libstdc++/2079: iostream.h needs more using declarations

[dbaron at fas dot harvard dot edu]

>Number:         2079
>Category:       libstdc++
>Synopsis:       iostream.h needs more using declarations
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Fri Feb 23 17:36:02 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     L. David Baron
>Release:        unknown-1.0
>Organization:
>Environment:
Using gcc and libstdc++ from gcc-3_0-branch:
gcc version 3.0 20010222 (prerelease)
>Description:
The backwards-compatibility header <iostream.h> needs more
|using| declarations to compile old code.  In particular,
the following two are needed to compile Mozilla with the
gcc-3_0-branch:

using std::hex;
using std::dec;

There are probably a number of others that are needed as
well (although not for Mozilla).
>How-To-Repeat:
Create a C++ file containing the following:

-----
#include <iostream.h>

int main()
{
  cout << hex << 12 << endl; // should output "c"
  return 0;
}
-----

and compile with g++.  It gives the error:

test.cpp: In function `int main()':
test.cpp:6: `hex' undeclared (first use this function)
test.cpp:6: (Each undeclared identifier is reported only once for each function    it appears in.)

This file compiles with older releases of gcc and (presumably) with all the other C++ compilers that can
compile Mozilla.  If I add the two lines I mentioned above
to iostream.h, the file compiles correctly.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: