Ugly, not-to-be-pushed sucking in of all of Boost to get windows to work.
[dyninst.git] / external / boost / iostreams / optimal_buffer_size.hpp
1 // (C) Copyright Jonathan Turkanis 2003.
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 #ifndef BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED
8 #define BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED
9
10 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
11 # pragma once
12 #endif
13
14 #include <boost/config.hpp>  // DEDUCED_TYPENAME, MSVC.
15 #include <boost/detail/workaround.hpp>
16 #include <boost/iostreams/constants.hpp>  // constants.
17 #include <boost/iostreams/detail/dispatch.hpp>
18 #include <boost/iostreams/detail/wrap_unwrap.hpp>
19 #include <boost/iostreams/operations_fwd.hpp>
20 #include <boost/mpl/if.hpp>
21
22 // Must come last.
23 #include <boost/iostreams/detail/config/disable_warnings.hpp>
24
25 namespace boost { namespace iostreams {
26
27 namespace detail {
28
29 template<typename T>
30 struct optimal_buffer_size_impl;
31
32 } // End namespace detail.
33
34 template<typename T>
35 std::streamsize optimal_buffer_size(const T& t)
36 {
37     typedef detail::optimal_buffer_size_impl<T> impl;
38     return impl::optimal_buffer_size(detail::unwrap(t));
39 }
40
41 namespace detail {
42
43 //------------------Definition of optimal_buffer_size_impl--------------------//
44
45 template<typename T>
46 struct optimal_buffer_size_impl
47     : mpl::if_<
48           is_custom<T>,
49           operations<T>,
50           optimal_buffer_size_impl<
51               BOOST_DEDUCED_TYPENAME
52               dispatch<
53                   T, optimally_buffered_tag, device_tag, filter_tag
54               >::type
55           >
56       >::type
57     { };
58
59 template<>
60 struct optimal_buffer_size_impl<optimally_buffered_tag> {
61     template<typename T>
62     static std::streamsize optimal_buffer_size(const T& t)
63     { return t.optimal_buffer_size(); }
64 };
65
66 template<>
67 struct optimal_buffer_size_impl<device_tag> {
68     template<typename T>
69     static std::streamsize optimal_buffer_size(const T&)
70     { return default_device_buffer_size; }
71 };
72
73 template<>
74 struct optimal_buffer_size_impl<filter_tag> {
75     template<typename T>
76     static std::streamsize optimal_buffer_size(const T&)
77     { return default_filter_buffer_size; }
78 };
79
80 } // End namespace detail.
81
82 } } // End namespaces iostreams, boost.
83
84 #include <boost/iostreams/detail/config/enable_warnings.hpp>
85
86 #endif // #ifndef BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED