[Bug libstdc++/21955] New: std::stringbuf vs. in_avail

[bkoz at gcc dot gnu dot org]

Basically, in_avail for stringbufs is missing key bits.




#include <iostream>
#include <sstream>
#include <stdexcept>

double
test_stringstream()
{
  double result;
  char* source = "1918";
  std::stringstream s;
  s << source;

  std::string tmp = s.str();
  std::streambuf* sb = s.rdbuf();
  int i = sb->in_avail();

  if (i)
    {
      s >> result;
      std::cerr << "conversion result = " << result << std::endl;
    }
  else
    {
      throw std::runtime_error("conversion failed");
    }
  return result;
}


int main ()
{
  test_stringstream();
  return 0;
}


I believe this to be a bug, and quite unintentional. 

However, it's pretty easily fixed.

This is a tracker from RH bugzilla 159408
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=159408

-- 
           Summary: std::stringbuf vs. in_avail
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bkoz at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21955