Ugly, not-to-be-pushed sucking in of all of Boost to get windows to work.
[dyninst.git] / external / boost / iostreams / filter / stdio.hpp
1 // (C) Copyright Jonathan Turkanis 2005.
2 // Distributed under the Boost Software License, Version 1.0. (See accompanying
3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
4
5 // See http://www.boost.org/libs/iostreams for documentation.
6
7 // Based on the work of Christopher Diggins.
8
9 #ifndef BOOST_IOSTREAMS_STDIO_FILTER_HPP_INCLUDED
10 #define BOOST_IOSTREAMS_STDIO_FILTER_HPP_INCLUDED
11
12 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
13 # pragma once
14 #endif
15
16 #include <iostream>
17 #include <memory>    // allocator.
18 #include <vector>
19 #include <boost/iostreams/detail/config/wide_streams.hpp>
20 #include <boost/iostreams/detail/char_traits.hpp>
21 #include <boost/iostreams/detail/ios.hpp>
22 #include <boost/iostreams/device/array.hpp>
23 #include <boost/iostreams/device/back_inserter.hpp>
24 #include <boost/iostreams/filter/aggregate.hpp>
25 #include <boost/iostreams/pipeline.hpp>
26 #include <boost/iostreams/stream_buffer.hpp>
27
28 namespace boost { namespace iostreams {
29
30 namespace detail {
31
32 } // End namespace detail.
33
34 template<typename Ch, typename Alloc = std::allocator<Ch> >
35 class basic_stdio_filter : public aggregate_filter<Ch, Alloc> {
36 private:
37     typedef aggregate_filter<Ch, Alloc>       base_type;
38 public:
39     typedef typename base_type::char_type    char_type;
40     typedef typename base_type::category     category;
41     typedef typename base_type::vector_type  vector_type;
42 private:
43     static std::istream& standard_input(char*) { return std::cin; }
44     static std::ostream& standard_output(char*) { return std::cout; }
45 #ifndef BOOST_IOSTREAMS_NO_WIDE_STREAMS
46     static std::wistream& standard_input(wchar_t*) { return std::wcin; }
47     static std::wostream& standard_output(wchar_t*) { return std::wcout; }
48 #endif // BOOST_IOSTREAMS_NO_WIDE_STREAMS
49
50     struct scoped_redirector { // Thanks to Maxim Egorushkin.
51         typedef BOOST_IOSTREAMS_CHAR_TRAITS(Ch)                  traits_type;
52         typedef BOOST_IOSTREAMS_BASIC_IOS(Ch, traits_type)       ios_type;
53         typedef BOOST_IOSTREAMS_BASIC_STREAMBUF(Ch, traits_type) streambuf_type;
54         scoped_redirector( ios_type& ios,
55                            streambuf_type* newbuf )
56             : ios_(ios), old_(ios.rdbuf(newbuf))
57             { }
58         ~scoped_redirector() { ios_.rdbuf(old_); }
59         ios_type&  ios_;
60         streambuf_type*                 old_;
61     };
62
63     virtual void do_filter() = 0;
64     virtual void do_filter(const vector_type& src, vector_type& dest)
65     {
66         stream_buffer< basic_array_source<Ch> >
67                           srcbuf(&src[0], &src[0] + src.size());
68         stream_buffer< back_insert_device<vector_type> >
69                           destbuf(iostreams::back_inserter(dest));
70         scoped_redirector redirect_input(standard_input((Ch*)0), &srcbuf);
71         scoped_redirector redirect_output(standard_output((Ch*)0), &destbuf);
72         do_filter();
73     }
74 };
75 BOOST_IOSTREAMS_PIPABLE(basic_stdio_filter, 2)
76
77 typedef basic_stdio_filter<char>     stdio_filter;
78 typedef basic_stdio_filter<wchar_t>  wstdio_wfilter;
79
80 } } // End namespaces iostreams, boost.
81
82 #endif // #ifndef BOOST_IOSTREAMS_STDIO_FILTER_HPP_INCLUDED