Variadic Parameter Pack Count

Variadic Parameter Pack Count

In this Kata you will reimplement the sizeof... function that determines the size of a variadic paramter pack. Your function will have to be efficient since thousands of arguments will be passed to it.

The default approach to this kind of problems is to use recursion but this wont work here since it will exceed the maximal recursion depth.

Examples:

arg_length(1, 2, 3); // Should return 3
arg_length("Hello", "World"); // should return 2
arg_length("foo", 1); // should return 2

Solutions

🧠 C++

template <typename... Ts>
constexpr std::size_t arg_length(Ts...) noexcept
{
  return std::tuple_size<std::tuple<Ts...>>();
}