libs/lexical_cast/test/lexical_cast_vc8_bug_test.cpp

   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, 2007.
   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 // This tests now must pass on vc8, because lexical_cast
  12 // implementation has changed and it does not use stringstream for casts
  13 // to integral types
  14
  15 #include <boost/config.hpp>
  16 #include <boost/lexical_cast.hpp>
  17 #include <boost/cstdint.hpp>
  18 #include <boost/test/unit_test.hpp>
  19
  20 #include <string>
  21
  22 #ifdef BOOST_MSVC
  23 # pragma warning(disable: 4127) // conditional expression is constant
  24 #endif
  25
  26 using namespace boost;
  27
  28 // See also test_conversion_from_string_to_integral(CharT)
  29 // in libs/conversion/lexical_cast_test.cpp
  30 template<class T, class CharT>
  31 void test_too_long_number(CharT zero)
  32 {
  33     typedef std::numeric_limits<T> limits;
  34
  35     std::basic_string<CharT> s;
  36
  37     std::basic_ostringstream<CharT> o;
  38     o << (limits::max)() << zero;
  39     s = o.str();
  40     BOOST_CHECK_THROW(lexical_cast<T>(s), bad_lexical_cast);
  41     s[s.size()-1] += static_cast<CharT>(9); // '0' -> '9'
  42     BOOST_CHECK_THROW(lexical_cast<T>(s), bad_lexical_cast);
  43
  44     if (limits::is_signed)
  45     {
  46         std::basic_ostringstream<CharT> o2;
  47         o2 << (limits::min)() << zero;
  48         s = o2.str();
  49         BOOST_CHECK_THROW(lexical_cast<T>(s), bad_lexical_cast);
  50         s[s.size()-1] += static_cast<CharT>(9); // '0' -> '9'
  51         BOOST_CHECK_THROW(lexical_cast<T>(s), bad_lexical_cast);
  52     }
  53 }
  54
  55 void test_vc8_bug()
  56 {
  57     test_too_long_number<boost::intmax_t>('0');
  58     test_too_long_number<boost::uintmax_t>('0');
  59 #if !defined(BOOST_LCAST_NO_WCHAR_T)
  60     test_too_long_number<boost::intmax_t>(L'0');
  61     test_too_long_number<boost::uintmax_t>(L'0');
  62 #endif
  63 }
  64
  65 unit_test::test_suite *init_unit_test_suite(int, char *[])
  66 {
  67     unit_test::test_suite *suite =
  68         BOOST_TEST_SUITE("lexical_cast vc8 bug unit test");
  69     suite->add(BOOST_TEST_CASE(test_vc8_bug));
  70     return suite;
  71 }