class std::vector has no member named [closed]

Answer 1

You are creating an array of four vectors, not a vector with four elements.

In your code, coffee_vec[1] refers to a vector<coffeeBean> object, not a coffeeBean object.

Answer 2

with coffe_vec[1] you are not accessing an instance of coffeBean but an instance of std::vector<coffeBean> because coffe_vec is an array of vectors. If you want to access coffeBean elements you need to call for example coffe_vec[1][0] which wouldn't be good in your case because all vectors in your array are empty.

Maybe you wanted to create a vector with 4 elements, that would look like that:

std::vector<coffeBean> coffe_vec(4);

or use { }

Answer 3

a vector can push and pop objects as it can with built-in data.

if we create only one vector we can push in it datta:

std::vector<int> vecInt;    // vector of integers
std::vector<int> vecInt[4]; // an array of vectors to integers

so the array of vectors is like a multi-dimensional array. so to access the data we double the subscript operator `[][]`:

vecInt[0].push_back(5);
cout << vecInt[0][0]; // the first for first vector in the array and the second index is for the first data in the first vector in the array.

in your example you have an array to vectors to struct coffeebeen:

std::vector<coffeeBean> coffee_vec[4];

int main(int argc, char ** argv)
{

    coffeeBean cofB = { "Raindrop7", "England", 5 };
    coffee_vec[0].push_back(cofB); // push the object in the first vector in the array

    cout << (coffee_vec[0][0]).name  << endl;


    cin.get();
    return 0;
}