Question

I am having trouble with what seems like a very simple concept. I have a class like such:

class Projectile
{
public:
    int count;
    int projectiles[1][3];

    Projectile();
    void newProjectile();

};

Projectile::Projectile()
{
    count = 0;
}

void Projectile::newProjectile()
{
    projectiles[0][0] = { 1, 2, 3 };
}

I am trying to set the values inside the projectiles array, and I must be doing this incorrectly. How can I go about dynamically adding a set of values into this property?

Answer 1

 projectiles[0][0] = { 1, 2, 3 };

This isn’t correct. Initializer lists can only given at the point of declaration. You have to assign values independently to each location of the array elements. std::vector<std::vector> twoDimArray; is what you want.

struct foo{

    std::vector<std::vector<int> > twoDimArray;
    void create(int size){

        std::vector<int> oneDimArray(size);
        // vector as of now can just accommodate size number of elements. They aren't
        // assigned any values yet.


        twoDimArray.push_back(oneDimArray); // Copy it to the twoDimArray

        // Now if you wish to increase the size of each row, just push_back element to 
        //  that row. 
        twoDimArray[0].push_back(8);
    }
};