Re: exception and streambuf

Dear c++ gurus,

  I am trying to understand why the following piece of code is not
throwing any exception on my system. This is a simplified version just
for the demo (*). My implementation of sync always throw just for this
example. I am using Linux/g++ 4.4.5/debian.

Thanks for any clue,

(*)
#include <iostream>
#include <string>

int write_to_stdout(const char* text, size_t length)
{
  std::string s ( text, text + length);
  std::cout << s << std::endl;
  return length;
}

class windowbuf : public std::streambuf {
  public:
    int sync ();
    int overflow (int ch);
};

int windowbuf::sync ()
{
  throw "Killing Program"; // where did it go ?
  return windowbuf::traits_type::eof();
}

int windowbuf::overflow (int ch)
{
  std::streamsize n = pptr () - pbase ();
  char buffer;
  buffer = ch;
  write_to_stdout( &buffer, 1 );
  pbump (-n); // Reset pptr().
  return 0;
}

int
main (int argc, char*argv[])
{
  windowbuf wbuf;
  std::ostream wstr(&wbuf);
  wstr << "Hello world!" << std::flush;
  return 0;
}