Type Deduction 发生在编译时期
可以对一般类型,自定义类型进行类型自推导
下面有两个例子:
1. Using auto with a class
1 #include <iostream> 2 #include <typeinfo> 3 4 using namespace std; 5 6 class MyClass 7 { 8 }; 9 10 int main() 11 { 12 auto variable = MyClass(); 13 cout << "Type of variable: " << typeid(variable).name() << endl; 14 return 0; 15 }
2.Using auto with Uniform Initialization
#include <iostream> #include <typeinfo> using namespace std; class MyClass { }; int main() { auto variable{ 1 }; cout << "Type of variable: " << typeid(variable).name() << endl; auto variable2{ MyClass{} }; cout << "Type of variable: " << typeid(variable2).name() << endl; return 0; }
use auto for local variables as much as possible. 在局部变量的时候使用auto
时间: 2024-08-26 07:18:20