What are some practical use cases for variadic templates in C++?

What are some practical use cases for variadic templates in C++?

Variadic templates in C++ allow functions and classes to accept any number of template parameters. They are useful for creating flexible and reusable code.

Can you give me an example of how to use variadic templates?

Sure! A common use case is creating a function that can take any number of arguments and print them. Here's a simple example:

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

This function uses a fold expression to print all arguments.

What are the advantages of using variadic templates over traditional function overloading?

Variadic templates provide more flexibility and reduce code duplication. Instead of writing multiple overloaded functions for different argument counts, you can handle all cases with a single template function.

Are there any performance considerations when using variadic templates?

Generally, variadic templates can be as efficient as traditional methods, but they may introduce some compile-time overhead due to template instantiation. However, the benefits often outweigh the costs.