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 // 7 // Distributed under the Boost 8 // Software License, Version 1.0. (See accompanying file 9 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt). 10 // 11 // Test round-tripping conversion FPT -> string -> FPT, 12 // where FPT is Floating Point Type. 13 14 #include <boost/config.hpp> 15 16 #if defined(__INTEL_COMPILER) 17 #pragma warning(disable: 193 383 488 981 1418 1419) 18 #elif defined(BOOST_MSVC) 19 #pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800) 20 #endif 21 22 #include <boost/lexical_cast.hpp> 23 #include <boost/test/unit_test.hpp> 24 25 using namespace boost; 26 27 void test_round_conversion_float(); 28 void test_round_conversion_double(); 29 void test_round_conversion_long_double(); 30 init_unit_test_suite(int,char * [])31unit_test::test_suite *init_unit_test_suite(int, char *[]) 32 { 33 unit_test::test_suite *suite = 34 BOOST_TEST_SUITE("lexical_cast unit test"); 35 suite->add(BOOST_TEST_CASE(&test_round_conversion_float)); 36 suite->add(BOOST_TEST_CASE(&test_round_conversion_double)); 37 suite->add(BOOST_TEST_CASE(&test_round_conversion_long_double)); 38 39 return suite; 40 } 41 42 template<class T> test_round_conversion()43void test_round_conversion() 44 { 45 T epsilon = std::numeric_limits<T>::epsilon(); 46 std::string const epsilon_s = boost::lexical_cast<std::string>(epsilon); 47 BOOST_CHECK(epsilon == lexical_cast<T>(epsilon_s)); 48 49 T max_ = (std::numeric_limits<T>::max)(); 50 std::string const max_s = boost::lexical_cast<std::string>(max_); 51 BOOST_CHECK(max_ == lexical_cast<T>(max_s)); 52 53 T min_ = (std::numeric_limits<T>::min)(); 54 std::string const min_s = boost::lexical_cast<std::string>(min_); 55 BOOST_CHECK(min_ == lexical_cast<T>(min_s)); 56 57 T max_div137 = max_ / 137; 58 std::string max_div137_s = boost::lexical_cast<std::string>(max_div137); 59 BOOST_CHECK(max_div137 == lexical_cast<T>(max_div137_s)); 60 61 T epsilon_mult137 = epsilon * 137; 62 std::string epsilon_mult137_s(lexical_cast<std::string>(epsilon_mult137)); 63 BOOST_CHECK(epsilon_mult137 == lexical_cast<T>(epsilon_mult137_s)); 64 65 } 66 67 // See bug http://tinyurl.com/vhpvo 68 template<class T> test_msvc_magic_values()69void test_msvc_magic_values() 70 { 71 T magic_msvc = 0.00010000433948393407; 72 std::string magic_msvc_s = boost::lexical_cast<std::string>(magic_msvc); 73 BOOST_CHECK(magic_msvc == lexical_cast<T>(magic_msvc_s)); 74 } 75 test_round_conversion_float()76void test_round_conversion_float() 77 { 78 test_round_conversion<float>(); 79 } 80 test_round_conversion_double()81void test_round_conversion_double() 82 { 83 test_round_conversion<double>(); 84 test_msvc_magic_values<double>(); 85 } 86 test_round_conversion_long_double()87void test_round_conversion_long_double() 88 { 89 // We do not run tests on compilers with bugs 90 #ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS 91 test_round_conversion<long double>(); 92 test_msvc_magic_values<long double>(); 93 #endif 94 BOOST_CHECK(true); 95 } 96 97