ostream_iterator详细解析 金蝉脱壳剧情详细解析

class Person
{
public:
Person(const string& firstname,conststring& lastname)
{
this->firstname=firstname;
this->lastname=lastname;
}
//如果没有const,那么下面的copy()会报告一堆错误,重载为const是一个好习惯
friend ostream& operator<<(ostream& os,constPerson& p)
{
os<}
private:
string firstname ;

string lastname ;
friend class PersonSort;
};
class PersonSort
{
public:
bool operator()(const Person& p1,constPerson& p2) const
{
return(p1.lastname}
};
int main()
{
typedef set PersonSet;
PersonSet ps;
ps.insert(Person("hongjian","chen"));
ps.insert(Person("lizhong","li"));
ps.insert(Person("xuan","liu"));
copy(ps.begin(),ps.end(),ostream_iterator(cout,"/n"));
return 0;
}