C++ 智能指针 和 继承多态 的实现

Test.h 头文件

 1 #ifndef TestNameSpace_TestClass
 2 #define TestNameSpace_TestClass
 3 //#define public public:
 4 //#define private private:
 5 //#define protected protected:
 6 
 7 extern "C"
 8 {
 9     namespace TestNameSpace
10     {
11         class Test{
12             public: void Method1();
13             public: void Method2();
14 
15             public: void Method3();
16             protected: virtual void Method4();
17         };
18 
19         class TestA : public Test
20         {
21             void Method4(); 
22         };
23     };
24 };
25 
26 #endif

Test.cpp 函数实现

 1 #include <iostream>
 2 #include "Test.h"
 3 using namespace std;
 4 
 5 void TestNameSpace::Test::Method1()
 6 {
 7     cout<<"Method1"<<endl;
 8 }
 9 
10 void TestNameSpace::Test::Method2()
11 {
12     cout<<"Method2"<<endl;
13 }
14 
15 void TestNameSpace::Test::Method3()
16 {
17     cout<<"Call Method4()"<< endl;
18     this->Method4();
19 }
20 
21 void TestNameSpace::Test::Method4()
22 {
23     cout<<"Method4"<<endl;
24 }
25 
26 
27 
28 
29 void TestNameSpace::TestA::Method4()
30 {
31     cout<<"Method444444444"<<endl;
32 
33 }

Program.cpp 运行调用

 1 #include <iostream>
 2 #include <memory>
 3 #include "Test.h"
 4 using namespace std;
 5 using namespace TestNameSpace;
 6 
 7 int main(){
 8 
 9     cout<<"AAAA"<<endl;
10     
11     shared_ptr<Test> test = std::make_shared<TestA>();
12     test->Method1();
13     test->Method2();
14     test->Method3();
15 
16 
17     Test *test2 = new TestA();
18     test2->Method1();
19     test2->Method2();
20     test2->Method3();
21     delete test2;
22 
23     Test test3;
24     test3.Method1();
25     test3.Method2();
26     test3.Method3();
27 
28     cin.get();
29 };

运行结果：