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 |
104 | |