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### gmp_int

    namespace boost{ namespace multiprecision{

    class gmp_int;

    typedef number<gmp_int >         mpz_int;

    }} // namespaces

Class template `gmp_int` 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 type of `number_category<cpp_int<Args...> >::type` is `std::integral_constant<int, number_kind_integer>`.

More information on this type can be found in the tutorial.