Shulou(Shulou.com)05/31 Report--

This article mainly introduces the relevant knowledge of "how to use nullptr and NULL in C++". Xiaobian shows you the operation process through actual cases. The operation method is simple and fast and practical. I hope this article "how to use nullptr and NULL in C++" can help you solve the problem.

1. Why does nullptr appear?

Purpose: nullptr appears primarily to replace NULL.

So why replace NULL?

There are two ways to define NULL, some compilers define NULL as 0, and some compilers define NULL as (void*)0).

What is the difference between these two definitions for c++?

Implicit conversions of ( void* ) to other types are not allowed in c++, and in the case where some compilers define NULL as ((void*)0), NULL becomes defined as 0 when you define variables to assign NULL.

In addition, this problem can also confuse the overloaded nature of c++.

Next, code demonstration

2. code demonstrates

Here is the MyClass class, which has two overloaded functions printf

#include using namespace std;class MyClass{public: MyClass() {} ~MyClass() {}public: void printf(char *) /* overloaded function */ { cout

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.