使用引用返回额外信息

#include<string>
#include<iostream>
using namespace std;
string::size_type zx(const string&s,const char& target,int&cnt)
{
	auto ret = s.size();
	cnt = 0;

	for (decltype(ret)i = 0; i != s.size(); ++i)
	{
		if (s[i] == target)
		{
			if (ret == s.size())
				ret = i;
			++cnt;
		}
	}
	return ret;
}

int main() {
	string ozy = "ni shi gou ba!";
	char target = 'a';
	int cnt = 0;

	int index = zx(ozy, target, cnt);
	cout << "where:" + to_string(index) << endl;cout<< "content:"+to_string(cnt) << endl;
}

如果返回多个值, 使用引用.