C++桥接模式接口与实现类设计方法

class Implementor {
public:
    virtual ~Implementor() = default;
    virtual void operationImpl() = 0;
};
<p>class Abstraction {
protected:
Implementor<em> impl;
public:
Abstraction(Implementor</em> i) : impl(i) {}
virtual ~Abstraction() = default;
virtual void operation() = 0;
};</p>

class ConcreteImplementorA : public Implementor {
public:
    void operationImpl() override {
        std::cout << "Implementation A\n";
    }
};
<p>class ConcreteImplementorB : public Implementor {
public:
void operationImpl() override {
std::cout << "Implementation B\n";
}
};</p>

class RefinedAbstraction : public Abstraction {
public:
    RefinedAbstraction(Implementor* i) : Abstraction(i) {}
<pre class='brush:php;toolbar:false;'>void operation() override {
    // 可加入前置处理
    impl->operationImpl();
    // 可加入后置处理
}

ConcreteImplementorA implA;
RefinedAbstraction abs(&implA);
abs.operation(); // 输出: Implementation A