Scope Resolution Operator
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The scope access (or resolution) operator :: (two colons) lets you access a global (or file duration) member name even if it is hidden by a local redeclaration of that name.
- You can use a global identifier by prefixing it with the scope resolution operator.
- You can access a nested member name by specifying the class name and using the scope resolution operator.
Therefore, the following two functions are different: