在C ++中分割字符串？ [英] Split a string in C++?

问题描述

在C ++中分割字符串最优雅的方法是什么？字符串可以假定为由以空格分隔的单词组成。

What's the most elegant way to split a string in C++? The string can be assumed to be composed of words separated by whitespace.

（注意，我对C字符串函数或那种字符操作/访问不感兴趣。 ）

(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 sub;
        iss >> sub;
        cout << "Substring: " << sub << endl;
    } while (iss);
}

推荐答案

另一种从输入字符串中提取令牌的方法，只依赖于标准库设施。这是STL设计背后的力量和优雅的例子。

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, "\n"));
}

而不是将提取的令牌复制到输出流，一个容器，使用相同的通用 copy 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));

...或直接创建向量 ：

... or create the vector directly:

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

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