text: //  Unit test for boost::lexical_cast.
  //
  //  See http://www.boost.org for most recent version, including documentation.
  //
  //  Copyright Antony Polukhin, 2011-2020.
  //
  //  Distributed under the Boost
  //  Software License, Version 1.0. (See accompanying file
  //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
  
  #include <boost/config.hpp>
  
  #if defined(__INTEL_COMPILER)
  #pragma warning(disable: 193 383 488 981 1418 1419)
  #elif defined(BOOST_MSVC)
  #pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800)
  #endif
  
  #include <boost/lexical_cast.hpp>
  #include <boost/test/unit_test.hpp>
  #include <boost/range/iterator_range.hpp>
  
  using namespace boost;
  
  #if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
  #define BOOST_LCAST_NO_WCHAR_T
  #endif
  
  template <class T>
  void do_test_on_empty_input(T& v)
  {
      BOOST_CHECK_THROW(lexical_cast<int>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<float>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<double>(v), bad_lexical_cast);
  #ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
      BOOST_CHECK_THROW(lexical_cast<long double>(v), bad_lexical_cast);
  #endif
      BOOST_CHECK_THROW(lexical_cast<unsigned int>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<unsigned short>(v), bad_lexical_cast);
  #if defined(BOOST_HAS_LONG_LONG)
      BOOST_CHECK_THROW(lexical_cast<boost::ulong_long_type>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<boost::long_long_type>(v), bad_lexical_cast);
  #elif defined(BOOST_HAS_MS_INT64)
      BOOST_CHECK_THROW(lexical_cast<unsigned __int64>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<__int64>(v), bad_lexical_cast);
  #endif
  }
  
  void test_empty_iterator_range()
  {
  
      boost::iterator_range<char*> v;
      do_test_on_empty_input(v);
      BOOST_CHECK_EQUAL(lexical_cast<std::string>(v), std::string());
      BOOST_CHECK_THROW(lexical_cast<char>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<unsigned char>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<signed char>(v), bad_lexical_cast);
  
      boost::iterator_range<const char*> cv;
      do_test_on_empty_input(cv);
      BOOST_CHECK_EQUAL(lexical_cast<std::string>(cv), std::string());
      BOOST_CHECK_THROW(lexical_cast<char>(cv), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<unsigned char>(cv), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<signed char>(cv), bad_lexical_cast);
  
      const boost::iterator_range<const char*> ccv;
      do_test_on_empty_input(ccv);
      BOOST_CHECK_EQUAL(lexical_cast<std::string>(ccv), std::string());
      BOOST_CHECK_THROW(lexical_cast<char>(ccv), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<unsigned char>(ccv), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<signed char>(ccv), bad_lexical_cast);
  }
  
  void test_empty_string()
  {
      std::string v;
      do_test_on_empty_input(v);
      BOOST_CHECK_THROW(lexical_cast<char>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<unsigned char>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<signed char>(v), bad_lexical_cast);
  
  #ifndef BOOST_LCAST_NO_WCHAR_T
      std::wstring vw;
      do_test_on_empty_input(vw);
      BOOST_CHECK_THROW(lexical_cast<wchar_t>(vw), bad_lexical_cast);
  #endif
  
  // Currently, no compiler and STL library fully support char16_t and char32_t
  //#ifndef BOOST_NO_CXX11_CHAR16_T
  //    std::basic_string<char16_t> v16w;
  //    do_test_on_empty_input(v16w);
  //    BOOST_CHECK_THROW(lexical_cast<char16_t>(v16w), bad_lexical_cast);
  //#endif
  //#ifndef BOOST_NO_CXX11_CHAR32_T
  //    std::basic_string<char32_t> v32w;
  //    do_test_on_empty_input(v32w);
  //    BOOST_CHECK_THROW(lexical_cast<char32_t>(v32w), bad_lexical_cast);
  //#endif
  }
  
  struct Escape
  {
      Escape(const std::string& s)
          : str_(s)
      {}
  
      std::string str_;
  };
  
  inline std::ostream& operator<< (std::ostream& o, const Escape& rhs)
  {
      return o << rhs.str_;
  }
  
  void test_empty_user_class()
  {
      Escape v("");
      do_test_on_empty_input(v);
      BOOST_CHECK_THROW(lexical_cast<char>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<unsigned char>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<signed char>(v), bad_lexical_cast);
  }
  
  namespace std {
  inline std::ostream & operator<<(std::ostream & out, const std::vector<long> & v)
  {
      std::ostream_iterator<long> it(out);
      std::copy(v.begin(), v.end(), it);
      BOOST_CHECK(out);
      return out;
  }
  }
  
  void test_empty_vector()
  {
      std::vector<long> v;
      do_test_on_empty_input(v);
      BOOST_CHECK_THROW(lexical_cast<char>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<unsigned char>(v), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<signed char>(v), bad_lexical_cast);
  }
  
  
  struct my_string {
      friend std::ostream &operator<<(std::ostream& sout, my_string const&/* st*/) {
              return sout << "";
      }
  };
  
  void test_empty_zero_terminated_string()
  {
      my_string st;
      BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(st), std::string());;
  }
  
  unit_test::test_suite *init_unit_test_suite(int, char *[])
  {
      unit_test::test_suite *suite =
          BOOST_TEST_SUITE("lexical_cast. Empty input unit test");
      suite->add(BOOST_TEST_CASE(&test_empty_iterator_range));
      suite->add(BOOST_TEST_CASE(&test_empty_string));
      suite->add(BOOST_TEST_CASE(&test_empty_user_class));
      suite->add(BOOST_TEST_CASE(&test_empty_vector));
      suite->add(BOOST_TEST_CASE(&test_empty_zero_terminated_string));
  
      return suite;
  }
  