[/
  Copyright 2011 - 2020 John Maddock.
  Copyright 2013 - 2019 Paul A. Bristow.
  Copyright 2013 Christopher Kormanyos.

  Distributed under the Boost Software License, Version 1.0.
  (See accompanying file LICENSE_1_0.txt or copy at
  http://www.boost.org/LICENSE_1_0.txt).
]

[section:mpf_ref gmp_float]

   namespace boost{ namespace multiprecision{

   template <unsigned Digits10>
   class gmp_float;

   typedef number<gmp_float<50> >    mpf_float_50;
   typedef number<gmp_float<100> >   mpf_float_100;
   typedef number<gmp_float<500> >   mpf_float_500;
   typedef number<gmp_float<1000> >  mpf_float_1000;
   typedef number<gmp_float<0> >     mpf_float;

   }} // namespaces

Class template `gmp_float` fulfils all of the requirements for a [link boost_multiprecision.ref.backendconc 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 library's global state (for example
it does not change the default precision of the mpf_t data type), therefore you can safely mix this type with existing
code that uses GMP, and also mix `gmp_float`s of differing precision.

The type of `number_category<cpp_int<Args...> >::type` is `mpl::int_<number_kind_floating_point>`.

More information on this type can be found in the [link boost_multiprecision.tut.floats.gmp_float tutorial].

[endsect]