可以这样

#include <iostream>
#include <sstream>
#include <string>
int main()
{
    std::string s("Somewhere down the road");
    std::istringstream iss(s);
    do
    {
        std::string sub;
        iss >> sub;
        std::cout << "Substring: " << sub << std::endl;
    } while (iss);
}

也可以这样：

#include <iostream>
#include <string>
#include <sstream>
#include <algorithm>
#include <iterator>
int main() {
    using namespace std;
    string sentence = "And I feel fine...";
    istringstream iss(sentence);
    copy(istream_iterator<string>(iss),
         istream_iterator<string>(),
         ostream_iterator<string>(cout, "\n"));
}

上面的代码如果不想输出到控制台，也可以将结果存到容器里：

vector<string> tokens;
copy(istream_iterator<string>(iss),
     istream_iterator<string>(),
     back_inserter(tokens));

或者直接创建vector:

vector<string> tokens{istream_iterator<string>{iss},
                      istream_iterator<string>{}};