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1 // (C) Copyright Jonathan Turkanis 2003. |
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2 // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
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4 |
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5 // See http://www.boost.org/libs/iostreams for documentation. |
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6 |
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7 #ifndef BOOST_IOSTREAMS_FLUSH_HPP_INCLUDED |
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8 #define BOOST_IOSTREAMS_FLUSH_HPP_INCLUDED |
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9 |
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10 #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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11 # pragma once |
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12 #endif |
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13 |
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14 #include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC. |
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15 #include <boost/detail/workaround.hpp> |
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16 #include <boost/iostreams/detail/dispatch.hpp> |
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17 #include <boost/iostreams/detail/streambuf.hpp> |
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18 #include <boost/iostreams/detail/wrap_unwrap.hpp> |
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19 #include <boost/iostreams/operations_fwd.hpp> |
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20 #include <boost/iostreams/traits.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 flush_device_impl; |
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32 |
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33 template<typename T> |
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34 struct flush_filter_impl; |
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35 |
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36 } // End namespace detail. |
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37 |
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38 template<typename T> |
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39 bool flush(T& t) |
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40 { return detail::flush_device_impl<T>::flush(detail::unwrap(t)); } |
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41 |
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42 template<typename T, typename Sink> |
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43 bool flush(T& t, Sink& snk) |
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44 { return detail::flush_filter_impl<T>::flush(detail::unwrap(t), snk); } |
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45 |
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46 namespace detail { |
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47 |
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48 //------------------Definition of flush_device_impl---------------------------// |
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49 |
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50 template<typename T> |
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51 struct flush_device_impl |
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52 : mpl::if_< |
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53 is_custom<T>, |
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54 operations<T>, |
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55 flush_device_impl< |
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56 BOOST_DEDUCED_TYPENAME |
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57 dispatch< |
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58 T, ostream_tag, streambuf_tag, flushable_tag, any_tag |
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59 >::type |
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60 > |
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61 >::type |
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62 { }; |
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63 |
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64 template<> |
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65 struct flush_device_impl<ostream_tag> { |
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66 template<typename T> |
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67 static bool flush(T& t) |
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68 { return t.rdbuf()->BOOST_IOSTREAMS_PUBSYNC() == 0; } |
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69 }; |
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70 |
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71 template<> |
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72 struct flush_device_impl<streambuf_tag> { |
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73 template<typename T> |
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74 static bool flush(T& t) |
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75 { return t.BOOST_IOSTREAMS_PUBSYNC() == 0; } |
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76 }; |
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77 |
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78 template<> |
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79 struct flush_device_impl<flushable_tag> { |
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80 template<typename T> |
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81 static bool flush(T& t) { return t.flush(); } |
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82 }; |
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83 |
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84 template<> |
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85 struct flush_device_impl<any_tag> { |
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86 template<typename T> |
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87 static bool flush(T&) { return true; } |
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88 }; |
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89 |
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90 //------------------Definition of flush_filter_impl---------------------------// |
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91 |
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92 template<typename T> |
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93 struct flush_filter_impl |
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94 : mpl::if_< |
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95 is_custom<T>, |
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96 operations<T>, |
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97 flush_filter_impl< |
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98 BOOST_DEDUCED_TYPENAME |
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99 dispatch< |
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100 T, flushable_tag, any_tag |
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101 >::type |
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102 > |
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103 >::type |
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104 { }; |
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105 |
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106 template<> |
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107 struct flush_filter_impl<flushable_tag> { |
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108 template<typename T, typename Sink> |
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109 static bool flush(T& t, Sink& snk) { return t.flush(snk); } |
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110 }; |
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111 |
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112 template<> |
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113 struct flush_filter_impl<any_tag> { |
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114 template<typename T, typename Sink> |
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115 static bool flush(T&, Sink&) { return false; } |
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116 }; |
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117 |
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118 } // End namespace detail. |
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119 |
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120 } } // End namespaces iostreams, boost. |
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121 |
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122 #include <boost/iostreams/detail/config/enable_warnings.hpp> |
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123 |
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124 #endif // #ifndef BOOST_IOSTREAMS_FLUSH_HPP_INCLUDED |