Segmentation Fault when returning an object field from a function

Asked May 27 '21 at 10:56

Active Jun 01 '21 at 06:26

Viewed 287 times

I am getting segmentation fault when I am returning l-value or r-value reference of object field from a function. Can anyone please explain me? I have included the code that I wrote.

int randomItem1(const vector<IntCell>& x) { // works fine
    return x[0].read();

The code above works fine. However, the following code gives me segmentation fault.

const int& randomItem2(const vector<IntCell>& x) { // segmentation fault
    return x[0].read();

int&& randomItem3(const vector<IntCell>& x) { // segmentation fault
    return x[0].read();

IntCell class definition:

class IntCell {
private:
    int storedValue;
public:
    IntCell(int val):storedVal{val} {}
    int read() const {
        return storedVal;
    }
};

Edit: I have included the class definition for IntCell.

edited May 28 '21 at 01:25

asked May 27 '21 at 10:56

Mahfuzur Rahman

Ask yourself: you're a returning a reference to *what*? What does `read()` return? – Evg May 27 '21 at 10:57
when you return a reference or pointer, you have to make sure it lives, when you dereference it – Unlikus May 27 '21 at 10:58
1

if `read` returns a reference your code should be fine, if it returns a value then there is a duplicate. What is `read` ? – 463035818_is_not_an_ai May 27 '21 at 10:58
maybe related: https://stackoverflow.com/questions/6441218/can-a-local-variables-memory-be-accessed-outside-its-scope?rq=1 – 463035818_is_not_an_ai May 27 '21 at 10:59
4

Show the `IntCell::read` definition. Better yet, make a [mre]. – Ted Lyngmo May 27 '21 at 11:02
1

Please post a [mcve]. – Richard Critten May 27 '21 at 11:05
Sorry, I have included the definition of my IntCell class. – Mahfuzur Rahman May 28 '21 at 01:03

Segmentation Fault when returning an object field from a function

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