[STDCXX-321] error on std::operator==(istream_iterator, istream_iterator)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.1.2, 4.1.3, 4.1.4, 4.2.0
• Fix Version/s: 4.2.1
• Component/s: 24. Iterators

Environment

All

• Severity: Compiler Error
• Assignee: Martin Sebor
• Reporter: Martin Sebor
• Created: 19/Jan/07 02:31
• Updated: 02/May/13 02:29
• Resolved: 06/Feb/08 18:59

Description

The well-formed program below fails to compile with both EDG eccp 3.8 and gcc 4.1.0 (I didn't try others but it's likely a bug in the library)

$ cat t.cpp && make t
#include <iterator>

int main ()
{
    std::istream_iterator<char, char> i;
    (void)(i == i);
}

eccp -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG    -D_RWSTD_USE_CONFIG -I/build/sebor/dev/stdlib/include -I/build/sebor/eccp-3.8-11s/include -I/build/sebor/dev/stdlib/include/ansi -I/build/sebor/PlumHall/lvs06a/conform -I/build/sebor/PlumHall/lvs06a/dst.3  -A -x --template_directory=/build/sebor/eccp-3.8-11s/lib -g  --display_error_number --remarks --diag_suppress 193,236,340,401,261,479,487,678,679,815 --diag_suppress 177,381,191,68,550,611,997,549   t.cpp
"/build/sebor/dev/stdlib/include/rw/_streamiter.h", line 124: error #349: no
          operator "!" matches these operands
            operand types are: ! std::basic_istream<char,
                      std::char_traits<char>>
      return (__x._C_strm && !!*__x._C_strm) == (__y._C_strm && !!*__y._C_strm);
                              ^
          detected during instantiation of "bool std::operator==(const
                    std::istream_iterator<_TypeT, _CharT, _Traits, _Distance>
                    &, const std::istream_iterator<_TypeT, _CharT, _Traits,
                    _Distance> &) [with _TypeT=char, _CharT=char,
                    _Traits=std::char_traits<char>, _Distance=int]" at line 6
                    of "t.cpp"

"/build/sebor/dev/stdlib/include/rw/_streamiter.h", line 124: error #349: no
          operator "!" matches these operands
            operand types are: ! std::basic_istream<char,
                      std::char_traits<char>>
      return (__x._C_strm && !!*__x._C_strm) == (__y._C_strm && !!*__y._C_strm);
                                                                 ^
          detected during instantiation of "bool std::operator==(const
                    std::istream_iterator<_TypeT, _CharT, _Traits, _Distance>
                    &, const std::istream_iterator<_TypeT, _CharT, _Traits,
                    _Distance> &) [with _TypeT=char, _CharT=char,
                    _Traits=std::char_traits<char>, _Distance=int]" at line 6
                    of "t.cpp"

2 errors detected in the compilation of "t.cpp".
make: *** [t.o] Error 2

Issue Links

• depends upon: STDCXX-645 stream iterators into different streams compare equal