cerr(3C++) - cerr(3C++)
Standard C++ Library Copyright 1998, Rogue Wave Software, Inc.
NAMEcerr
- Controls output to an unbuffered stream buffer associated with the
object stderr declared in <cstdio>.
SYNOPSIS
#include <iostream>
extern ostream cerr;
ostream cerr;
DESCRIPTION
The object cerr controls output to an unbuffered stream buffer associ‐
ated with the object stderr declared in <cstdio>. By default, the stan‐
dard C and C++ streams are synchronized, but you can improve perfor‐
mance by using the ios_base member function synch_with_stdio to desyn‐
chronize them.
FORMATTING
The formatting is done through member functions or manipulators. See
cout or basic_ostream for details.
EXAMPLE
//
// cerr 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
cerr << "Error while opening the file" << endl;
}
SEE ALSO
basic_ostream(3C++), basic_iostream(3C++), basic_filebuf(3C++),
cout(3C++), cin(3C++), clog(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 cerr(3C++)