What does :: mean in c++

The meaning of::operator in C

In C, the ::operator is called the range resolution operator, and it has two main purposes:

1. Access members within the namespace

Namespace is a way of organizing code in C. If a class or function is defined within a namespace, you need to use the :: operator to access it. For example:

<code class="cpp">namespace my_namespace {
  int my_variable;
}

int main() {
  my_namespace::my_variable = 10;
  return 0;
}</code>

2. Access members in the global scope

The global scope is the root level of the namespace. If a class or function is defined in the global scope, you can also use the :: operator to access it. For example:

<code class="cpp">class MyClass {
  // ...
};

int main() {
  ::MyClass my_object; // :: 表示MyClass在全局作用域中
  return 0;
}</code>

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