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

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How does a using directive impact name visibility in namespaces?

It hides all other names outside the namespace

It makes all names within the namespace visible to its scope

The using directive is used to bring the names defined within a namespace into the current scope. This means that any names within the namespace will now be visible and accessible within the current scope. Option A is incorrect because it would hide all names, including the ones within the namespace. Option C is incorrect because it does not make the namespace itself invisible, it only hides the names within it. Option D is incorrect because importing names as private means they can only be accessed within the current file, not within the namespace. Therefore, the correct answer is B.

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It makes the namespace itself invisible outside its scope

It imports all names as private