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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_WRITE_HPP_INCLUDED |
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8 #define BOOST_IOSTREAMS_WRITE_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/categories.hpp> |
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17 #include <boost/iostreams/detail/char_traits.hpp> |
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18 #include <boost/iostreams/detail/dispatch.hpp> |
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19 #include <boost/iostreams/detail/ios.hpp> // streamsize. |
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20 #include <boost/iostreams/detail/streambuf.hpp> |
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21 #include <boost/iostreams/detail/wrap_unwrap.hpp> |
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22 #include <boost/iostreams/operations_fwd.hpp> |
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23 #include <boost/iostreams/traits.hpp> |
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24 #include <boost/mpl/if.hpp> |
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25 |
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26 // Must come last. |
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27 #include <boost/iostreams/detail/config/disable_warnings.hpp> |
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28 |
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29 #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-----------------------------------// |
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30 # include <boost/iostreams/detail/vc6/write.hpp> |
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31 #else // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //--------------------------// |
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32 |
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33 namespace boost { namespace iostreams { |
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34 |
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35 namespace detail { |
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36 |
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37 template<typename T> |
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38 struct write_device_impl; |
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39 |
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40 template<typename T> |
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41 struct write_filter_impl; |
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42 |
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43 } // End namespace detail. |
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44 |
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45 template<typename T> |
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46 bool put(T& t, typename char_type_of<T>::type c) |
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47 { return detail::write_device_impl<T>::put(detail::unwrap(t), c); } |
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48 |
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49 template<typename T> |
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50 inline std::streamsize write |
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51 (T& t, const typename char_type_of<T>::type* s, std::streamsize n) |
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52 { return detail::write_device_impl<T>::write(detail::unwrap(t), s, n); } |
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53 |
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54 template<typename T, typename Sink> |
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55 inline std::streamsize |
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56 write( T& t, Sink& snk, const typename char_type_of<T>::type* s, |
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57 std::streamsize n ) |
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58 { return detail::write_filter_impl<T>::write(detail::unwrap(t), snk, s, n); } |
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59 |
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60 namespace detail { |
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61 |
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62 //------------------Definition of write_device_impl---------------------------// |
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63 |
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64 template<typename T> |
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65 struct write_device_impl |
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66 : mpl::if_< |
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67 is_custom<T>, |
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68 operations<T>, |
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69 write_device_impl< |
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70 BOOST_DEDUCED_TYPENAME |
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71 dispatch< |
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72 T, ostream_tag, streambuf_tag, output |
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73 >::type |
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74 > |
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75 >::type |
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76 { }; |
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77 |
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78 template<> |
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79 struct write_device_impl<ostream_tag> { |
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80 template<typename T> |
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81 static bool put(T& t, typename char_type_of<T>::type c) |
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82 { |
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83 typedef typename char_type_of<T>::type char_type; |
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84 typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) traits_type; |
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85 return !traits_type::eq_int_type( t.rdbuf()->s.sputc(), |
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86 traits_type::eof() ); |
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87 } |
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88 |
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89 template<typename T> |
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90 static std::streamsize write |
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91 (T& t, const typename char_type_of<T>::type* s, std::streamsize n) |
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92 { return t.rdbuf()->sputn(s, n); } |
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93 }; |
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94 |
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95 template<> |
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96 struct write_device_impl<streambuf_tag> { |
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97 template<typename T> |
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98 static bool put(T& t, typename char_type_of<T>::type c) |
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99 { |
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100 typedef typename char_type_of<T>::type char_type; |
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101 typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) traits_type; |
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102 return !traits_type::eq_int_type(t.sputc(c), traits_type::eof()); |
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103 } |
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104 |
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105 template<typename T> |
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106 static std::streamsize write |
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107 (T& t, const typename char_type_of<T>::type* s, std::streamsize n) |
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108 { return t.sputn(s, n); } |
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109 }; |
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110 |
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111 template<> |
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112 struct write_device_impl<output> { |
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113 template<typename T> |
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114 static bool put(T& t, typename char_type_of<T>::type c) |
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115 { return t.write(&c, 1) == 1; } |
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116 |
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117 template<typename T> |
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118 static std::streamsize |
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119 write(T& t, const typename char_type_of<T>::type* s, std::streamsize n) |
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120 { return t.write(s, n); } |
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121 }; |
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122 |
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123 //------------------Definition of write_filter_impl---------------------------// |
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124 |
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125 template<typename T> |
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126 struct write_filter_impl |
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127 : mpl::if_< |
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128 is_custom<T>, |
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129 operations<T>, |
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130 write_filter_impl< |
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131 BOOST_DEDUCED_TYPENAME |
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132 dispatch< |
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133 T, multichar_tag, any_tag |
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134 >::type |
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135 > |
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136 >::type |
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137 { }; |
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138 |
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139 template<> |
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140 struct write_filter_impl<multichar_tag> { |
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141 template<typename T, typename Sink> |
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142 static std::streamsize |
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143 write( T& t, Sink& snk, const typename char_type_of<T>::type* s, |
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144 std::streamsize n ) |
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145 { return t.write(snk, s, n); } |
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146 }; |
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147 |
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148 template<> |
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149 struct write_filter_impl<any_tag> { |
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150 template<typename T, typename Sink> |
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151 static std::streamsize |
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152 write( T& t, Sink& snk, const typename char_type_of<T>::type* s, |
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153 std::streamsize n ) |
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154 { |
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155 for (std::streamsize off = 0; off < n; ++off) |
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156 if (!t.put(snk, s[off])) |
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157 return off; |
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158 return n; |
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159 } |
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160 }; |
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161 |
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162 } // End namespace detail. |
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163 |
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164 } } // End namespaces iostreams, boost. |
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165 |
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166 #endif // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-------------------------// |
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167 |
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168 #include <boost/iostreams/detail/config/enable_warnings.hpp> |
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169 |
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170 #endif // #ifndef BOOST_IOSTREAMS_WRITE_HPP_INCLUDED |