From: "Alexei A. Frounze" <alex DOT fru AT mtu-net DOT ru>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: C++, complex, etc
Date: Mon, 15 May 2000 04:32:32 +0400
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

I've found a strange solution...

Now my rpogram looks like:
------------8<-------------
#include <iostream.h>
#include <_Complex.h>

int main(void) {
  Complex j (0,1);

  cout << "hello world!\n";
  return 0;
}
------------8<-------------

The source code is no more portable. 

Borland C/C++ doesn't have the "_Complex.h" header file and there is no
class with name "Complex" in "complex.h".

Watcom C/C++ has no the "_Complex.h" header file but have a typedef that
makes "complex" the same as "Complex".

What's going on?

:((((((((((((((((((((((((((((((((((((((((
I'm starting to think that:
- I'm a fool that understands nothing
- I'm an idiot trying to solve all the problems I ever encounter with DJGPP
- I try to use things used pretty seldom by other people, so I have problems
- I'm just unlucky
:((((((((((((((((((((((((((((((((((((((((

Please explain me the purpose of these include/header files from the
"djgpp/lang/cxx" directory:

------------8<-------------
// file name: //
// complex    //

// Main header for the -*- C++ -*- complex number classes.
// This file is part of the GNU ANSI C++ Library.

#ifndef __COMPLEX__
#define __COMPLEX__

#include <std/complext.h>

extern "C++" {
#define __STD_COMPLEX

// ANSI complex types
typedef complex<float> float_complex;
typedef complex<double> double_complex;
typedef complex<long double> long_double_complex;
}

#endif
------------8<-------------

------------8<-------------
// file name: //
// complex.h  //

// -*- C++ -*- backward compatiblity header.
// Copyright (C) 1994 Free Software Foundation

#ifndef __COMPLEX_H__
#include <complex>
#endif
------------8<-------------

------------8<-------------
// file name: //
// _Complex.h //

// This may look like C code, but it is really -*- C++ -*-

#ifndef _Complex_h
#define _Complex_h

// Use the ANSI complex number template.
#include <complex>
typedef complex<double> Complex;

#endif
------------8<-------------

Regards,
Alexei A. Frounze
-----------------------------------------
Homepage: http://alexfru.chat.ru
Mirror:   http://members.xoom.com/alexfru

"Alexei A. Frounze" wrote:
> 
> I just downloaded the lgp2952b.zip file that contains C++ (sorry, G++ :)
> library but that doesn't help.
> 
> --
> Alexei A. Frounze
> -----------------------------------------
> Homepage: http://alexfru.chat.ru
> Mirror:   http://members.xoom.com/alexfru
> 
> "Alexei A. Frounze" wrote:
> >
> > I tried your suggestions, but the error is still the same.
> >
> > Compiler points to the line where I try to define that complex variable.
> >
> > No matter how I define it:
> >   complex j = complex (0,1);
> > or
> >   complex j(0,1);
> >
> > I have still the same problem. "complex" is an unknown thing, although I
> > have a lot of include files for complex math: complex.h, complex,
> > complext.h, ...
> >
> > bye.
> > Alexei A. Frounze
> > -----------------------------------------
> > Homepage: http://alexfru.chat.ru
> > Mirror:   http://members.xoom.com/alexfru
> >
> > Damian Yerrick wrote:
> > >
> > > On Mon, 15 May 2000 01:00:50 +0400, "Alexei A. Frounze"
> > > <alex DOT fru AT mtu-net DOT ru> wrote:
> > >
> > > >Hi!
> > > >
> > > >I'm trying to get working the following program:
> > > >----------------8<----------------
> > > >#include <iostream.h>
> > > >#include <complex.h>
> > >
> > > Change the above lines to
> > >
> > > #include <iostream>
> > > #include <string>
> > > using namespace std;
> > >
> > > >int main(void) {
> > > >  complex j = complex(0,1);
> > >
> > > How about
> > >    complex j(0, 1);
> > >
> > > >  cout << "hello world!\n";
> > > >  return 0;
> > > >}
> > > >----------------8<----------------
> > > >
> > > >I'm trying to compile it using: gcc -c test.cc
> > > >But I get an Error: "'complex' undeclared (first use in this function)".
> > >
> > > Error on what line?
> > >
> > > --