The usage of :: in C++

This is the scope, if you want to reference a static member function outside the class, or define a member function outside the class. Use the types or functions in the namespace (such as: std::cout, std::cin, std::string, etc.)

Instance

class Test{
public:
    Test();
     static void print() 
    {
        std::cout<<"Test"<<endl; //命名空间时使用::
   }
private:
     int a;
};
Test::Test() : a(1)   //定义时使用::
{}
Test::get();  //使用静态成员函数时用::

 

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