Either
orCode:const std::string &str() const { return m_str; }
Will give error: cannot convert from 'const std::string' to 'std::string &'Code:std::string &str() const { return m_str; }
Either
orCode:const std::string &str() const { return m_str; }
Will give error: cannot convert from 'const std::string' to 'std::string &'Code:std::string &str() const { return m_str; }