C++11中vector的emplace_back用法及輸入輸出操作符的過載
阿新 • • 發佈:2018-12-14
#include <vector> #include <iostream> #include <string> using namespace std; struct A{ int x; double y; string z; A(int _x=0,double _y=0,string _z=""):x(_x),y(_y),z(_z){} A(const A &t):x(t.x),y(t.y),z(t.z){}//copy constructor friend ostream & operator<<(ostream &out, A &obj){ out<<"x:"<<obj.x<<", y:"<<obj.y<<", z="<<obj.z<<endl; return out; } friend istream & operator >> (istream &in, A &obj){ in>>obj.x>>obj.y>>obj.z; if(!in) obj=A(); return in; } }; void test() { vector<A> v; A a; cin>>a; v.emplace_back(0,1.0,"2"); v.emplace_back(a); for(auto i=0;i<v.size();++i){ cout<<v[i]; } }
吐槽CSDN的標題字元限制,<<和>>不能作為標題內容,不然就提示輸入有誤。氣哭。