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/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
#include <streambuf>
#include <locale>
#include <cstdio>
template <class charT, class traits = std::char_traits<charT> >
class basic_outbuf : public std::basic_streambuf<charT,traits>
/* central output function
* - print characters in uppercase mode
virtual typename traits::int_type overflow (typename traits::int_type c) {
if (!traits::eq_int_type(c,traits::eof())) {
// convert lowercase to uppercase
c = std::toupper(c,getloc());
// and write the character to the standard output
if (putchar(c) == EOF) {
return traits::eof();
return traits::not_eof(c);
typedef basic_outbuf<char> outbuf;
typedef basic_outbuf<wchar_t> woutbuf;