How to determine the shape when a C++ function returns a multidimensional array?

To determine the shape of a multidimensional array returned by a C function, use the following steps: Use size() to determine the number of rows in the array. Use shape()[0] or arr[0].size() to determine the number of columns in the array.

Use the Size-Shape attribute to determine the shape of a multidimensional array returned by a C function

When returning a multidimensional array from a C function, it is required Determine the shape of the array so that array elements can be processed correctly. Here's how to determine the shape using the size() and shape() methods:

#include <iostream>
#include <vector>

using namespace std;

vector<vector<int>> create_2d_array(int rows, int cols) {
  vector<vector<int>> arr(rows, vector<int>(cols));
  return arr;
}

int main() {
  // 创建一个 3x4 的二维数组
  vector<vector<int>> arr = create_2d_array(3, 4);

  // 获取数组的形状
  int rows = arr.size();
  int cols = arr[0].size();

  // 访问数组元素
  for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
      cout << arr[i][j] << " ";
    }
    cout << endl;
  }

  return 0;
}

Output:

0 0 0 0
0 0 0 0
0 0 0 0

In this example, the create_2d_array function Returns a 3x4 two-dimensional array. The size() and shape() methods are used to determine the shape of the array so that array elements can be accessed correctly.

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