Module: Standard C++ Library Library: Input/output
A predefined stream that controls output to an unbuffered stream buffer associated with the object stderr declared in <cstdio>
#include <iostream>
namespace std {
extern wostream wcerr;
}
The object wcerr controls output to an unbuffered stream buffer associated with the object stderr declared in <cstdio>. By default the standard C and C++ streams are synchronized, but you can improve performance by using the ios_base member function synch_with_stdio to desynchronize them.
wcerr uses the locale codecvt facet to convert the wide characters it receives to the tiny characters it outputs to stderr.
The formatting is done through member functions or manipulators. See cout, wcout, or basic_ostream for details.
//
// wcerr example
//
#include <iostream>
#include <fstream>
void main ( )
{
using namespace std;
// open the file "file_name.txt"
// for reading
wifstream in("file_name.txt");
// output the all file to stdout
if ( in )
wcout << in.rdbuf();
else
// if the wifstream object is in a bad state
// output an error message to stderr
wcerr << L"Error while opening the file" << endl;
}
basic_ostream, basic_iostream, basic_filebuf, cout, cin, cerr, clog, wcin, wcout, wclog, ios_base, basic_ios
ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 27.3.2
Copyright (c) 1994-2006 Rogue Wave Software, a Quovadx Division.
Licensed under the Apache License, Version 2.0.
Contact Rogue Wave about documentation or support issues. You can also seek help from other developers through the Apache stdcxx community (see below).