need help with overload operator[]

here's the problem.
i was given a test case v[0]=1.
in order to implement operator[],i need to get the access the value it is refering to which is 1.but im not sure how?

Code:

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//initial test code
//replacing item at 0th to be 1

v[0]=1;

//so is it right if i'm assuming = as overload operator?
//wouldn't it makes the test case to be

v.operator[](index).operator=(value);

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but is that right?and how am i suppose to write the signature?

thanks in advance.

You need to provide more context, e.g., what is v?

v is a vector<int> v.
im doing it in class.
i've done most of the part for the function

Code:

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Vector &Vector ::operator [](const unsigned int index);

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but my prob is how can i get the value where the position is assigned to.

like i said before the test case will be v[o]=1 and v is a vector.

Quote:

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Originally Posted by effa

v is a vector<int> v.

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Wait, are you talking about std::vector, or your own vector class template? If it is your own vector class template, then what has that got to do with your Vector class?

Quote:

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Originally Posted by effa

i've done most of the part for the function

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You should be aware that that means that given a non-const Vector object vec, vec[0] returns a reference to a Vector...

Quote:

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Originally Posted by effa

but my prob is how can i get the value where the position is assigned to.

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... if so, then you presumably would have operator= overloaded for your Vector class such that it can take an int argument, or you have a constructor that can convert an int to a Vector implicitly.

I'm quite sure you need to return a reference to that item in the Vector, not the Vector itself.

Code:

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Vector &Vector ::operator =(const Vector &num);

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doesnt the argument for the operator = have to be a Vector& not an int.
i tried to use pointer but it didnt work.

i also even tried to create a new function for v[0]=1 and make *edit as a private member function so that the function for operator[] will take the value that it is assign for.

Code:

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Vector &Vector ::operator =(const int &num){

        *edit= num;

        return *edit;
}

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could you please explain where did i do wrong here?

Quote:

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Originally Posted by effa

doesnt the argument for the operator = have to be a Vector& not an int.

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If the parameter for operator= is a (const) reference to a Vector, then that operator= is a copy assignment operator. However, that does not restrict you from overloading operator= to take arguments of other types, such as int.

That said, anon stated what I was trying to hint at: that you might want to check if the return type of your operator[] is correct.

urgh dont quite understand what anon trying ti say there

Quote:

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return a reference to that item in the Vector, not the Vector itself

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mind to explain to me how this works? really confuse now. =_=

and what do you mean with the return type must be correct.what i did for the function operator[ ] is returning a list of int that is being modified after the v[0]=1.

Suppose your vector contains values of type T, then the [] operator must return a reference to T and not the Vector class itself.

what do you get when you use the [] operator with the stl vector ?

eg:

Code:

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vector<T> vec(100);
T val = vec[0];

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so, your's should act the same way too.