|  | Home | Libraries | People | FAQ | More | 
          Return a reference to a std::uint64_t,
          changing the kind and replacing the contents.
        
std::uint64_t& emplace_uint64();
          The value is replaced with a std::uint64_t
          initialized to zero, destroying the previous contents.
        
          Linear in the size of *this.
        
No-throw guarantee.