c ++中的“::”“。”和“ - >”之间的区别 [英] Difference between “::” “.” and “->” in c++

问题描述

我找到了Kwadrat类。作者使用三种类型的operator ::，。和 - >。箭头是唯一的工作。这三个之间有什么区别？

I have found the class Kwadrat. The author used three types of operator ::, . and ->. The arrow is the one that only works. What's the difference between those three?

#include <iostream>

using namespace std;

class Kwadrat{
public:
int val1, val2, val3;
    Kwadrat(int val1, int val2, int val3)
    {
        this->val1 = val1;
        //this.val2 = val2;
        //this::val3 = val3;
    }
};

int main()
{
    Kwadrat* kwadrat = new Kwadrat(1,2,3);
    cout<<kwadrat->val1<<endl;
    cout<<kwadrat->val2<<endl;
    cout<<kwadrat->val3<<endl;
    return 0;
}

推荐答案

• :: 命名空间中的类型，命名空间中的变量，类中的静态变量或类中的类型。


• 命名实例变量或成员函数


• a-> b 是（* a）.b 的语法糖。


• :: names a type within a namespace, a variable within a namespace, a static variable in a class, or a type in a class.
• . names an instance variable or member function
• a->b is syntactic sugar for (*a).b.

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