C++中实现字符串函数split

vector<string> split(string str)
{
string str;
getline(cin,str);
vector<string> vec;
while(1)
{
int pos=str.find(' ');
if(pos==0)
{
str=str.substr(1);
continue;
}
if(pos<0)
{
vec.push_back(str);
break;
}
string tmp = str.substr(0,pos);
str=str.substr(pos+1);
vec.push_back(tmp);
}
vector<string>::iterator iter = vec.begin();
for(;iter != vec.end();++iter)
cout<<*iter<<" ";
return vec;
}