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1 | // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
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) | |
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 |