vector<string> frame(const vector<string>& v){
vector<string> ret;
string::size_type maxlen = width(v);
string border(maxlen + 4,'*');
//write the top border
ret.push_back(border);
//write each interior row
for(vector<string>::const_iterator i = v.begin();i != v.end();++i){
ret.push_back("* " + *i + string(maxlen- (*i.size()),' ') + " *");
}
//write the bottom border
ret.push_back(border);
return ret;
}
在for循环中,我在访问iterator i返回的字符串的size()成员函数时遇到错误----&gt; * i.size();
“class”std :: _ Vector_const_iterator&gt;&gt;“没有会员”尺寸“
答案 0 :(得分:7)
(*i).size()
。 .
运算符的优先级高于*