Mastering C++: A Comprehensive Quiz Based on 'Thinking in C++

Question: 1 / 565

What defines the visibility of names introduced with a using directive?

The nearest enclosing namespace scope only

The global scope by default

The file in which the using directive is written

The scope in which the directive is made

Names introduced with a using directive are made visible in the scope in which the directive is made, meaning that the names can be accessed within that specific scope. This is important to note because the other options are not fully accurate. Option A states that the nearest enclosing namespace scope only defines visibility, but it's possible for names to be visible in multiple scopes at once. Option B mentions the global scope by default, but this only applies to namespaces that do not have a using directive. Option C mentions the file in which the using directive is written, but this only applies to names that are declared within that specific file, not those introduced through the using directive.

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