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namespace boost{ namespace multiprecision{ template <unsigned Digits10> class mpfr_float_backend; typedef number<mpfr_float_backend<50> > mpfr_float_50; typedef number<mpfr_float_backend<100> > mpfr_float_100; typedef number<mpfr_float_backend<500> > mpfr_float_500; typedef number<mpfr_float_backend<1000> > mpfr_float_1000; typedef number<mpfr_float_backend<0> > mpfr_float; }} // namespaces
        Class template mpfr_float_backend
        fulfils all of the requirements for a Backend
        type. Its members and non-member functions are deliberately not documented:
        these are considered implementation details that are subject to change.
      
        The class takes a single template parameter - Digits10
        - which is the number of decimal digits precision the type should support.
        When this parameter is zero, then the precision can be set at runtime via
        number::default_precision and number::precision.
        Note that this type does not in any way change the GMP or MPFR library's
        global state (for example it does not change the default precision of the
        mpfr_t data type), therefore you can safely mix this type with existing code
        that uses GMP or MPFR, and also mix mpfr_float_backends
        of differing precision.
      
        The type of number_category<cpp_int<Args...> >::type is std::integral_constant<int,
        number_kind_floating_point>.
      
More information on this type can be found in the tutorial.