ceph/src/boost/boost/test/utils/nullstream.hpp

   1 //  (C) Copyright Gennadiy Rozental 2001.
   2 //  (C) Copyright Daryle Walker 2000-2001.
   3 //  Distributed under the Boost Software License, Version 1.0.
   4 //  (See accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt)
   6
   7 //  See http://www.boost.org/libs/test for the library home page.
   8 //
   9 //  File        : $RCSfile$
  10 //
  11 //  Version     : $Revision$
  12 //
  13 //  Description : simulate /dev/null stream
  14 // ***************************************************************************
  15
  16 #ifndef BOOST_TEST_UTILS_NULLSTREAM_HPP
  17 #define BOOST_TEST_UTILS_NULLSTREAM_HPP
  18
  19 // STL
  20 #include <ostream>    // for std::basic_ostream
  21 #include <streambuf>  // for std::basic_streambuf
  22 #include <string>     // for std::char_traits
  23
  24 // Boost
  25 #include <boost/utility/base_from_member.hpp>
  26
  27 #include <boost/test/detail/suppress_warnings.hpp>
  28
  29 //____________________________________________________________________________//
  30
  31 namespace boost {
  32
  33 // ************************************************************************** //
  34 // **************                 basic_nullbuf                ************** //
  35 // ************************************************************************** //
  36 //  Class for a buffer that reads nothing and writes to nothing.
  37 //  Idea from an Usenet post by Tom <the_wid@my-deja.com> at
  38 //  27 Oct 2000 14:06:21 GMT on comp.lang.c++.
  39
  40 template<typename CharType, class CharTraits = ::std::char_traits<CharType> >
  41 class basic_nullbuf : public ::std::basic_streambuf<CharType, CharTraits> {
  42     typedef ::std::basic_streambuf<CharType, CharTraits>  base_type;
  43 public:
  44     // Types
  45     typedef typename base_type::char_type    char_type;
  46     typedef typename base_type::traits_type  traits_type;
  47     typedef typename base_type::int_type     int_type;
  48     typedef typename base_type::pos_type     pos_type;
  49     typedef typename base_type::off_type     off_type;
  50
  51     // Use automatic default constructor and destructor
  52
  53 protected:
  54     // The default implementations of the miscellaneous virtual
  55     // member functions are sufficient.
  56
  57     // The default implementations of the input & putback virtual
  58     // member functions, being nowhere but EOF, are sufficient.
  59
  60     // The output virtual member functions need to be changed to
  61     // accept anything without any problems, instead of being at EOF.
  62     virtual  ::std::streamsize  xsputn( char_type const* /*s*/, ::std::streamsize n )   { return n; } // "s" is unused
  63     virtual  int_type           overflow( int_type c = traits_type::eof() )         { return traits_type::not_eof( c ); }
  64 };
  65
  66 typedef basic_nullbuf<char>      nullbuf;
  67 typedef basic_nullbuf<wchar_t>  wnullbuf;
  68
  69 // ************************************************************************** //
  70 // **************               basic_onullstream              ************** //
  71 // ************************************************************************** //
  72 //  Output streams based on basic_nullbuf.
  73
  74 #ifdef BOOST_MSVC
  75 # pragma warning(push)
  76 # pragma warning(disable: 4355) // 'this' : used in base member initializer list
  77 #endif
  78
  79 template< typename CharType, class CharTraits = ::std::char_traits<CharType> >
  80 class basic_onullstream : private boost::base_from_member<basic_nullbuf<CharType, CharTraits> >
  81                         , public ::std::basic_ostream<CharType, CharTraits> {
  82     typedef boost::base_from_member<basic_nullbuf<CharType, CharTraits> >   pbase_type;
  83     typedef ::std::basic_ostream<CharType, CharTraits>                      base_type;
  84 public:
  85     // Constructor
  86     basic_onullstream() : pbase_type(), base_type( &this->pbase_type::member ) {}
  87 };
  88
  89 #ifdef BOOST_MSVC
  90 # pragma warning(default: 4355)
  91 # pragma warning(pop)
  92 #endif
  93
  94 typedef basic_onullstream<char>      onullstream;
  95 typedef basic_onullstream<wchar_t>  wonullstream;
  96
  97 }  // namespace boost
  98
  99 //____________________________________________________________________________//
 100
 101 #include <boost/test/detail/enable_warnings.hpp>
 102
 103 #endif  // BOOST_TEST_UTILS_NULLSTREAM_HPP