【设计模式攻略】创建型模式之Abstract Factory模式

class AbstractAmplifierIn {};
class AbstractAmplifierOut {};

class Amplifer1_In : public AbstractAmplifierIn {};
class Amplifer2_In : public AbstractAmplifierIn {};
class Amplifer1_Out : public AbstractAmplifierOut {};
class Amplifer2_Out : public AbstractAmplifierOut {};

class AbstractFactory {
public:
     virtual AbstractAmplifierIn* create_amplifier_in() = 0;
     virtual AbstractAmplifierOut* create_amplifier_out() = 0;
};

class AmplifierFactory1 : public AbstractFactory {
public:
     AbstractAmplifierIn* create_amplifier_in() {
          return new Amplifer1_In;
     }
     AbstractAmplifierOut* create_amplifier_out() {
          return new Amplifer1_Out;
     }
};

class AmplifierFactory2 : public AbstractFactory {
public:
     AbstractAmplifierIn* create_amplifier_in() {
          return new Amplifer2_In;
     }
     AbstractAmplifierOut* create_amplifier_out() {
          return new Amplifer2_Out;
     }
};

AbstractFactory* factory = new AmplifierFactory1;
AbstractAmplifierIn* amp_in = factory->create_amplifier_in();
AbstractAmplifierOut* amp_out = factory->create_amplifier_out();