C ++，带矢量 <int[2]> 我可以push_back（{someNum1，someNum2}）吗？

Question

I have the vector:

vector<int[2]> storeInventory; //storeInventory[INDEX#]{ITEMNUM, QUANTITY}

and I am wanting to use the push_back() method to add new arrays to the inventory vector. Something similar to this:

const int ORANGE = 100001;
const int GRAPE = 100002

storeInventory.push_back({GRAPE,24});
storeInventory.push_back{ORANGE, 30};

However, when I try using the syntax as I have above I get the error Error: excpeted an expression . Is what I am trying just not possible, or am I just going about it the wrong way?

Answer 1

Built-in arrays are not Assignable or CopyConstructible . This violates container element requirements (at least for C++03 and earlier). In other words, you can't have std::vector of int[2] elements. You have to wrap your array type to satisfy the above requirements.

As it has already been suggested, std::array in a perfect candidate for a wrapper type in C++11. Or you can just do

struct Int2 {
  int a[2];
};

and use std::vector<Int2> .

Answer 2

If it's only vector of int[2] you could use:

std::vector<std::pair<int, int>> vec

Adding elements:

int a, b;
vec.push_back(std::make_pair(a, b));

Answer 3

storeInventory.push_back({GRAPE, 24});
storeInventory.push_back({ORANGE, 30}); 

You can try this. I think you forgot parentheses.

Answer 4

I don't believe it's possible to pass arrays like that. Consider using std::array instead:

vector<std::array<int, 2> > storeInventory; 
storeInventory.push_back({{GRAPE,24}});

Answer 5

C样式数组不可复制，因此不能用作std::vector的元素类型。

Answer 6

只需使用std::vector<int *> :)