c++/8348: fail() flag is set in istringstream when eof() flag is set !

[adamwilkshire at hotmail dot com]

>Number:         8348
>Category:       c++
>Synopsis:       fail() flag is set in istringstream when eof() flag is set !
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Oct 25 02:06:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Adam Wilkshire
>Release:        g++ 3.2
>Organization:
>Environment:
Solaris.
Reading specs from /opt/global/pkg/gcc-3.2/lib/gcc-lib/sparc-sun-solaris2.7/3.2/specs
Configured with: ../gcc-3.2/configure --prefix=/opt/global/pkg/ : (reconfigured) ../gcc-3.2/configure --prefix=/opt/global/pkg/gcc-3.2
Thread model: posix
gcc version 3.2
>Description:
fail() returns true when an operation on istringstream succeeds and reaches the end.
>How-To-Repeat:
run the program without arguments, tellg() fails because of the flag ...
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="temp8.cc"
Content-Disposition: inline; filename="temp8.cc"

#include <sstream>
#include <iostream>
#include <string>

int main(int argc,char** argv){
  std::string num1("555");
  std::istringstream iss(num1);
  std::istream::pos_type pos1=iss.tellg();
  int asNum=0;
  iss >> asNum;
  std::istream::pos_type pos2=iss.tellg();
  std::streamoff off1=pos2-pos1;
  std::cout<<"have "<<asNum<<":"<<off1<<std::endl; 
  std::cout<<iss.good()<<":"<<iss.bad()<<":"<<iss.fail()<<":"<<iss.eof()<<std::endl;
  
}