C++ string split函数实现

#include <iostream>
#include <string>
#include <vector>
using namespace std;

vector<string> split(string str, string pattern) {
vector<string> result;
str += pattern;
for (int i = 0; i < str.size(); i++) {
int pos = (int)str.find(pattern, i);
if (pos != string::npos) {
result.push_back(str.substr(i, pos - i));
i = pos + (int)pattern.size() - 1;
}
}
return result;
}

int main() {
string s = "I have a dream!";
vector<string> res = split(s, " ");
return 0;
}