C++

23.6    Templates with Variable Argument Count

You can create templates with any number of arguments for both functions and classes. These are called variadic templates. The syntax looks a bit unusual because the type list uses three dots ... (an ellipsis). They serve here as a kind of operator.

Application Area

In practice, the implementation of such variadic templates is particularly interesting for those involved in creating libraries. However, if you want to create a template that can take a variable number of types, I would first recommend the sequential std::tuple data type (see Chapter 28, Section 28.1). Instead of writing a variadic template yourself, I recommend using a tuple as a parameter instead.

In this context, with ... the parameters ...