namespace psl {

/// usage:
/// const auto visitor = overloads {
///     [](type_1 v){...},
///     [](type_2 v){...},
///     ...
/// };
/// visitor will then be an object with an overloaded function call op
/// which accepts type_1, type_2, etc
/// got this code from https://en.cppreference.com/w/cpp/utility/variant/visit
/// seems to need C++20 to work but haven't researched to double check
template <class... Ts> struct overloads : Ts... {
  using Ts::operator()...;
};

} // namespace psl