参考答案

class BaseTerminal {
public:
 virtual void PrintLog(const string& message) const = 0;
};

class Screen: public BaseTerminal {
public:
 void PrintLog(const string& message) const = 0;
};

class Network: public BaseTerminal {
public:
 void PrintLog(const string& message) const = 0;
};

void LogPrint(const BaseTerminal &terminal);