virtual1.cpp

#include < iostream >
#include < string >
#include < cstring >
class Sample1 {
public:
    virtual void vMethod1() {
        printf("This is virtual method 1\n");
        printf("Sample1: member1 = %d\n", member1);
    }
    virtual void vMethod2() {
        printf("Sample1: This is virtual method 2\n");    
    }
    void method2() {
        printf("This is NONVIRTUAL method 2\n");    
    }
public:
    int     member1;
    int     member2;
};

class  Sample2: public Sample1 {
public:

    //override vMethod1()
    virtual void vMethod1() {
        printf("Sample2: This is virtual method 1\n");
    }
    virtual void vMethod3() {
        printf("Sample2: This is virtual method 3\n");
    }
};


//Define method type
//Thêm tham số thisPtr ở đây
typedef void (*MyFunc)(Sample1 *thisPtr);

int main(int argc, const char * argv[]) {
    Sample1 *a = new Sample1();
        
    MyFunc *virtualMethodTable = (MyFunc*)(*(MyFunc*)a);    
    Sample2 *b = new Sample2();    
    
    MyFunc* virtualMethodTable2;
    memcpy(&virtualMethodTable2, b, 8);
    
        
    printf("\n\n");
    printf("Sample1 - vMethod1 Addr: %p\n", virtualMethodTable[0]);
    printf("Sample1 - vMethod2 Addr: %p\n", virtualMethodTable[1]);
    
    printf("--------------------------------\n");
    printf("Sample2 - vMethod1 Addr: %p\n", virtualMethodTable2[0]);
    printf("Sample2 - vMethod2 Addr: %p\n", virtualMethodTable2[1]);
        
    return 0;
}