get(); }

  bool is_defined() const { return m_pRef->is_defined(); }
  const Mark& mark() const { return m_pRef->mark(); }
  NodeType::value type() const { return m_pRef->type(); }