访问基本模板中的实例函数指针

Question

我从基础模板类继承，需要覆盖派生模板类中的onConnect方法。如何确保从派生模板实例中覆盖第二个bind中调用的方法？

以下是基本模板类的片段。

class connector()
{ 
 typedef boost::asio::ip::tcp::resolver::iterator resolver_type;

 void start();
 void onConnect(const boost::system::error_code& ec, resolver_type::iterator i);
 void connectCondition(const boost::system::error_code& ec, resolver_type::iterator i);
};
void Connector::start(){
    async_connect(socket, i, 
      boost::bind(&Connector::connectCondition, this,
      boost::asio::placeholders::error,
      boost::asio::placeholders::iterator),
      boost::bind(&Connector::onConnect, this,
      boost::asio::placeholders::error,
      boost::asio::placeholders::iterator));
}
void Connector::connectCondition(const boost::system::error_code& ec, resolver_type::iterator i)
{
  // test connection
}
void Connector::onConnect(const boost::system::error_code& ec, resolver_type::iterator i)
{
  std::cout << "called onConnect from base template class << std::endl; 
}

目前，此代码将始终从基本模板类调用onConnect方法，而不是派生模板类。

class DerivedConnector : public Connector
{
 typedef boost::asio::ip::tcp::resolver::iterator resolver_type;
 //use base connector start method
 void start();
 //override onConnect
 void onConnect(const boost::system::error_code& ec, resolver_type::iterator i);
};

void DerivedConnector::start()
{
  std::cout << "Calling base start method" << std::endl;
  Controller::start();
}
void DerivedConnector::onConnect(const boost::system::error_code& ec, resolver_type::iterator i)
{
  std::cout << "called onConnect from derived template class" << std::endl;
}

我尝试使用this->onConnect无效，因为编译器抱怨函数调用不匹配。