Passing member names to functions

While doing my labs, I need to write or modify similar codes over and over again (such as sorting objects or modifying their attributes’ values).

My problem is: Is there a solution to input the name of the member so that I can simply paste it it when I need it to process different classes or structs?

Luckily, I found two solutions. This one calls the function offsetof() to get the offset of the member. It works well when I use struct but shows warning when I use class. This one uses template but you have to know the name of member before compilation.

Here I put the code below:

offsetof() solution:

struct Test
{
    int x;
    int y;
};

void example(void *base, size_t offset)
{
    int *adr;
    adr = (int*)((char*)base + offset);
    printf("%d\n", *adr);
}

int main(int argc, char **argv)
{
    struct Test t;

    t.x = 5;
    t.y = 10;

    example(&t, offsetof(struct Test, y));
}

template solution:

template <typename ObjType, typename MembType>
void myOutput(ObjType* obj, MembType memb)
{
    std::cout << obj->*memb << std::endl;
}