How does the \'injected class name\' feature in C enable templates to refer to themselves?

Injected Class Name in Class Templates Without Template Parameters

In C , the "injected class name" feature allows templates to refer to themselves using their own names. This feature is particularly useful in the context of nested classes within templates.

In the provided code snippet:

<code class="cpp">template<typename E> class Link {
private:
    static Link<E>* freelist;
public:
    E element;
    Link* next;  // This line has no explicit typename argument.
}</code>

The Link class is a template class with one template parameter, E. However, the next member variable of the class does not specify any template parameters in its type declaration. This is an example of the use of the injected class name.

The injected class name refers to the class template itself, including all of its template parameters. In this case, Link is equivalent to Link, where E is the type parameter. By using the injected class name, the code avoids explicitly specifying the template parameter when referring to the class itself.

This feature is particularly useful when working with deeply nested class templates. It can help simplify the code and make it more readable and maintainable. However, it is important to note that the injected class name can only be used within the scope of the class template or its specializations.

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