Explanations

Classes

• Default access control: Private.

Operator ( :: )

• Used to access the content of a class , struct , scope , or namespace .

• The symbol ::  is used like an "address/directory", so using:

  • MyClass::variable_name , refers to a variable of the class MyClass .

  • ::variable_name , refers to a variable in the global scope.

• Writing using ScopeName  exposes the content of the desired scope in the current scope.