如何迭代字符串的单词? [英] How do I iterate over the words of a string?

问题描述

我正在尝试遍历字符串中的单词.

I'm trying to iterate over the words of a string.

可以假设字符串由空格分隔的单词组成.

The string can be assumed to be composed of words separated by whitespace.

请注意，我对 C 字符串函数或那种字符操作/访问不感兴趣.另外，请在您的回答中优先考虑优雅而不是效率.

Note that I'm not interested in C string functions or that kind of character manipulation/access. Also, please give precedence to elegance over efficiency in your answer.

我现在最好的解决方案是:

The best solution I have right now is:

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

using namespace std;

int main()
{
    string s = "Somewhere down the road";
    istringstream iss(s);

    do
    {
        string subs;
        iss >> subs;
        cout << "Substring: " << subs << endl;
    } while (iss);
}

有没有更优雅的方法来做到这一点?

Is there a more elegant way to do this?

推荐答案

值得一提的是，这是另一种从输入字符串中提取标记的方法，它仅依赖于标准库工具.这是 STL 设计背后的力量和优雅的一个例子.

For what it's worth, here's another way to extract tokens from an input string, relying only on standard library facilities. It's an example of the power and elegance behind the design of the STL.

#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, "
"));
}

可以使用相同的通用 复制算法.

Instead of copying the extracted tokens to an output stream, one could insert them into a container, using the same generic copy algorithm.

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>{}};

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