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#### rational_adaptor

    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);