Facade Pattern

1.Facade 模式在高层组合封装了子系统的接口，解耦了系统。隐藏了子系统的复杂性，使其更易使用。

2.Facade 模式结构图

3.实现

#ifndef _FACADE_H_
#define _FACADE_H_ 

class Subsystem1
{
public:
    Subsystem1();
    ~Subsystem1();
    void Operation();
protected: 
private:
};

class Subsystem2
{
public:
    Subsystem2();
    ~Subsystem2();
    void Operation(); 
protected: 
private:
};

class Facade
{
public:
    Facade();
    ~Facade();
    void OperationWrapper(); 
protected:
private:
    Subsystem1* _subs1;
    Subsystem2* _subs2;
};

#endif

#include "Facade.h" 
#include <iostream>
using namespace std; 

Subsystem1::Subsystem1()
{

} 

Subsystem1::~Subsystem1()
{

} 

void Subsystem1::Operation()
{
    cout<<"Subsystem1 operation.."<<endl;
}

Subsystem2::Subsystem2()
{

} 

Subsystem2::~Subsystem2()
{

} 

void Subsystem2::Operation()
{
    cout<<"Subsystem2 operation.."<<endl;
} 

Facade::Facade()
{
    this->_subs1 = new Subsystem1();
    this->_subs2 = new Subsystem2();
}

Facade::~Facade()
{
    delete _subs1;
    delete _subs2;
}

void Facade::OperationWrapper()
{
    this->_subs1->Operation();
    this->_subs2->Operation();
}

#include "Facade.h" 
#include <iostream>
using namespace std; 

int main(int argc,char* argv[])
{
    Facade* f = new Facade();
    f->OperationWrapper(); 
    return 0;
}