outbuf1x.hpp

stl自带源码

/* 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>
{
  protected:
    /* 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;