简单接口封装

细节隐藏，对外只透出一个头文件和一个函数！

1. main.cpp

#include 
#include "animal.hpp"

int main()

{
    Animal*cnt_1 =create();
    cnt_1->run();//Tiger is running !!!
    return 0;
}

对外只透出animal.hpp 文件，其他封装，细节隐藏！

2. animal.hpp

#ifndef animal_hpp
#define animal_hpp

#include 
class Animal
{
public:
    virtual void run() = 0;
};

Animal* create();

#endif /* animal_hpp */

---

以下内容编译生成库文件，存在lib文件夹下，不对外透出！

3. animal.cpp

#include "animal.hpp"
#include "tiger.hpp"

Animal* create()
{
    return new Tiger;
}

4. tiger.hpp

#ifndef tiger_hpp
#define tiger_hpp

#include 
#include "animal.hpp"

class Tiger: public Animal
{
    
public:
    void run();
};
#endif /* tiger_hpp */

4. tiger.cpp

#include "tiger.hpp"
#include 

void Tiger::run()
{
        std::cout << "Tiger is running !!!" << std::endl;
}