How do I remove an element from the vector?

Question

So I have to write my own method.

I did the following:

vector<float> remove(vector<float>& sortedVector, float input)
{

    for (vector<float>::iterator it = sortedVector.begin() ; it != sortedVector.end(); ++it)
    {
        if(input == *it)
        {
            sortedVector.erase(it);
        }
    }

    return sortedVector;
}

However compiler breaks at for loop. Where did I go wrong? I need to return the modified vector after the given value of the user is removed from the vector.

Output of the error

instead of making your own function just use the [erase and remove idiom](https://en.wikipedia.org/wiki/Erase%E2%80%93remove_idiom) — NathanOliver, Feb 29 '16 at 21:13
@NathanOliver Because he says "i have to write my own method", this is probably for a course or something. — Colin Basnett, Feb 29 '16 at 21:14
The compiler breaks? What compiler are you using that suffers an _internal error_ with something this simple? — Weak to Enuma Elish, Feb 29 '16 at 21:15
After `erase(it)` the iterator is invalid and `++it` is undefined. — Bo Persson, Feb 29 '16 at 21:16
Returning a copy of a vector passed into the function by reference? That cannot be right. — Christian Hackl, Feb 29 '16 at 21:18
@ChristianHackl fairly new to both vector and by reference. I need to remove an element user wants to remove then update the original vector. — Bayazid, Feb 29 '16 at 21:27
@Bayazid Seriously, if you showed up at a job interview with your own function to erase from a vector, it would not be looked upon highly by the interviewer. Who is teaching your class? — PaulMcKenzie, Feb 29 '16 at 21:38

score 0 · Answer 1 · answered Feb 29 '16 at 21:15

0

Why make your own function? You can simply do this:

vector.erase(std::remove(vector.begin(), vector.end(), item_to_delete ), vector.end());

answered Feb 29 '16 at 21:15

Marinos K

1,779
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39

I'm required to write my own function. – Bayazid Feb 29 '16 at 21:26
1

@Bayazid Your requirements didn't state you had to write a `for` loop, only that you had to write a function. That function could have inside of it the call to `erase / remove`. – PaulMcKenzie Feb 29 '16 at 21:44
exactly.. you can wrap my code in you function and that's it.. and if you prefer something more verbose - check the actual implementation of these algorithms to devise your own version. – Marinos K Feb 29 '16 at 21:46
*"I have to write my own method"* is synonymous for *"cannot use a library"*. Providing a solution that wraps a library call in a function does not meet that requirement. You cannot possibly be **this** dense. Suggesting to study the implementation (likely incomprehensible, even to somewhat experienced developers) is like saying RTFM. -1 for the undue arrogance alone. – IInspectable Mar 01 '16 at 02:04
"I have to write my own method" is NOT synonymous for "cannot use a library". – Marinos K Mar 01 '16 at 05:37

How do I remove an element from the vector?

1 Answers1