How to filter duplicate types from tuple C++

Question

How does one filter duplicate types from a tuple?

For example:

using Tuple = std::tuple
usi         


        

Answer 1

If you have access to Boost, then this can be done directly using boost::mp11::mp_unique.

For example:

{
  using not_unique = std::tuple;
  using filtered = boost::mp11::mp_unique;
  static_assert(std::is_same_v, filtered>);
}
{
  using already_unique = std::tuple;
  using filtered = boost::mp11::mp_unique;
  static_assert(std::is_same_v, filtered>);
}

Live example