将字符串拆分为C ++中的数组 [英] Split a string into an array in C++

问题描述

可能重复：

如何在C ++中拆分字符串？

Possible Duplicate:
How to split a string in C++?

我有一个数据的输入文件，每行是一个条目。在每行中，每个字段由空格分隔，因此我需要按空格拆分。其他语言有一个称为split（C＃，PHP等）的功能，但我不能找到一个为C ++。我该如何实现呢？这是我的代码，获得行：

I have an input file of data and each line is an entry. in each line each "field" is seperated by a white space " " so I need to split the line by space. other languages have a function called split (C#, PHP etc) but I cant find one for C++. How can I achieve this? Here is my code that gets the lines:

string line;
ifstream in(file);

while(getline(in, line)){

  // Here I would like to split each line and put them into an array

}

推荐答案

#include <sstream>  //for std::istringstream
#include <iterator> //for std::istream_iterator
#include <vector>   //for std::vector

while(std::getline(in, line))
{
    std::istringstream ss(line);
    std::istream_iterator<std::string> begin(ss), end;

    //putting all the tokens in the vector
    std::vector<std::string> arrayTokens(begin, end); 

    //arrayTokens is containing all the tokens - use it!
}

顺便说一下，使用 std :: getline ， std :: ifstream 。看起来你在代码中的某处使用命名空间std 写了这被认为是一种坏习惯。所以不要这样做：

By the way, use qualified-names such as std::getline, std::ifstream like I did. It seems you've written using namespace std somewhere in your code which is considered a bad practice. So don't do that:

• Why is 'using namespace std;' considered a bad practice in C++?

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