From: "A. Sinan Unur" <asu1 AT c-o-r-n-e-l-l DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Question about the latest GNU C++
Date: 22 Jul 2003 20:42:41 GMT
Organization: Cornell University
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Bill Gerics <gericsb AT yahoo DOT com> wrote in
news:20030722191204 DOT 5818 DOT qmail AT web20001 DOT mail DOT yahoo DOT com: 

> Hello,
>  
> I have downloaded the latest GNU C++ and noticed some major changes.
>  
> 1) Header files no longer have the .h extension
>  
> 2) cin, cout and cerr are no longer supported by the iostream library.
> I must modify my calls to these functions to std:: cin, std::cout
> etc-- 
>  
> Why are these changes made 

See the C++ standard.

> that make my code no longer backwards
> compatible and is there anything I can do to my existing programs to
> get them to compile short of making the changes mentioned above.  It
> would seem that these cj=hanges have made existing C++ literature and
> examples obsolete. 

gcc does include backward compatibility headers. Although I recommend you 
familiarize yourself with standard C++, you can still use

#include <iostream.h>

in your code, and it will compile as before (although you'll get warnings 
about depracated language features unless you disable them):

C:\Home>cat old.cc
#include <iostream.h>

int main()
{
    cout << "Hello World!\n";
    return 0;
}

C:\Home\asu1>gxx -Wall old.cc -o old.exe
In file included from c:/djgpp/lang/cxx/3.23/backward/iostream.h:31,
                 from old.cc:1:
c:/djgpp/lang/cxx/3.23/backward/backward_warning.h:32:2: warning: 
#warning This file includes at least one deprecated or antiquated header. 
Please consider using one of the 32 headers found in section 17.4.1.2 of 
the C++ standard. Examples include substituting the <X> header for the 
<X.h> header for C++ includes, or <sstream> instead of the deprecated 
header <strstream.h>. To disable this warning use -Wno-deprecated.

Sinan.

-- 
A. Sinan Unur
asu1 AT c-o-r-n-e-l-l DOT edu
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