From: gsm77 AT aol DOT com (GSM77)
Newsgroups: comp.os.msdos.djgpp
Subject: Incomprehensible Warning ...
Lines: 50
Message-ID: <1998060509563900.FAA21150@ladder03.news.aol.com>
NNTP-Posting-Host: ladder03.news.aol.com
Date: 05 Jun 1998 09:56:39 GMT
Organization: AOL, http://www.aol.fr
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

Sorry, but i'm French ...
I got this warning : 

"initialization of non-const reference `struct X &' from rvalue 'X'
in passing argument 2 of `operator >>(istream &, X &)'" 

I don't understand why ...

The program is like this :
=============================
struct X
  {
  "some junk vars"
    friend istream & operator >> ( istream & , X & );
  };

struct Y
     : public X
  {
  "some other junk vars"
    friend istream & operator >> ( istream & , Y & );
  } ;


istream &
operator >> ( istream & f, X & b)
  {
      "some read on streams "
  return f;
  }

istream &
operator >> ( istream & f, Y & b)
  {
    f >> static_cast <X> (b);                            /* It's on this line
... */

   "some read on streams "
  return f;
  }

=============================


So if you know what does it means, please explain me !


Bye  :-(