What are some examples of variadic templates in C++?

What are some examples of variadic templates in C++?

Variadic templates allow functions and classes to accept any number of template parameters. For example, here's a simple function that sums any number of arguments:

template<typename... Args>
auto sum(Args... args) {
    return (args + ...);
}

This function uses a fold expression to sum all the arguments.

Can you show me another example using variadic templates?

Sure! Here's an example of a variadic template class that stores a tuple of values:

#include <tuple>

template<typename... Args>
class MyTuple {
public:
    std::tuple<Args...> data;
    MyTuple(Args... args) : data(args...) {}
};

This class can hold any number of values of different types.

What are the advantages of using variadic templates?

Variadic templates provide flexibility and type safety, allowing you to create functions and classes that can handle a variable number of arguments without needing to overload functions for different argument counts.

Are there any limitations to variadic templates?

Yes, variadic templates can lead to complex code and longer compilation times. Additionally, debugging can be more challenging due to the increased template instantiation.