text: //  Unit test for boost::lexical_cast.
  //
  //  See http://www.boost.org for most recent version, including documentation.
  //
  //  Copyright Antony Polukhin, 2011.
  //
  //  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/cstdint.hpp>
  #include <boost/test/unit_test.hpp>
  #include <boost/test/floating_point_comparison.hpp>
  
  void test_conversion_from_to_float();
  void test_conversion_from_to_double();
  void test_conversion_from_to_long_double();
  
  using namespace boost;
  
  
  unit_test::test_suite *init_unit_test_suite(int, char *[])
  {
      unit_test::test_suite *suite =
          BOOST_TEST_SUITE("lexical_cast float types unit test");
      suite->add(BOOST_TEST_CASE(&test_conversion_from_to_float));
      suite->add(BOOST_TEST_CASE(&test_conversion_from_to_double));
      suite->add(BOOST_TEST_CASE(&test_conversion_from_to_long_double));
  
      return suite;
  }
  
  
  // Replace "-,999" with "-999".
  template<class CharT>
  std::basic_string<CharT> to_str_gcc_workaround(std::basic_string<CharT> str)
  {
      std::locale loc;
      std::numpunct<CharT> const& np = BOOST_USE_FACET(std::numpunct<CharT>, loc);
      std::ctype<CharT> const& ct = BOOST_USE_FACET(std::ctype<CharT>, loc);
  
      if(np.grouping().empty())
          return str;
  
      CharT prefix[3] = { ct.widen('-'), np.thousands_sep(), CharT() };
  
      if(str.find(prefix) != 0)
          return str;
  
      prefix[1] = CharT();
      str.replace(0, 2, prefix);
      return str;
  }
  
  template<class CharT, class T>
  std::basic_string<CharT> to_str(T t)
  {
      std::basic_ostringstream<CharT> o;
      o << t;
      return to_str_gcc_workaround(o.str());
  }
  
  
  template<class T>
  void test_conversion_from_to_float_for_locale()
  {
      std::locale current_locale;
      typedef std::numpunct<char> numpunct;
      numpunct const& np = BOOST_USE_FACET(numpunct, current_locale);
      if ( !np.grouping().empty() )
      {
          BOOST_CHECK_THROW(
                  lexical_cast<T>( std::string("100") + np.thousands_sep() + np.thousands_sep() + "0" )
                  , bad_lexical_cast);
          BOOST_CHECK_THROW(lexical_cast<T>( std::string("100") + np.thousands_sep() ), bad_lexical_cast);
          BOOST_CHECK_THROW(lexical_cast<T>( np.thousands_sep() + std::string("100") ), bad_lexical_cast);
          BOOST_CHECK_THROW(lexical_cast<T>( std::string("1") + np.thousands_sep() + np.decimal_point() + "e10" ), bad_lexical_cast);
          BOOST_CHECK_THROW(lexical_cast<T>( std::string("1e10") + np.thousands_sep() ), bad_lexical_cast);
          BOOST_CHECK_THROW(lexical_cast<T>( std::string("1") + np.thousands_sep() + "e10" ), bad_lexical_cast);
  
          BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( to_str< char >(100000) ), 100000, (std::numeric_limits<T>::epsilon()) );
          BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( to_str< char >(10000000u) ), 10000000u, (std::numeric_limits<T>::epsilon()) );
          BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( to_str< char >(100) ), 100, (std::numeric_limits<T>::epsilon()) );
  #if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
          BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( to_str< wchar_t >(100000) ), 100000, (std::numeric_limits<T>::epsilon()) );
          BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( to_str< wchar_t >(10000000u) ), 10000000u, (std::numeric_limits<T>::epsilon()) );
          BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( to_str< wchar_t >(100) ), 100, (std::numeric_limits<T>::epsilon()) );
  #endif
          // Exception must not be thrown, when we are using no separators at all
          BOOST_CHECK_CLOSE_FRACTION( lexical_cast<T>("30000"), static_cast<T>(30000), (std::numeric_limits<T>::epsilon()) );
      }
  }
  
  
  
  
  /*
   * Converts char* [and wchar_t*] to float number type and checks, that generated
   * number does not exceeds allowed epsilon.
   */
  #ifndef BOOST_LCAST_NO_WCHAR_T
  #define CHECK_CLOSE_ABS_DIFF(VAL,PREFIX)                                                          \
      converted_val = lexical_cast<test_t>(#VAL);                                                   \
      BOOST_CHECK_CLOSE_FRACTION( (VAL ## L? VAL ## L : std::numeric_limits<test_t>::epsilon()),    \
                         (converted_val ? converted_val : std::numeric_limits<test_t>::epsilon()),  \
                         std::numeric_limits<test_t>::epsilon()                                     \
                       );                                                                           \
      BOOST_CHECK_EQUAL(converted_val, lexical_cast<test_t>(L## #VAL) );
  
  #else
  #define CHECK_CLOSE_ABS_DIFF(VAL,TYPE)                                                            \
      converted_val = lexical_cast<test_t>(#VAL);                                                   \
      BOOST_CHECK_CLOSE_FRACTION( (VAL ## L? VAL ## L : std::numeric_limits<test_t>::epsilon()),    \
                         (converted_val ? converted_val : std::numeric_limits<test_t>::epsilon()),  \
                         std::numeric_limits<test_t>::epsilon()                                     \
                       );
  #endif
  
  template <class TestType>
  void test_converion_to_float_types()
  {
      typedef TestType test_t;
      test_t converted_val;
  
      BOOST_CHECK_CLOSE_FRACTION(1.0, lexical_cast<test_t>('1'), (std::numeric_limits<test_t>::epsilon()));
      BOOST_CHECK_EQUAL(0.0, lexical_cast<test_t>('0'));
  
      unsigned char const uc_one = '1';
      unsigned char const uc_zero ='0';
      BOOST_CHECK_CLOSE_FRACTION(1.0, lexical_cast<test_t>(uc_one), (std::numeric_limits<test_t>::epsilon()));
      BOOST_CHECK_EQUAL(0.0, lexical_cast<test_t>(uc_zero));
  
      signed char const sc_one = '1';
      signed char const sc_zero ='0';
      BOOST_CHECK_CLOSE_FRACTION(1.0, lexical_cast<test_t>(sc_one), (std::numeric_limits<test_t>::epsilon()));
      BOOST_CHECK_EQUAL(0.0, lexical_cast<test_t>(sc_zero));
  
      BOOST_CHECK_CLOSE_FRACTION(1e34L, lexical_cast<test_t>( "10000000000000000000000000000000000"), (std::numeric_limits<test_t>::epsilon()) );
  
  //    VC failes the next test
  //    BOOST_CHECK_CLOSE_FRACTION(1e-35L, lexical_cast<test_t>("0.00000000000000000000000000000000001"), (std::numeric_limits<test_t>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(
                                      0.1111111111111111111111111111111111111111111111111111111111111111111111111L
              , lexical_cast<test_t>("0.1111111111111111111111111111111111111111111111111111111111111111111111111")
              , (std::numeric_limits<test_t>::epsilon()) );
  
      CHECK_CLOSE_ABS_DIFF(1,test_t);
      BOOST_CHECK_EQUAL(0,lexical_cast<test_t>("0"));
      CHECK_CLOSE_ABS_DIFF(-1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(1.0, test_t);
      CHECK_CLOSE_ABS_DIFF(0.0, test_t);
      CHECK_CLOSE_ABS_DIFF(-1.0,test_t);
  
      CHECK_CLOSE_ABS_DIFF(1e1, test_t);
      CHECK_CLOSE_ABS_DIFF(0e1, test_t);
      CHECK_CLOSE_ABS_DIFF(-1e1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(1.0e1, test_t);
      CHECK_CLOSE_ABS_DIFF(0.0e1, test_t);
      CHECK_CLOSE_ABS_DIFF(-1.0e1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(1e-1, test_t);
      CHECK_CLOSE_ABS_DIFF(0e-1, test_t);
      CHECK_CLOSE_ABS_DIFF(-1e-1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(1.0e-1, test_t);
      CHECK_CLOSE_ABS_DIFF(0.0e-1, test_t);
      CHECK_CLOSE_ABS_DIFF(-1.0e-1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(1E1, test_t);
      CHECK_CLOSE_ABS_DIFF(0E1, test_t);
      CHECK_CLOSE_ABS_DIFF(-1E1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(1.0E1, test_t);
      CHECK_CLOSE_ABS_DIFF(0.0E1, test_t);
      CHECK_CLOSE_ABS_DIFF(-1.0E1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(1E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(0E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(-1E-1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(1.0E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(0.0E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(-1.0E-1, test_t);
  
      CHECK_CLOSE_ABS_DIFF(.0E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(.0E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(-.0E-1, test_t);
  
      CHECK_CLOSE_ABS_DIFF(10.0, test_t);
      CHECK_CLOSE_ABS_DIFF(00.0, test_t);
      CHECK_CLOSE_ABS_DIFF(-10.0,test_t);
  
      CHECK_CLOSE_ABS_DIFF(10e1, test_t);
      CHECK_CLOSE_ABS_DIFF(00e1, test_t);
      CHECK_CLOSE_ABS_DIFF(-10e1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(10.0e1, test_t);
      CHECK_CLOSE_ABS_DIFF(00.0e1, test_t);
      CHECK_CLOSE_ABS_DIFF(-10.0e1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(10e-1, test_t);
      CHECK_CLOSE_ABS_DIFF(00e-1, test_t);
      CHECK_CLOSE_ABS_DIFF(-10e-1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(10.0e-1, test_t);
      CHECK_CLOSE_ABS_DIFF(00.0e-1, test_t);
      CHECK_CLOSE_ABS_DIFF(-10.0e-1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(10E1, test_t);
      CHECK_CLOSE_ABS_DIFF(00E1, test_t);
      CHECK_CLOSE_ABS_DIFF(-10E1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(10.0E1, test_t);
      CHECK_CLOSE_ABS_DIFF(00.0E1, test_t);
      CHECK_CLOSE_ABS_DIFF(-10.0E1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(10E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(00E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(-10E-1,test_t);
  
      CHECK_CLOSE_ABS_DIFF(10.0E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(00.0E-1, test_t);
      CHECK_CLOSE_ABS_DIFF(-10.0E-1, test_t);
  
      CHECK_CLOSE_ABS_DIFF(-10101.0E-011, test_t);
      CHECK_CLOSE_ABS_DIFF(-10101093, test_t);
      CHECK_CLOSE_ABS_DIFF(10101093, test_t);
  
      CHECK_CLOSE_ABS_DIFF(-.34, test_t);
      CHECK_CLOSE_ABS_DIFF(.34, test_t);
      CHECK_CLOSE_ABS_DIFF(.34e10, test_t);
  
      BOOST_CHECK_THROW(lexical_cast<test_t>("-1.e"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("-1.E"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.e"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.E"), bad_lexical_cast);
  
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.0e"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.0E"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("10E"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("10e"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.0e-"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.0E-"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("10E-"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("10e-"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("e1"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("e-1"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("e-"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>(".e"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>(".11111111111111111111111111111111111111111111111111111111111111111111ee"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>(".11111111111111111111111111111111111111111111111111111111111111111111e-"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("."), bad_lexical_cast);
  
      BOOST_CHECK_THROW(lexical_cast<test_t>("-B"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("0xB"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("0x0"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("--1.0"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.0e--1"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.0.0"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1e1e1"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.0e-1e-1"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>(" 1.0"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("1.0 "), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>(""), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("-"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>('\0'), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>('-'), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>('.'), bad_lexical_cast);
  }
  
  template <class T>
  void test_float_typess_for_overflows()
  {
      typedef T test_t;
      test_t minvalue = (std::numeric_limits<test_t>::min)();
      std::string s_min_value = lexical_cast<std::string>(minvalue);
      BOOST_CHECK_CLOSE_FRACTION(minvalue, lexical_cast<test_t>(minvalue), (std::numeric_limits<test_t>::epsilon()));
      BOOST_CHECK_CLOSE_FRACTION(minvalue, lexical_cast<test_t>(s_min_value), (std::numeric_limits<test_t>::epsilon() * 2));
  
      test_t maxvalue = (std::numeric_limits<test_t>::max)();
      std::string s_max_value = lexical_cast<std::string>(maxvalue);
      BOOST_CHECK_CLOSE_FRACTION(maxvalue, lexical_cast<test_t>(maxvalue), (std::numeric_limits<test_t>::epsilon()));
      BOOST_CHECK_CLOSE_FRACTION(maxvalue, lexical_cast<test_t>(s_max_value), (std::numeric_limits<test_t>::epsilon()));
  
      BOOST_CHECK_THROW(lexical_cast<test_t>(s_max_value+"1"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>(s_max_value+"9"), bad_lexical_cast);
  
      // VC9 can fail the fllowing tests on floats and doubles when using stingstream...
      BOOST_CHECK_THROW(lexical_cast<test_t>("1"+s_max_value), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<test_t>("9"+s_max_value), bad_lexical_cast);
  
      if ( is_same<test_t,float>::value )
      {
          BOOST_CHECK_THROW(lexical_cast<test_t>( (std::numeric_limits<double>::max)() ), bad_lexical_cast);
          BOOST_CHECK(
                  (std::numeric_limits<double>::min)() - std::numeric_limits<test_t>::epsilon()
                  <= lexical_cast<test_t>( (std::numeric_limits<double>::min)() )
                  && lexical_cast<test_t>( (std::numeric_limits<double>::min)() )
                  <= (std::numeric_limits<double>::min)() + std::numeric_limits<test_t>::epsilon()
          );
      }
  
      if ( sizeof(test_t) < sizeof(long double) )
      {
          BOOST_CHECK_THROW(lexical_cast<test_t>( (std::numeric_limits<long double>::max)() ), bad_lexical_cast);
          BOOST_CHECK(
                  (std::numeric_limits<long double>::min)() - std::numeric_limits<test_t>::epsilon()
                  <= lexical_cast<test_t>( (std::numeric_limits<long double>::min)() )
                  && lexical_cast<test_t>( (std::numeric_limits<long double>::min)() )
                  <= (std::numeric_limits<long double>::min)() + std::numeric_limits<test_t>::epsilon()
          );
      }
  }
  
  #undef CHECK_CLOSE_ABS_DIFF
  
  // Epsilon is multiplied by 2 because of two lexical conversions
  #define TEST_TO_FROM_CAST_AROUND_TYPED(VAL,STRING_TYPE)                             \
      test_value = VAL + std::numeric_limits<test_t>::epsilon() * i ;                 \
      converted_val = lexical_cast<test_t>( lexical_cast<STRING_TYPE>(test_value) );  \
      BOOST_CHECK_CLOSE_FRACTION(                                                     \
              test_value,                                                             \
              converted_val,                                                          \
              std::numeric_limits<test_t>::epsilon() * 2                              \
          );
  
  /*
   * For interval [ from_mult*epsilon+VAL, to_mult*epsilon+VAL ], converts float type
   * numbers to string[wstring] and then back to float type, then compares initial
   * values and generated.
   * Step is epsilon
   */
  #ifndef BOOST_LCAST_NO_WCHAR_T
  #   define TEST_TO_FROM_CAST_AROUND(VAL)                    \
      for(i=from_mult; i<=to_mult; ++i) {                     \
          TEST_TO_FROM_CAST_AROUND_TYPED(VAL, std::string)    \
          TEST_TO_FROM_CAST_AROUND_TYPED(VAL, std::wstring)   \
      }
  #else
  #   define TEST_TO_FROM_CAST_AROUND(VAL)                    \
      for(i=from_mult; i<=to_mult; ++i) {                     \
          TEST_TO_FROM_CAST_AROUND_TYPED(VAL, std::string)    \
      }
  #endif
  
  template <class TestType>
  void test_converion_from_to_float_types()
  {
      typedef TestType test_t;
      test_t test_value;
      test_t converted_val;
  
      int i;
      int from_mult = -50;
      int to_mult = 50;
  
      TEST_TO_FROM_CAST_AROUND( 0.0 );
  
      long double val1;
      for(val1 = 1.0e-10L; val1 < 1e11; val1*=10 )
          TEST_TO_FROM_CAST_AROUND( val1 );
  
      long double val2;
      for(val2 = -1.0e-10L; val2 > -1e11; val2*=10 )
          TEST_TO_FROM_CAST_AROUND( val2 );
  
      from_mult = -100;
      to_mult = 0;
      TEST_TO_FROM_CAST_AROUND( (std::numeric_limits<test_t>::max)() );
  
      from_mult = 0;
      to_mult = 100;
      TEST_TO_FROM_CAST_AROUND( (std::numeric_limits<test_t>::min)() );
  }
  
  #undef TEST_TO_FROM_CAST_AROUND
  #undef TEST_TO_FROM_CAST_AROUND_TYPED
  
  
  template<class T, class CharT>
  void test_conversion_from_float_to_char(CharT zero)
  {
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(0)) == zero + 0);
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(1)) == zero + 1);
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(2)) == zero + 2);
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(3)) == zero + 3);
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(4)) == zero + 4);
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(5)) == zero + 5);
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(6)) == zero + 6);
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(7)) == zero + 7);
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(8)) == zero + 8);
      BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(9)) == zero + 9);
  
      BOOST_CHECK_THROW(lexical_cast<CharT>(static_cast<T>(10)), bad_lexical_cast);
  
      T t = (std::numeric_limits<T>::max)();
      BOOST_CHECK_THROW(lexical_cast<CharT>(t), bad_lexical_cast);
  }
  
  template<class T, class CharT>
  void test_conversion_from_char_to_float(CharT zero)
  {
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 0)), static_cast<T>(0), (std::numeric_limits<T>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 1)), static_cast<T>(1), (std::numeric_limits<T>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 2)), static_cast<T>(2), (std::numeric_limits<T>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 3)), static_cast<T>(3), (std::numeric_limits<T>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 4)), static_cast<T>(4), (std::numeric_limits<T>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 5)), static_cast<T>(5), (std::numeric_limits<T>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 6)), static_cast<T>(6), (std::numeric_limits<T>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 7)), static_cast<T>(7), (std::numeric_limits<T>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 8)), static_cast<T>(8), (std::numeric_limits<T>::epsilon()) );
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 9)), static_cast<T>(9), (std::numeric_limits<T>::epsilon()) );
  
      BOOST_CHECK_THROW(lexical_cast<T>( static_cast<CharT>(zero + 10)), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<T>( static_cast<CharT>(zero - 1)), bad_lexical_cast);
  }
  
  struct restore_oldloc
  {
      std::locale oldloc;
      ~restore_oldloc() { std::locale::global(oldloc); }
  };
  
  template<class T>
  void test_conversion_from_to_float()
  {    char const zero = '0';
      signed char const szero = '0';
      unsigned char const uzero = '0';
      test_conversion_from_float_to_char<T>(zero);
      test_conversion_from_char_to_float<T>(zero);
      test_conversion_from_float_to_char<T>(szero);
      test_conversion_from_char_to_float<T>(szero);
      test_conversion_from_float_to_char<T>(uzero);
      test_conversion_from_char_to_float<T>(uzero);
      #if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
      wchar_t const wzero = L'0';
      test_conversion_from_float_to_char<T>(wzero);
      test_conversion_from_char_to_float<T>(wzero);
      #endif
  
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>("+1"), 1, std::numeric_limits<T>::epsilon());
      BOOST_CHECK_CLOSE_FRACTION(lexical_cast<T>("+9"), 9, std::numeric_limits<T>::epsilon());
  
      BOOST_CHECK_THROW(lexical_cast<T>("++1"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<T>("-+9"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<T>("--1"), bad_lexical_cast);
      BOOST_CHECK_THROW(lexical_cast<T>("+-9"), bad_lexical_cast);
  
      test_converion_to_float_types<T>();
      test_float_typess_for_overflows<T>();
      test_converion_from_to_float_types<T>();
  
  
      typedef std::numpunct<char> numpunct;
  
      restore_oldloc guard;
      std::locale const& oldloc = guard.oldloc;
  
      std::string grouping1 = BOOST_USE_FACET(numpunct, oldloc).grouping();
      std::string grouping2(grouping1);
  
      test_conversion_from_to_float_for_locale<T>();
  
      try
      {
          std::locale newloc("");
          std::locale::global(newloc);
  
          grouping2 = BOOST_USE_FACET(numpunct, newloc).grouping();
      }
      catch(std::exception const& ex)
      {
          std::string msg("Failed to set system locale: ");
          msg += ex.what();
          BOOST_TEST_MESSAGE(msg);
      }
  
      if(grouping1 != grouping2)
          test_conversion_from_to_float_for_locale<T>();
  
      if(grouping1.empty() && grouping2.empty())
          BOOST_TEST_MESSAGE("Formatting with thousands_sep has not been tested");
  }
  
  
  void test_conversion_from_to_float()
  {
      test_conversion_from_to_float<float>();
  }
  void test_conversion_from_to_double()
  {
      test_conversion_from_to_float<double>();
  }
  void test_conversion_from_to_long_double()
  {
      test_conversion_from_to_float<long double>();
  }
  
  
  
  
  
  
  
  