63e88f80
 Hu Chunming
提交三方库
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/*
Copyright 2021-2022 Glen Joseph Fernandes
(glenjofe@gmail.com)
Distributed under the Boost Software License, Version 1.0.
(http://www.boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_IO_NULLSTREAM_HPP
#define BOOST_IO_NULLSTREAM_HPP
#include <boost/config.hpp>
#include <ostream>
#include <streambuf>
namespace boost {
namespace io {
template<class CharT, class Traits = std::char_traits<CharT> >
class basic_nullbuf
: public std::basic_streambuf<CharT, Traits> {
protected:
typename Traits::int_type overflow(typename Traits::int_type c)
BOOST_OVERRIDE {
return Traits::not_eof(c);
}
std::streamsize xsputn(const CharT*, std::streamsize n) BOOST_OVERRIDE {
return n;
}
};
namespace detail {
template<class CharT, class Traits>
class nullbuf {
public:
boost::io::basic_nullbuf<CharT, Traits>* buf() {
return &buf_;
}
private:
boost::io::basic_nullbuf<CharT, Traits> buf_;
};
} /* detail */
template<class CharT, class Traits = std::char_traits<CharT> >
class basic_onullstream
: detail::nullbuf<CharT, Traits>
, public std::basic_ostream<CharT, Traits> {
public:
basic_onullstream()
: std::basic_ostream<CharT, Traits>(detail::nullbuf<CharT,
Traits>::buf()) { }
};
typedef basic_onullstream<char> onullstream;
typedef basic_onullstream<wchar_t> wonullstream;
} /* io */
} /* boost */
#endif
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