68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
///////////////////////////////////////////////////////////////
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// Copyright 2013 Christopher Kormanyos. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
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//
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// Test case for ticket:
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// #8065: Multiprecision rounding issue
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#ifdef _MSC_VER
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#define _SCL_SECURE_NO_WARNINGS
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#endif
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#include <boost/detail/lightweight_test.hpp>
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#include "test.hpp"
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#include <boost/multiprecision/cpp_dec_float.hpp>
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#include <boost/math/special_functions/round.hpp>
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template <int N>
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static bool round_test_imp()
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{
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typedef boost::multiprecision::cpp_dec_float<N> mp_backend_type;
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typedef boost::multiprecision::number<mp_backend_type, boost::multiprecision::et_off> mp_type;
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const mp_type original_digits(1.0F);
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const mp_type scale = pow(mp_type(10), N);
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mp_type these_digits = original_digits * scale;
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these_digits = boost::math::round(these_digits);
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these_digits /= scale;
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const std::string result = these_digits.str();
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return (result == original_digits.str());
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}
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template <int N>
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struct round_test
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{
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static bool test()
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{
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return (round_test_imp<N>() && round_test<N - 1>::test());
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}
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};
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template <>
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struct round_test<0>
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{
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static bool test()
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{
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return round_test_imp<0>();
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}
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};
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int main()
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{
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//
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// Test cpp_dec_float rounding with boost::math::round() at various precisions:
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//
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const bool round_test_result = round_test<40>::test();
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BOOST_CHECK_EQUAL(round_test_result, true);
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return boost::report_errors();
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}
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