[Bug libstdc++/44441] New: std::getline set failbit in situation when shouldn't

[Bug libstdc++/44441] New: std::getline set failbit in situation when shouldn't

[qwak82 at gmail dot com]

In this code s failbit is set if last line in s is empty (stream ends with
\n\n):
std::istream s;
//s is some kind of input stream like std::istringstream s("\n\n");
while (s.good()) {
 std::string line;
 std::getline(s, line);
}


-- 
           Summary: std::getline set failbit in situation when shouldn't
           Product: gcc
           Version: 4.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: qwak82 at gmail dot com
  GCC host triplet: ubuntu linux x86-64


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44441

[Bug libstdc++/44441] std::getline set failbit in situation when shouldn't

[schwab at linux-m68k dot org]

------- Comment #1 from schwab at linux-m68k dot org  2010-06-07 11:19 -------
You are getting eof.


-- 

schwab at linux-m68k dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44441

[Bug libstdc++/44441] std::getline set failbit in situation when shouldn't

[qwak82 at gmail dot com]

------- Comment #2 from qwak82 at gmail dot com  2010-06-07 11:36 -------
But also fail bit, this program prints:
line: a          //this is OK, first line
line:            //this is also OK, second (empty) line
fail bit         //eof is set - OK; but fail bit should be set here?

#include <iostream>
#include <sstream>

int main() {
std::istringstream s("a\n");
while (s.good()) {
 std::string line;
 std::getline(s, line);
 std::cout << "line: " << line << std::endl;
}
if (s.fail()) std::cout << "fail bit";
return 0;
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44441

[Bug libstdc++/44441] std::getline set failbit in situation when shouldn't

[redi at gcc dot gnu dot org]

------- Comment #3 from redi at gcc dot gnu dot org  2010-06-07 11:56 -------
[lib.string.io] paragraph 8
If the function extracts no characters, it calls is.setstate(ios_base::failbit)
which may throw ios_base::failure (27.4.4.3).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44441