在C++中实现python np.fromstring()

#include <iostream>
#include <vector>
#include <string>
#include <sstream>

std::vector<double> fromString(const std::string& str) {
    std::vector<double> result;
    std::stringstream ss(str);
    std::string token;
    while (std::getline(ss, token, ' ')) {
        result.push_back(std::stod(token));
    }
    return result;
}

int main() {
    std::string input = "1.0 2.0 3.0 4.0 5.0";
    std::vector<double> output = fromString(input);
    
    for (double value : output) {
        std::cout << value << " ";
    }
    
    return 0;
}