text: ///////////////////////////////////////////////////////////////
  //  Copyright 2013 Christopher Kormanyos. 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
  //
  
  // Test case for ticket:
  // #8065: Multiprecision rounding issue
  
  #ifdef _MSC_VER
  #  define _SCL_SECURE_NO_WARNINGS
  #endif
  
  #include <boost/detail/lightweight_test.hpp>
  #include "test.hpp"
  #include <boost/multiprecision/cpp_dec_float.hpp>
  #include <boost/math/special_functions/round.hpp>
  
  template<int N>
  static bool round_test_imp()
  {
    typedef boost::multiprecision::cpp_dec_float<N> mp_backend_type;
    typedef boost::multiprecision::number<mp_backend_type, boost::multiprecision::et_off> mp_type;
  
    const mp_type original_digits(1.0F);
  
    const mp_type scale = pow(mp_type(10), N);
  
    mp_type these_digits = original_digits * scale;
  
    these_digits  = boost::math::round(these_digits);
    these_digits /= scale;
  
    const std::string result = these_digits.str();
  
    return (result == original_digits.str());
  }
  
  template<int N>
  struct round_test
  {
    static bool test()
    {
      return (round_test_imp<N>() && round_test<N - 1>::test());
    }
  };
  
  template<>
  struct round_test<0>
  {
    static bool test()
    {
      return round_test_imp<0>();
    }
  };
  
  int main()
  {
     //
     // Test cpp_dec_float rounding with boost::math::round() at various precisions:
     //
     const bool round_test_result = round_test<40>::test();
  
     BOOST_CHECK_EQUAL(round_test_result, true);
  
     return boost::report_errors();
  }
  