stl string 分解 split

#include "stdafx.h"
#include 
#include 
using namespace std;
int split(const string& str, vector& ret_, string sep)
	{
		if (str.empty())
		{
			return 0;
		}

		string tmp;
		string::size_type pos_begin = str.find_first_not_of(sep);
		string::size_type comma_pos = 0;

		while (pos_begin != string::npos)
		{
			comma_pos = str.find(sep, pos_begin);
			if (comma_pos != string::npos)
			{
				tmp = str.substr(pos_begin, comma_pos - pos_begin);
				pos_begin = comma_pos + sep.length();
			}
			else
			{
				tmp = str.substr(pos_begin);
				pos_begin = comma_pos;
			}

			if (!tmp.empty())
			{
				ret_.push_back(tmp);
				tmp.clear();
			}
		}
		return 0;
	}