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2-3. Using Type Deduction

2024-08-19 08:08:47   224人阅读

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 }

技术分享

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;
}

技术分享

use auto for local variables as much as possible.　在局部变量的时候使用auto

 

2-3. Using Type Deduction


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