CODEWITHSUNDEEP
c++vector
John B
John B

Reputation: 95

How do you remove a vector? c++

I currently have a zombies project that I've been given for uni but I'm stuck on a couple of things.

How to properly remove a vector? We have zombies and pill objects that are stored in vectors. My first thought was to change the symbol but obviously that doesn't work since that's all I was changing like this:

for (int i = 0; i < MAXPILLS; i++)
{
    //if pill coordinates = spot coordinates
    if ((pills.at(i).y == sp.y) && (pills.at(i).x == sp.x))
    {
        pills.at(i).symbol = TUNNEL;    //make pill a tunnel
    }
}

This pill object needs to be completely removed instead. I have to do this also for when a zombie falls down a hole (sp is an instance of the zombie class).

How can I remove it all together?

Upvotes: 0

Views: 94

Answers (1)

hynner
hynner

Reputation: 1352

Use remove_if algorithm instead:

pills.erase(std::remove_if(pills.begin(), pills.end(), [&sp](const decltype(pills.at(0)) &p){return p.x == sp.x && p.y == sp.y;}));

Note that I'm using lambda function here which is C++11 construct so you might want to check whether you're allowed to use that in your assignment first and replace it with functor object if you're not allowed to use C++11.

Upvotes: 2

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