• 類內默認含有this指針，bool operator==(const T& a)
• 類外則需要寫兩個參數，bool operator==(const T& a, const T& b)

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()); // 調用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刪除相鄰的一樣的，要先排序，unique調用 operator==for(auto& v : vec)cout << v.id << " " << v.name << endl;cout << "-----按名稱排序-------------" << 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; } 運行結果： -----按id, then name排序---- 23 James 23 James 23 Michael 24 Kobe ------去重------------------ 23 James 23 Michael 24 Kobe -----按名稱排序------------- 23 James 24 Kobe 23 Michael

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