Class any_of

example/matcher.cpp:29–49

template <class... Ts>
class any_of {
 public:
  constexpr explicit any_of(Ts... ts) : ts_{ts...} {}

  constexpr auto operator==(std::common_type_t<Ts...> t) const {
    return std::apply([t](auto... args) { return eq(t, args...); }, ts_);
  }

 private:
  template <class T, class U, class... TArgs>
  static constexpr auto eq(const T& t, const U& u, const TArgs&... args) {
    using namespace boost::ut;
    if constexpr (sizeof...(args) > 0) {
      return (that % detail::value{u} == t) or eq(t, args...);
    } else {
      return (that % detail::value{u} == t);
    }
  }

  std::tuple<Ts...> ts_;
};

int main() {
  using namespace boost::ut;