To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: iostreams (iomanip.h)
From: david nugent <david AT csource DOT oz DOT au>
Reply-To: david AT csource DOT oz DOT au
Date: Thu, 05 Nov 92 11:27:56 +1000
Organization: Unique Computing Pty Ltd, Melbourne, Australia


  -- x.cc --
  # include <iostream.h>
  # include <iomanip.h>

  void
  main (void)
  {
      cout << "Hex number: " << hex << 102 << endl;
  }
  -- end --

This outputs:

Hex number: 0x66

The "0x" is inserted gratuitously, and in error - it shouldn't be. The
reasons are obvious once you start playing with widths, justification
and fill in ios.  I'm not sure if this is a gnu lib problem or is
specific to the djgpp library but I'll report it here in case it is
only dj's. I've used two other c++ compilers which don't exhibit this
behaviour (sorry, I don't yet have the AT&T iostreams reference to
state definitely what is or is not the "correct" behaviour).

This is with v1.09, but it was the same with 1.08.

I also notice that iomanip.h defines "IOMANIPdeclare(T)" as an empty
macro. Is this because gcc doesn't yet support templates well enough
for it to work? (I recently noticed that libg++ supplied a basically
blank file, I guess for the same reason) I'm currently using a macro
version, slightly hacked from MicroSoft C/C++'s include directory
which seems to work fine.

david



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