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clog(3C++)			       -			    clog(3C++)

Standard C++ Library Copyright 1998, Rogue Wave Software, Inc.

NAME
       clog

	- Controls output to a stream buffer associated with the object stderr
       declared in <cstdio>.

SYNOPSIS
       #include <iostream>
       extern ostream clog;
       ostream clog;

DESCRIPTION
       The object clog controls output to a stream buffer associated with  the
       object  stderr  declared	 in  <cstdio>. The difference between clog and
       cerr is that clog is buffered but cerr is not. Therefore, commands like
       clog  <<	 "ERROR	 !!"; and fprintf(stderr,"ERROR !!"); are not synchro‐
       nized.

FORMATTING
       The formatting is done through member functions	or  manipulators.  See
       cout or basic_ostream for details.

EXAMPLE
       //
       // clog example
       //
       #include<iostream>
       #include<fstream>

       void main ( )
       {
 using namespace std;

  // open the file "file_name.txt"
  // for reading
 ifstream in("file_name.txt");

  // output the all file to stdout
 if ( in )
   cout << in.rdbuf();
 else
    // if the ifstream object is in a bad state
    // output an error message to stderr
   clog << "Error while opening the file" << endl;
}

WARNINGS
       clog  can  be used to redirect some of the errors to another recipient.
       For example, you might want to redirect them to a file named my_err:

       ofstream out("my_err");
       if ( out )
 clog.rdbuf(out.rdbuf());

else

 cerr << "Error while opening the file" << endl;

 Then when you are doing something like clog << "error number  x";  the	 error
 message  is output to the file my_err. Obviously, you can use the same scheme
 to redirect clog to other devices.

 If your compiler does not support namespaces, then you do not need the	 using
 declaration for std.

SEE ALSO
       basic_ostream(3C++),	basic_iostream(3C++),	  basic_filebuf(3C++),
       cout(3C++),    cin(3C++),    cerr(3C++),	   wcin(3C++),	  wcout(3C++),
       wcerr(3C++), wclog(3C++), ios_base(3C++), basic_ios(3C++),

       Working Paper for Draft Proposed International Standard for Information
       Systems--Programming Language C++, Section 27.3.1

STANDARDS CONFORMANCE
       ANSI X3J16/ISO WG21 Joint C++ Committee

Rogue Wave Software		  02 Apr 1998			    clog(3C++)
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