1 | // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
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2 | // (C) Copyright 2003-2007 Jonathan Turkanis |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
5 | |
6 | // See http://www.boost.org/libs/iostreams for documentation. |
7 | |
8 | #ifndef BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED |
9 | #define BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED |
10 | |
11 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
12 | # pragma once |
13 | #endif |
14 | |
15 | #include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC. |
16 | #include <boost/detail/workaround.hpp> |
17 | #include <boost/iostreams/constants.hpp> // constants. |
18 | #include <boost/iostreams/detail/dispatch.hpp> |
19 | #include <boost/iostreams/detail/wrap_unwrap.hpp> |
20 | #include <boost/iostreams/operations_fwd.hpp> |
21 | #include <boost/mpl/if.hpp> |
22 | |
23 | // Must come last. |
24 | #include <boost/iostreams/detail/config/disable_warnings.hpp> |
25 | |
26 | namespace boost { namespace iostreams { |
27 | |
28 | namespace detail { |
29 | |
30 | template<typename T> |
31 | struct optimal_buffer_size_impl; |
32 | |
33 | } // End namespace detail. |
34 | |
35 | template<typename T> |
36 | std::streamsize optimal_buffer_size(const T& t) |
37 | { |
38 | typedef detail::optimal_buffer_size_impl<T> impl; |
39 | return impl::optimal_buffer_size(detail::unwrap(t)); |
40 | } |
41 | |
42 | namespace detail { |
43 | |
44 | //------------------Definition of optimal_buffer_size_impl--------------------// |
45 | |
46 | template<typename T> |
47 | struct optimal_buffer_size_impl |
48 | : mpl::if_< |
49 | is_custom<T>, |
50 | operations<T>, |
51 | optimal_buffer_size_impl< |
52 | BOOST_DEDUCED_TYPENAME |
53 | dispatch< |
54 | T, optimally_buffered_tag, device_tag, filter_tag |
55 | >::type |
56 | > |
57 | >::type |
58 | { }; |
59 | |
60 | template<> |
61 | struct optimal_buffer_size_impl<optimally_buffered_tag> { |
62 | template<typename T> |
63 | static std::streamsize optimal_buffer_size(const T& t) |
64 | { return t.optimal_buffer_size(); } |
65 | }; |
66 | |
67 | template<> |
68 | struct optimal_buffer_size_impl<device_tag> { |
69 | template<typename T> |
70 | static std::streamsize optimal_buffer_size(const T&) |
71 | { return default_device_buffer_size; } |
72 | }; |
73 | |
74 | template<> |
75 | struct optimal_buffer_size_impl<filter_tag> { |
76 | template<typename T> |
77 | static std::streamsize optimal_buffer_size(const T&) |
78 | { return default_filter_buffer_size; } |
79 | }; |
80 | |
81 | } // End namespace detail. |
82 | |
83 | } } // End namespaces iostreams, boost. |
84 | |
85 | #include <boost/iostreams/detail/config/enable_warnings.hpp> |
86 | |
87 | #endif // #ifndef BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED |
88 |