What are variadic templates in C++ and how do I use them?

What are variadic templates in C++ and how do I use them?

Variadic templates allow you to create functions and classes that can take a variable number of arguments. They are useful for writing generic and flexible code.

Can you give me an example of a variadic template function?

Sure! Here's a simple example:

template<typename... Args>
void print(Args... args) {
    (std::cout << ... << args) << '\n';
}

This function can take any number of arguments and print them.

How does the parameter pack work in this example?

The parameter pack Args... collects all the arguments passed to the function. The fold expression (std::cout << ... << args) expands this pack to apply the << operator to each argument.

Are there any limitations or pitfalls I should be aware of?

Yes, variadic templates can lead to complex code and compilation errors if not used carefully. It's important to ensure type safety and manage the number of arguments properly.