class People
{
public:
string name;
int id;
People(string n, int i):name(n),id(i){}
bool operator==(const People& a)
{
return id == a.id && name==a.name;
}
bool operator<( const People& a)
{
if(id == a.id)
return name < a.name;
return id < a.id;
}
} ;
bool operator==(const People& a, const People& b)
{
return a.id == b.id && a.name==b.name;
}
bool operator<(const People &a, const People& b)
{
if(a.id == b.id)
return a.name < b.name;
return a.id < b.id;
}
int main()
{
vector<People> vec;
vec.push_back(People("Michael",23));
vec.push_back(People("James",23));
vec.push_back(People("Kobe",24));
vec.push_back(People("James",23));
cout << "-----按id, then name排序----" << endl;
sort(vec.begin(), vec.end()); // 调用operator<
for(auto& v : vec)
cout << v.id << " " << v.name << endl;
cout << "------去重------------------" << endl;
vec.erase(unique(vec.begin(), vec.end()),vec.end());
// unique删除相邻的一样的,要先排序,unique调用 operator==
for(auto& v : vec)
cout << v.id << " " << v.name << endl;
cout << "-----按名称排序-------------" << endl;
sort(vec.begin(), vec.end(),[](People& a, People& b)
{
return a.name < b.name;
});
for(auto& v : vec)
cout << v.id << " " << v.name << endl;
return 0;
}