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///////////////////////////////////////////////////////////////
// Copyright 2011 John Maddock. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
//[mpfr_eg
#include <boost/multiprecision/mpfr.hpp>
#include <boost/math/special_functions/gamma.hpp>
#include <iostream>
int main()
{
using namespace boost::multiprecision;
// Operations at variable precision and no numeric_limits support:
mpfr_float a = 2;
mpfr_float::default_precision(1000);
std::cout << mpfr_float::default_precision() << std::endl;
std::cout << sqrt(a) << std::endl; // print root-2
// Operations at fixed precision and full numeric_limits support:
mpfr_float_100 b = 2;
std::cout << std::numeric_limits<mpfr_float_100>::digits << std::endl;
// We can use any C++ std lib function:
std::cout << log(b) << std::endl; // print log(2)
// We can also use any function from Boost.Math:
std::cout << boost::math::tgamma(b) << std::endl;
// These even work when the argument is an expression template:
std::cout << boost::math::tgamma(b * b) << std::endl;
// Access the underlying data:
mpfr_t r;
mpfr_init(r);
mpfr_set(r, b.backend().data(), GMP_RNDN);
mpfr_clear(r);
return 0;
}
//]
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