在c ++中用空格分隔字符串 [英] Splitting a string by whitespace in c++

问题描述

可能的重复项：

C ++：如何拆分字符串？

拆分字符串

分割字符串的最佳方法是什么在C ++中的空格？

What is the best way to go about splitting a string up by whitespace in c++?

我想根据tab，空格等来分割，当然忽略多个制表符/空格等。

I'd like to be able to split it based on tab, space, etc. and of course ignore multiple tabs/spaces/etc. in a row as well as not have issues with having those things at the end.

最后，我将最终存储在一个向量中，但我可以很容易地

Ultimately, I am going to end up storing this in a vector, but I can easily convert between data types if there is some easy built-in standard library way of splitting.

我在一个UNIX机器上使用g ++，不是

I am building this on a UNIX machine with g++, not using Microsoft Visual C++

推荐答案

这可能是开放的问题是否最好真正的 easy 方法是将你的字符串放入一个字符串流，然后读取数据：

It may be open to question whether it's best, but one really easy way to do this is to put your string into a stringstream, then read the data back out:

// warning: untested code.
std::vector<std::string> split(std::string const &input) { 
    std::istringstream buffer(input);
    std::vector<std::string> ret;

    std::copy(std::istream_iterator<std::string>(buffer), 
              std::istream_iterator<std::string>(),
              std::back_inserter(ret));
    return ret;
}

如果您愿意，可以初始化 / code>直接来自迭代器：

If you prefer, you can initialize the vector directly from the iterators:

std::vector<std::string> split(std::string const &input) { 
    std::istringstream buffer(input);
    std::vector<std::string> ret((std::istream_iterator<std::string>(buffer)), 
                                 std::istream_iterator<std::string>());
    return ret;
}

应该使用任何合理的C ++编译器。使用C ++ 11，您可以使用括号初始化来清除第二个版本：

Either should work with any reasonable C++ compiler. With C++11, you can clean up the second version a little bit by using brace-initialization instead:

    std::vector<std::string> ret{std::istream_iterator<std::string>(buffer), 
                                 std::istream_iterator<std::string>()};

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