16.4. Variadic Templates
A variadic template is a template function or class that can take a varying number of parameters. The varying parameters are known as a parameter pack. There are two kinds of parameter packs: A template parameter pack represents zero or more template parameters, and a function parameter pack represents zero or more function parameters.
We use an ellipsis to indicate that a template or function parameter represents a pack. In a template parameter list, class... or typename... indicates that the following parameter represents ...
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