C++的split函數

C++ STL中沒有類似Perl的split函數，必須自己寫一個。下面是從網上（http://stackoverflow.com/questions/236129/c-how-to-split-a-string）      

轉帖的代碼及使用方法，還是挺管用的。另外，C的strtok()函數也可以實作類似功能。      

void Tokenize(const string& str,
                      vector<string>& tokens,
                      const string& delimiters = " ")
{
    // Skip delimiters at beginning.
    string::size_type lastPos = str.find_first_not_of(delimiters, 0);
    // Find first "non-delimiter".
    string::size_type pos     = str.find_first_of(delimiters, lastPos);

    while (string::npos != pos || string::npos != lastPos)
    {
        // Found a token, add it to the vector.
        tokens.push_back(str.substr(lastPos, pos - lastPos));
        // Skip delimiters.  Note the "not_of"
        lastPos = str.find_first_not_of(delimiters, pos);
        // Find next "non-delimiter"
        pos = str.find_first_of(delimiters, lastPos);
    }
}
      

The tokenizer can be used in this way:

#include <string>
#include <algorithm>
#include <vector>

using namespace std;

int main()
{
    vector<string> tokens;

    string str("Split me up! Word1 Word2 Word3.");

    Tokenize(str, tokens);

    copy(tokens.begin(), tokens.end(), ostream_iterator<string>(cout, ", "));
}