text: #ifndef EZY_IDENTITY_H_INCLUDED
  #define EZY_IDENTITY_H_INCLUDED
  
  namespace ezy
  {
      struct identity_fn
      {
        template <typename T>
        constexpr T&& operator()(T&& t) const noexcept
        {
          return static_cast<T&&>(t);
        }
      };
  
    static constexpr identity_fn identity{};
  }
  
  #endif
  