| 1 | // Unit test for boost::lexical_cast. |
|---|---|
| 2 | // |
| 3 | // See http://www.boost.org for most recent version, including documentation. |
| 4 | // |
| 5 | // Copyright Alexander Nasonov, 2006. |
| 6 | // Copyright Antony Polukhin, 2023-2024. |
| 7 | // |
| 8 | // Distributed under the Boost |
| 9 | // Software License, Version 1.0. (See accompanying file |
| 10 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt). |
| 11 | // |
| 12 | // Test round-tripping conversion FPT -> string -> FPT, |
| 13 | // where FPT is Floating Point Type. |
| 14 | |
| 15 | #include <boost/lexical_cast.hpp> |
| 16 | |
| 17 | #include <boost/core/lightweight_test.hpp> |
| 18 | |
| 19 | #if (defined(__CYGWIN__) || defined(__FreeBSD__) || defined(__NetBSD__) \ |
| 20 | || (defined(__hppa) && !defined(__OpenBSD__)) || (defined(__NO_LONG_DOUBLE_MATH) && (DBL_MANT_DIG != LDBL_MANT_DIG))) \ |
| 21 | || defined(__MINGW64__) |
| 22 | # define BOOST_LEXICAL_CAST_NO_LONG_DOUBLE_MATH_FUNCTIONS |
| 23 | #endif |
| 24 | |
| 25 | template<class T> |
| 26 | void test_round_conversion() |
| 27 | { |
| 28 | T epsilon = std::numeric_limits<T>::epsilon(); |
| 29 | std::string const epsilon_s = boost::lexical_cast<std::string>(epsilon); |
| 30 | BOOST_TEST(epsilon == boost::lexical_cast<T>(epsilon_s)); |
| 31 | |
| 32 | T max_ = (std::numeric_limits<T>::max)(); |
| 33 | std::string const max_s = boost::lexical_cast<std::string>(max_); |
| 34 | BOOST_TEST(max_ == boost::lexical_cast<T>(max_s)); |
| 35 | |
| 36 | T min_ = (std::numeric_limits<T>::min)(); |
| 37 | std::string const min_s = boost::lexical_cast<std::string>(min_); |
| 38 | BOOST_TEST(min_ == boost::lexical_cast<T>(min_s)); |
| 39 | |
| 40 | T max_div137 = max_ / 137; |
| 41 | std::string max_div137_s = boost::lexical_cast<std::string>(max_div137); |
| 42 | BOOST_TEST(max_div137 == boost::lexical_cast<T>(max_div137_s)); |
| 43 | |
| 44 | T epsilon_mult137 = epsilon * 137; |
| 45 | std::string epsilon_mult137_s(boost::lexical_cast<std::string>(epsilon_mult137)); |
| 46 | BOOST_TEST(epsilon_mult137 == boost::lexical_cast<T>(epsilon_mult137_s)); |
| 47 | |
| 48 | } |
| 49 | |
| 50 | // See bug http://tinyurl.com/vhpvo |
| 51 | template<class T> |
| 52 | void test_msvc_magic_values() |
| 53 | { |
| 54 | T magic_msvc = 0.00010000433948393407; |
| 55 | std::string magic_msvc_s = boost::lexical_cast<std::string>(magic_msvc); |
| 56 | BOOST_TEST(magic_msvc == boost::lexical_cast<T>(magic_msvc_s)); |
| 57 | } |
| 58 | |
| 59 | void test_round_conversion_float() |
| 60 | { |
| 61 | test_round_conversion<float>(); |
| 62 | } |
| 63 | |
| 64 | void test_round_conversion_double() |
| 65 | { |
| 66 | test_round_conversion<double>(); |
| 67 | test_msvc_magic_values<double>(); |
| 68 | } |
| 69 | |
| 70 | void test_round_conversion_long_double() |
| 71 | { |
| 72 | // We do not run tests on compilers and Standard Libraries with poor support of long double |
| 73 | #if !defined(BOOST_LEXICAL_CAST_NO_LONG_DOUBLE_MATH_FUNCTIONS) |
| 74 | test_round_conversion<long double>(); |
| 75 | test_msvc_magic_values<long double>(); |
| 76 | #endif |
| 77 | BOOST_TEST(true); |
| 78 | } |
| 79 | |
| 80 | int main() |
| 81 | { |
| 82 | test_round_conversion_float(); |
| 83 | test_round_conversion_double(); |
| 84 | test_round_conversion_long_double(); |
| 85 | |
| 86 | return boost::report_errors(); |
| 87 | } |
| 88 | |
| 89 |