/// \file long_long.h 
/// \ingroup nt_builtin
///
/// This header provides all necessary functions so the fundamental
/// type `long long int` is an `RealEmbeddable` `EuclideanRing`. Due
/// to overflow `long long int` is considered as not exact.
///
/// \cgalModels `EuclideanRing` 
/// \cgalModels `RealEmbeddable` 
