C++ string.split实现

最新推荐文章于 2024-03-20 22:05:09 发布

转载最新推荐文章于 2024-03-20 22:05:09 发布 · 819 阅读

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本文介绍了一个简单的 C++ 函数，该函数模仿 PHP 中的 explode() 函数来按指定的分隔符拆分字符串。文章提供了完整的代码示例及运行效果。

Split a String

In this short article I want to share a short code about splitting a string like in PHP programming language. As we know in PHP there is a function called explode() to split a string by given delimiter (as single char or substring). For example, given a string str = "the quick brown fox" will be splitted by " " (space char). Simply we just call explode(str, " ") and the functions returns array of string {"the", "quick", "brown", "fox"}.

We can write a "PHP explode()"-like using C++, though the given delimiter is limited to a single char only. Our version of explode() returns std::vector<string> as splitted string.
Following is the definition of explode (using C++11):

const vector<string> explode(const string& s, const char& c)
{
	string buff{""};
	vector<string> v;
	
	for(auto n:s)
	{
		if(n != c) buff+=n; else
		if(n == c && buff != "") { v.push_back(buff); buff = ""; }
	}
	if(buff != "") v.push_back(buff);
	
	return v;
}

The code above just a simple function, yet well-tested with various case. Following is the example in main function:

int main()
{
	string str{"the quick brown fox jumps over the lazy dog"};
	vector<string> v{explode(str, ' ')};
	for(auto n:v) cout << n << endl;
	
	return 0;
}

Edit & Run

will produces output: