正确理解C sharp中的ref关键字(2)

// ----------------------------------------

// MyClass definition

#pragma once



class MyClass

{

public:

int Value;

};



typedef MyClass* MyClassPtr; 



// ----------------------------------------

// Tester methods

void TestRef(char* i)

{

*i = 'b';

}



void TestNoRef(char i)

{

i = 'c';

}



void TestRef(MyClassPtr* m)

{

(*m)->Value = 10;

}



void TestNoRef(MyClassPtr m)

{

m->Value = 20;

}



void TestCreateRef(MyClassPtr* m)

{

delete (*m);

*m = new MyClass();

(*m)->Value = 100;

}



void TestCreateNoRef(MyClassPtr m)

{

m = new MyClass();

m->Value = 200;

}



int main(int argc, char* argv[])

{

char c = 'a';



TestRef(&c);

printf("%c\n", c);  // output: b

TestNoRef(c);

printf("%c\n", c);  // output: b



MyClassPtr m = new MyClass;

m->Value = 1;



TestRef(&m); 

printf("%d\n", m->Value);



TestNoRef(m); 

printf("%d\n", m->Value);



TestCreateRef(&m); 

printf("%d\n", m->Value);



TestCreateNoRef(m);

printf("%d\n", m->Value);



delete m;



return 0;

}

10

20

100

100