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App调用接口，依赖头文件和库。

库文件更新，App代码不需要重新编译，直接就可以运行。

//main.cpp

//main.cpp

#include "IStudent.h"

int main(){

getIStudent()->TellStory();

}

//IStudent.h
//#pragma once
#ifndef IS_H
#define IS_H
#include <iostream>

class IStudent {

public:
    IStudent(){}
    virtual ~IStudent(){}
    virtual void TellStory() = 0;

};
  IStudent*  getIStudent();
 void test();
#endif

//Student.h
//#pragma once
#ifndef S_H
#define S_H

#include "IStudent.h"
#include <iostream>

class Student: public IStudent
{
private:
    /* data */
public:
    Student(/* args */);
    ~Student();
    void TellStory();
};

 #endif

//Student.cpp
#include "Student.h"
#include <iostream>

void Student::TellStory(){
    std::cout<<"hello world"<<std::endl;
 }

Student::Student(/* args */)
{
}

Student::~Student()
{
}

void test(){std::cout<<"ss222ss"<<std::endl;}

 IStudent*  getIStudent(){
    IStudent* I = new Student();
    return I;
 }

CMakeLists.txt

cmake_minimum_required(VERSION 3.5)
project(student)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

add_library(Istudent SHARED Student.cpp)

#set(SOURCE_FILES main.cpp)
#add_executable(student ${SOURCE_FILES})

#target_link_libraries(student Istudent)

先全编译，生成库和可执行程序。

然后不需要再编译可执行程序了，修改Student.cpp 的打印。编译生成新的库文件

运行可执行程序。可执行程序可以打印新的更改。