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- ///////////////////////////////////////////////////////////////
- // 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();
- }
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