C++基础-auto(自动分配属性)和decltype(指定分配属性)
作者:互联网
1.atuo 自动分配属性,但是不能区分常量, decltype可以区分常量
const vector<int> myint{1, 2, 3, 4, 5}; auto inta = myint[0]; inta = 20; decltype(myint[0]) intd = 1; intd = 2; //报错,因为此时的intd是常量属性
2.auto不能区分引用,decltype可以区分引用
double db = 10.9; double &rdb(db); auto dbx = rdb; //如果能区别 dbx = 8.9; cout << db << endl; //10.9 cout << dbx << endl; //8.9 decltype(rdb) dbx1 = rdb; dbx1 = 8.9; cout << db << endl; //8.9 cout << dbx1 << endl; //8.9
标签:intd,decltype,auto,区分,myint,分配,属性 来源: https://www.cnblogs.com/my-love-is-python/p/15121205.html