C++ string.split实现

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 as splitted string. 
Following is the definition of explode (using C++11):

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const vector explode(const string& s, const char& c) { string buff{""}; vector 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:

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

Edit & Run

will produces output:

the quick brown fox

This short article my be useful, hopefully.

转自: http://www.cplusplus.com/articles/2wA0RXSz/