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