c++将vector<pair<double，double>>转换为double*，double*？

#include <iostream>
#include <vector>

double* convertVectorToDoubleArray(const std::vector<std::pair<double, double>>& vec) {
    int size = vec.size();
    double* arr = new double[size * 2];

    for (int i = 0; i < size; i++) {
        arr[i * 2] = vec[i].first;
        arr[i * 2 + 1] = vec[i].second;
    }

    return arr;
}

int main() {
    std::vector<std::pair<double, double>> vec = {{1.1, 2.2}, {3.3, 4.4}, {5.5, 6.6}};

    double* arr = convertVectorToDoubleArray(vec);

    // 打印转换后的数组
    int size = vec.size() * 2;
    for (int i = 0; i < size; i++) {
        std::cout << arr[i] << " ";
    }
    std::cout << std::endl;

    delete[] arr;

    return 0;
}