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7c673cae FG |
1 | /////////////////////////////////////////////////////////////// |
2 | // Copyright 2013 Christopher Kormanyos. Distributed under the Boost | |
3 | // Software License, Version 1.0. (See accompanying file | |
92f5a8d4 | 4 | // LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt |
7c673cae FG |
5 | // |
6 | ||
7 | // Test case for ticket: | |
8 | // #8065: Multiprecision rounding issue | |
9 | ||
10 | #ifdef _MSC_VER | |
92f5a8d4 | 11 | #define _SCL_SECURE_NO_WARNINGS |
7c673cae FG |
12 | #endif |
13 | ||
14 | #include <boost/detail/lightweight_test.hpp> | |
15 | #include "test.hpp" | |
16 | #include <boost/multiprecision/cpp_dec_float.hpp> | |
17 | #include <boost/math/special_functions/round.hpp> | |
18 | ||
92f5a8d4 | 19 | template <int N> |
7c673cae FG |
20 | static bool round_test_imp() |
21 | { | |
92f5a8d4 TL |
22 | typedef boost::multiprecision::cpp_dec_float<N> mp_backend_type; |
23 | typedef boost::multiprecision::number<mp_backend_type, boost::multiprecision::et_off> mp_type; | |
7c673cae | 24 | |
92f5a8d4 | 25 | const mp_type original_digits(1.0F); |
7c673cae | 26 | |
92f5a8d4 | 27 | const mp_type scale = pow(mp_type(10), N); |
7c673cae | 28 | |
92f5a8d4 | 29 | mp_type these_digits = original_digits * scale; |
7c673cae | 30 | |
92f5a8d4 TL |
31 | these_digits = boost::math::round(these_digits); |
32 | these_digits /= scale; | |
7c673cae | 33 | |
92f5a8d4 | 34 | const std::string result = these_digits.str(); |
7c673cae | 35 | |
92f5a8d4 | 36 | return (result == original_digits.str()); |
7c673cae FG |
37 | } |
38 | ||
92f5a8d4 | 39 | template <int N> |
7c673cae FG |
40 | struct round_test |
41 | { | |
92f5a8d4 TL |
42 | static bool test() |
43 | { | |
44 | return (round_test_imp<N>() && round_test<N - 1>::test()); | |
45 | } | |
7c673cae FG |
46 | }; |
47 | ||
92f5a8d4 | 48 | template <> |
7c673cae FG |
49 | struct round_test<0> |
50 | { | |
92f5a8d4 TL |
51 | static bool test() |
52 | { | |
53 | return round_test_imp<0>(); | |
54 | } | |
7c673cae FG |
55 | }; |
56 | ||
57 | int main() | |
58 | { | |
59 | // | |
60 | // Test cpp_dec_float rounding with boost::math::round() at various precisions: | |
61 | // | |
62 | const bool round_test_result = round_test<40>::test(); | |
63 | ||
64 | BOOST_CHECK_EQUAL(round_test_result, true); | |
65 | ||
66 | return boost::report_errors(); | |
67 | } |