"::"是什么意思在C ++中意味着什么? [英] What does the "::" mean in C++?

问题描述

这个符号是什么意思?

AirlineTicket::AirlineTicket()

推荐答案

::是范围分辨率运算符-用于限定名称.在这种情况下，它用于将类 AirlineTicket 与构造函数 AirlineTicket()分开，形成限定名称 AirlineTicket :: AirlineTicket()

:: is the scope resolution operator - used to qualify names. In this case it is used to separate the class AirlineTicket from the constructor AirlineTicket(), forming the qualified name AirlineTicket::AirlineTicket()

在需要明确说明所指内容时，可以使用此选项.一些样本:

You use this whenever you need to be explicit with regards to what you're referring to. Some samples:

namespace foo {
  class bar;
}
class bar;
using namespace foo;

现在，您已经使用示波器分辨率运算符来引用特定的条形.

Now you have to use the scope resolution operator to refer to a specific bar.

:: foo :: bar 是完全限定的名称.

:: bar 是另一个完全限定的名称.( :: 首先表示全局名称空间")

::bar is another fully qualified name. (:: first means "global namespace")

struct Base {
    void foo();
};
struct Derived : Base {
    void foo();
    void bar() {
       Derived::foo();
       Base::foo();
    }
};

这使用范围解析来选择特定版本的foo.

This uses scope resolution to select specific versions of foo.

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