a problem about gcc-3.2?

a problem about gcc-3.2?

[zsf00]

hello,

The follow codes compile well with egcs++,g++-2.96 and icc.
But can't compile with g++-3.2
#include <fstream>
#include <iostream>

using namespace std;

class FileStream : public fstream {
    public:
                bool isOpen() const;
};

inline bool FileStream :: isOpen() const    {
            return  fstream::is_open();     //line 78                               
}

int main()
{
    FileStream myFileStream;
    cout << myFileStream.isOpen() << endl;
}

g++-3.2 -o test6 test6.cpp 
test6.cpp: In member function `bool FileStream::isOpen() const':
test6.cpp:12: passing `const std::basic_fstream<char, std::char_traits<char> >' 
   as `this' argument of `bool std::basic_fstream<_CharT, _Traits>::is_open() 
   [with _CharT = char, _Traits = std::char_traits<char>]' discards qualifiers

Is it a bug of gcc-3.2?
Best Regards,

Shaofeng Zhang

Re: a problem about gcc-3.2?

[Benjamin Kosnik]

See library defect 72.

73. is_open should be const

Section: 27.8.1 [lib.fstreams]  Status: NAD  Submitter: Matt Austern 
Date: 27 Aug 1998

Classes basic_ifstream, basic_ofstream, and basic_fstream all have a
member function is_open. It should be a const member function, since it
does nothing but call one of basic_filebuf's const member functions.

Proposed resolution:

Rationale:

Not a defect. This is a deliberate feature; const streams would be
meaningless.