anyone help me on usage of this

hi all~

Below is the description of keyword this on my book:

this points to the invokinig object and *this is the invoking object itself

with these marks this and *this are the same ? anyone could explain differnece between them ? thanx !!!

Try this:)
http://newdata.box.sk/bx/c/htm/ch08.htm#Heading36

thanx did that mean if we can reference a member like this: this->someMember then we can reference it with this way too: *this.someMember ?

i think *this will do same affect but my compiler still report an error when i try to do that ??? here is my code:

Code:

---

#include <iostream>

class Test
{
        public:
                int n;
                Test() { n = 0; };
                Test(int m) { n = m; };
                int getInt() { return *this.n; };    // Error ???
};
int main()
{
        Test t1(9);
        std::cout << t1.getInt();
}

---

any ideas ?

Code:

---

#include <iostream>

class Test
{
        public:
                int n;
                Test() { n = 0; };
                Test(int m) { n = m; };
                int getInt() { return (*this).n; }; // it's a pointer
                //int getInt() { return this->n; }; // this works also
};
int main()
{
        Test t1(9);
        std::cout << t1.getInt();
}

---

Just some hints:
- don't missuse the this pointer (as you actually do); it's not meant for such purposes, rather for self-checking (e.g. in the case of user-defined "operator =")
- understand the meaning of dereference operator *

If you have a pointer, say:

Code:

---

int i = 5;
int* ptr = &i;

---

whereas the pointer ptr has the address of i, you can access i also through the ptr pointerusing the dereference operator. Following lines will display the same value (5):

Code:

---

cout << i << endl;
cout << *ptr << endl;

---

Quote:

---

Originally Posted by Carlos

Just some hints:
- don't missuse the this pointer (as you actually do); it's not meant for such purposes, rather for self-checking (e.g. in the case of user-defined "operator =")

---

Do you have an example?

Code:

---

someClass& someClass::operator=(const someClass & rhs)
{
  if (this==&rhs)
    return *this;

//...
}

---

thanx guys ! i think i got it ! :D