What are some use cases for variadic templates in C++11?

What are some use cases for variadic templates in C++11?

Variadic templates in C++11 allow functions and classes to accept an arbitrary 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 print any number of arguments. Here's a simple example:

#include <iostream>

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

int main() {
    print(1, 2, 3, "Hello", 4.5);
}

This function uses a fold expression to print all arguments.

What are the advantages of using variadic templates over traditional methods?

Variadic templates provide type safety, reduce code duplication, and allow for more expressive and flexible interfaces compared to traditional methods like using std::initializer_list or overloading.

Are there any performance considerations when using variadic templates?

Generally, variadic templates can lead to more efficient code since they allow for compile-time optimizations. However, excessive template instantiation can increase compile times.