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namespace boost{ namespace multiprecision{ template <class IntBackend> class rational_adpater; }}
          The class template rational_adaptor
          is a back-end for number
          which converts any existing integer back-end into a rational-number back-end.
        
          So for example, given an integer back-end type MyIntegerBackend,
          the use would be something like:
        
typedef number<MyIntegerBackend> MyInt; typedef number<rational_adaptor<MyIntegerBackend> > MyRational; MyRational r = 2; r /= 3; MyInt i = numerator(r); assert(i == 2);