Can i push an array of int to a C++ vector?

Question

Is there any problem with my code ?

std::vector weights;
int weight[2] = {1,2};
weights.push_back(weight);

It can\'t be compi

Answer 1

To instantiate the vector, you need to supply a type, but int[2] is not a type, it's a declaration.

Answer 2

Arrays aren't copy constructable so you can't store them in containers (vector in this case). You can store a nested vector or in C++11 a std::array.

Answer 3

Just use

vector<int*>  .That will definitely work.

A relevant discussion on the same topic : Pushing an array into a vector

Answer 4

You cant do that simply.

It's better you use either of these:

1. vector <vector<int>> (it's basically a two dimensional vector.It should work in your case)

2. vector< string > (string is an array of characters ,so you require a type cast later.It can be easily.).

3. you can declare an structure (say S) having array of int type within it i.e.

   struct S{int a[num]} ,then declare vector of vector< S>

So indirectly, you are pushing array into a vector.

Answer 5

Array can be added to container like this too.

    int arr[] = {16,2,77,29};
    std::vector<int> myvec (arr, arr + sizeof(arr) / sizeof(int) );

Hope this helps someone.

Answer 6

One possible solution is:

    std::vector<int*> weights;
    int* weight = new int[2];
    weight[0] =1; weight[1] =2;
    weights.push_back(weight);