适配器模式1

class Current18v
{
public:
    virtual void useCurrent18v() = 0;
};

class Current220v
{
public:
    void useCurrent220v()
    {
        std::cout << "220v,欢迎使用." << std::endl;
    }
};

class Adapter : public Current18v
{
public:
    Adapter(Current220v* current)
    {
        m_current = current;
    }

    virtual void useCurrent18v()
    {
        m_current->useCurrent220v();
    }
private:
    Current220v *m_current;
};