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

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  :-(

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