std::string startwith endwith split 方法

bool endWith(const string &str, const string &tail) {
	return str.compare(str.size() - tail.size(), tail.size(), tail) == 0;
}

bool startWith(const string &str, const string &head) {
	return str.compare(0, head.size(), head) == 0;
}

void split(const string &strtem, const char a , vector<string> &res)
{
	res.clear();
	string::size_type pos1, pos2;
	pos2 = strtem.find(a);
	pos1 = 0;
	while (string::npos != pos2)
	{
		res.push_back(strtem.substr(pos1, pos2 - pos1));
		pos1 = pos2 + 1;
		pos2 = strtem.find(a, pos1);
	}
	res.push_back(strtem.substr(pos1));
}